| 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Loans: General Govt (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 124.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Loans: General Govt: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 124.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Loans: Other Resident Sectors (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 39,106.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Loans: Other Resident Sectors: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 34,077.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 84,261.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 82,015.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares: MFIs (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 5,007.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares: MFIs: ow in E... (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 4,762.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares: MFIs: ow Up t... (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 242.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares: General Govt (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 65,098.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares: General Govt:... (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 64,837.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares: Other Residen... (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 14,156.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Securities Other than Shares: Other Residen... (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 12,415.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Money Market Fund Shares (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1,065.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Other Euro Area: Shares and Other Equity (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 34,043.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Rest of the World: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 86,239.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Sep 1997 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Rest of the World: Loans (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 98,084.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Rest of the World: Loans: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 32,784.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Sep 1997 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Rest of the World: Securities Other than Shares (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 107,086.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Rest of the World: Securities Other than Shares: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 53,456.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Sep 1997 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Rest of the World: Shares and Other Equity (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 77,002.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Not Allocated (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 428,956.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Securities Other than Shares (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 860,095.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Money Market Fund Shares (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 2,868.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Assets: Shares and Other Equity (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 194,892.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1,862,984.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1,836,597.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: MFIs (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 440,205.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: MFIs: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 435,790.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Central General Govt (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 42,567.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Other General Govt (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 48,842.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Other General Govt: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 48,838.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Other General Govt: Overnight (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 43,465.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Other General Govt: Agreed Maturity (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 5,273.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Other General Govt: Agreed Maturity... (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 4,458.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Other General Govt: Redeemable at N... (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Other General Govt: Repo (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 104.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Domestic: Deposits: Other Resident Sectors (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1,325,180.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Other Euro Area (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 552,853.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Rest of the World (RW) (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 110,172.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: RW: Deposits (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 110,134.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: RW: Deposits: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 67,355.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Sep 1997 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: RW: Deposits: Overnight: Agreed Maturity & Redeemable a... (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 89,505.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: RW: Deposits: Overnight: AR: ow Up to 2 Years (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 65,112.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1998 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: RW: Deposits: Repo (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 20,629.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1998 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Not Allocated (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 888,832.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Not Allocated: ow Up to 2 Years (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 30,050.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Not Allocated: ow Debt Securities Issued (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 227,089.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Not Allocated: ow Debt Securities Issued: ow in Euro (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 198,241.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Not Allocated: ow Other Liabilities (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 204,485.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Notes and Coins (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 139,857.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain MFIs: Liabilities: Money Market Fund Shares (EUR mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 6,378.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: Up to 3 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.39
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Mar 1988 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: 3-6 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.40
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: 6 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.37
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: 6-12 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.35
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: 12 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.34
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: Over 12 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1.09
            
                                            Jun 2013
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1993 - Jun 2013
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: Between Holders: Up ... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.48
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Mar 1988 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: Between Holders: 3-6... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.43
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: Between Holders: 6 M... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.43
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: Between Holders: 6-1... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.39
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: Between Holders: 12 ... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.36
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Outright Spot: Between Holders: Ove... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1.12
            
                                            Jun 2013
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1993 - Jun 2013
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Spot Sell/Buy Back (SB): Overnight (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.43
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: 1 Week (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.37
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: 1 Month (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.40
            
                                            Aug 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Aug 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: 3 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.38
            
                                            Jul 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jul 1993 - Jul 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: 6 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.18
            
                                            Nov 2015
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Sep 1993 - Nov 2015
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: Between Holders: Overnight (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.43
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: Between Holders: 1 Week (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.37
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: Between Holders: 1 Month (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.40
            
                                            Aug 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Aug 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: Between Holders: 3 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.38
            
                                            Jul 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Apr 1994 - Jul 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: SB: Between Holders: 6 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.18
            
                                            Nov 2015
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Sep 1996 - Nov 2015
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Repo: Overnight (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.40
            
                                            Jul 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Jul 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Repo: 1 Week (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.36
            
                                            Jul 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Jul 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Repo: 1 Month (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            Apr 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Apr 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Treasury Bills Rate: Secondary Market: Repo: 3 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            Apr 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Apr 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: 3 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.03
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: 5 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.30
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Sep 1988 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: 10 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1.61
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1989 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: 15 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 2.06
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1993 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: 30 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 2.87
            
                                            Oct 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1998 - Oct 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: Between Holders: 3 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.05
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: Between Holders: 5 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.41
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Sep 1988 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: Between Holders: 10 Year... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1.39
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jul 1989 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: Between Holders: 15 Year... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1.89
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1993 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Outright Spot: Between Holders: 30 Year... (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 2.59
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1998 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Spot Sell/Buy Back (SB): Overnight (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.46
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: 1 Week (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.46
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: 1 Month (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.46
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: 3 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.45
            
                                            Aug 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1988 - Aug 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: 6 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.45
            
                                            Aug 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1989 - Aug 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: Between Holders: Overnight (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.46
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: Between Holders: 1 Week (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.43
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: Between Holders: 1 Month (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.46
            
                                            Sep 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1988 - Sep 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: Between Holders: 3 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.55
            
                                            Aug 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Dec 1988 - Aug 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: SB: Between Holders: 6 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.45
            
                                            Aug 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1989 - Aug 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Repo: Overnight (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.36
            
                                            Jul 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Jul 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Spain Govt Bonds Rate: Secondary Market: Repo: 1 Week (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.38
            
                                            Jul 2017
                                         | 
                                        
                                        
                                        
                                            monthly
                                         | 
                                        
                                            Jan 1988 - Jul 2017
                                         |