| 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Other Accounts Receivable: Dep... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Depo... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Other Accounts Receivable: Oth... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Insurance, Pension & Stan... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Insurance, Pension & Stan... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Other Accounts Payable: O... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Official Reserve Assets: Others: Securities: Equ... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Insurance, Pension & Standardi... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Currency & Deposits: Deposit T... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Other Accounts Payable: D... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Cent... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Trade Credit & Advances: ... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Insurance, Pension & Stan... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Other Accounts Payable: D... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Gene... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Insurance, Pension & Standardi... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Other Equity (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Trade Credit & Advances: ... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Insurance, Pension & Standardi... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Trade Credit & Advances: Other... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Trade Credit & Advances: ... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Other Accounts Receivable: Dep... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Other Accounts Receivable: Oth... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Equity: Central Bank (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Currency & Deposits: Central B... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Trade Credit & Advances: Centr... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Currency & Deposits: Other Sec... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Other Accounts Payable: D... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Trade Credit & Advances: Depos... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Cent... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Trade Credit & Advances: ... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Trade Credit & Advances: ... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Cent... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Insurance, Pension & Standardi... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: Central B... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Official Reserve Assets: Others: Currency & Depo... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 16,987.70
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1995 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Official Reserve Assets: Others (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 126,823.48
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Other Accounts Receivable: Oth... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 15,315.79
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Other Accounts Receivable: Oth... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 15,365.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Other Accounts Receivable: Gen... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 8,941.71
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Other Accounts Receivable (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 24,306.71
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Loans: Other Sectors: Sho... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,291,754.07
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Loans: Other Sectors: Lon... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 44,177.01
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Loans: Other Sectors (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,335,931.09
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Loans: General Government... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 12,205.38
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Loans: General Government (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 28,513.91
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Loans (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,364,445.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Loans: Other Sectors: Short Te... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 581,173.04
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Loans: Other Sectors: Long Ter... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 34,245.38
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Loans: Other Sectors (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 615,418.42
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Loans: Deposit Taking Corporat... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Loans: Deposit Taking Corporat... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1992 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Loans: Deposit Taking Corporat... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Loans (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2,281,655.55
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits: Depo... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment: Currency & Deposits (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4,227,315.78
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Currency & Deposits: Other Sec... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 967,812.27
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Currency & Deposits: Deposit T... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment: Currency & Deposits (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 3,786,826.63
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Other Investment (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 5,640,431.96
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Other Investment (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 6,100,860.19
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Financial Derivatives & Employee Stock Opti... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2,737,030.20
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Financial Derivatives & Employee Stock Options (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2,824,315.55
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 50,859.04
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 960,733.71
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Othe... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,011,592.75
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Gene... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 46,499.97
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Gene... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 777,339.41
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Gene... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 823,839.38
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Depo... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Depo... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities: Depo... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Debt Securities (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2,680,050.19
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: Other Sec... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 133,949.85
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Sep 1986 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: Other Sec... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 728,495.38
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: Other Sec... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 862,445.23
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: General G... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 416.22
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: General G... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -4.22
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: General G... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 412.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1999 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: Deposit T... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: Deposit T... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities: Deposit T... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Debt Securities (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,396,652.86
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Equity: Other Sectors (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,947,966.31
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Equity: Deposit Takin... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.00
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment: Equity (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,947,966.31
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Equity: Other Sectors (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2,052,353.26
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Equity: Deposit Taking Cor... (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 187,020.76
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment: Equity (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2,239,674.94
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Portfolio Investment (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4,628,016.50
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Portfolio Investment (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 3,636,327.80
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1984 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Direct Investment: Debt Instruments (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 700,157.24
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Direct Investment: Debt Instruments (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 404,148.60
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Liabilities: Direct Investment: Equity (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,613,611.96
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United Kingdom UK: IIP: Assets: Direct Investment: Equity (USD mn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,826,863.05
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Mar 1987 - Mar 2018
                                     |