| 
                                                
                                                
                                                    Switzerland Exports: Instruments and Watches: ow Watches (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 19,920.99
            
                                            2017
                                         | 
                                        
                                        
                                        
                                            年次
                                         | 
                                        
                                            1990 - 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Exports: Instruments and Watches: ow Jewellery (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 11,120.74
            
                                            2017
                                         | 
                                        
                                        
                                        
                                            年次
                                         | 
                                        
                                            1990 - 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Exports: Other Goods: ow Furnishings (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 727.59
            
                                            2017
                                         | 
                                        
                                        
                                        
                                            年次
                                         | 
                                        
                                            1990 - 2017
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Currency in Circulation: Banknotes and Coins (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 82,148.50
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Aug 1979 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Currency in Circulation: Banknotes: 10 CHF (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 768.37
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Aug 1979 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Currency in Circulation: Banknotes: 20 CHF (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1,772.68
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Aug 1979 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Currency in Circulation: Banknotes: 50 CHF (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 3,192.41
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Aug 1979 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Currency in Circulation: Banknotes: 100 CHF (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 13,377.85
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Aug 1979 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Currency in Circulation: Banknotes: 200 CHF (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 11,683.44
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Oct 1997 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Currency in Circulation: Banknotes: 500 CHF (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 99.05
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Aug 1979 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Currency in Circulation: Banknotes: 1000 CHF (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 48,112.34
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Aug 1979 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Official Reserve Assets: Foreign Currency Reserves in Convertibles (... (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 748,517.38
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jun 1999 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Official Reserve Assets: FC: CD: Oth National Central Banks, BIS & I... (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 26,470.87
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jun 1999 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Official Reserve Assets: FC: CD: OB: HQ in Switzerland (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 26.22
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jun 1999 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Official Reserve Assets: FC: CD: OB: HQ in Switzerland: Located Abroad (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jun 1999 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Official Reserve Assets: FC: CD: OB: HQ Outside Switzerland (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 328.55
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jun 1999 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Official Reserve Assets: FC: CD: OB: HQ Outside Switzerland: Located in Switzerl... (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jun 1999 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Foreign Currency Assets (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 491.04
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jun 1999 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Foreign Currency Assets: Securities (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Mar 2000 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Foreign Currency Assets: Deposits (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 212.96
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Mar 2000 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Foreign Currency Assets: Loans (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 204.63
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Mar 2000 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Foreign Currency Assets: Financial Derivatives (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 73.45
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Mar 2000 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Foreign Currency Assets: Gold (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Mar 2000 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Foreign Currency Assets: Others (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Mar 2000 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Monetary Base: Foreign Currency Position (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 835,028.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1975 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Monetary Base: Securities Portfolio (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 3,887.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1975 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Monetary Base: Money Market Transactions (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1975 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Monetary Base: Others (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 289,767.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1975 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Money Supply: M3: M2: M1: Deposits in Transaction Accounts (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 145,204.00
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1984 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Money Supply: M3: M2: Savings Deposits (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 343,992.00
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1984 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Money Supply: M3: Time Deposits (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 48,654.00
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1984 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Required Assets (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 16,342.23
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Required Assets: Cantonal Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 3,774.04
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Required Assets: Big Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 4,198.38
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Eligible Assets (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 468,286.48
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Eligible Assets: Cantonal Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 89,335.78
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Eligible Assets: Big Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 132,273.11
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Banknotes and Coins (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 6,133.28
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Banknotes and Coins: Cantonal Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1,553.64
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Banknotes and Coins: Big Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 812.56
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Sight Deposits with National Bank (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 462,153.21
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Sight Deposits with National Bank: Cantonal Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 87,782.14
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Minimum Reserves: Sight Deposits with National Bank: Big Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 131,460.55
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 2005 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: Gold Holdings & Gold Transactions Claim... (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 42,939.09
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: Foreign Currency Investments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 774,548.62
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: Reserve Position in the IMF (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 848.46
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: International Payment Instruments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 4,581.29
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: Monetary Assistance Loans (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 204.63
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: Claims from CHF Repo Transactions (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Apr 1998 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: Claims against Domestic Correspondents (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: CHF Securities (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 3,892.80
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Assets: Others (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 917.77
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 827,932.67
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: Banknotes in Circulation (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 79,006.02
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: Domestic Banks Sight Deposits (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 464,140.85
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: Towards the Confederation (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 28,348.93
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: Sight Deposits of Foreign Banks an... (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 50,136.24
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: Other Sight Liabilities (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 34,781.80
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: CHF Repo Transactions (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Apr 1998 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: Foreign Currency (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 33,654.82
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1998 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: Others (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 237.23
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Swiss National Bank: Liabilities: Provisions & Equity Capital (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 133,033.06
            
                                            May 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1996 - May 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Federal Money Market Debt: Yield: 3 Months (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.86
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1992 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Bond Yield: 2 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.665
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1988 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Bond Yield: 3 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.671
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1988 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Bond Yield: 4 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.612
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1988 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Bond Yield: 5 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.512
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1988 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Bond Yield: 7 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 -0.285
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1988 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Bond Yield: 20 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.381
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1988 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Bond Yield: 30 Years (% pa)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.516
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Dec 1997 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland FOREX: Interbank: CHF to UK Pound (CHF/GBP)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1.32
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1952 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland FOREX: Interbank: CHF to Japanese Yen (CHF/100 JPY)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.90
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1972 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland FOREX: Interbank: CHF to SDR (CHF/XDR)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1.40
            
                                            Jun 2018
                                         | 
                                        
                                        
                                        
                                            月次
                                         | 
                                        
                                            Jan 1978 - Jun 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Number of Active Fund: Open: Securities (単位)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 136.00
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Number of Active Fund: Open: Real Estate (単位)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 57.00
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Number of Active Fund: Open: Conventional Investmen... (単位)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 1,328.00
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Number of Active Fund: Open: Alternative Investment... (単位)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 46.00
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Net Assets: Open: Securities (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 44,147.46
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Net Assets: Open: Real Estate (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 45,333.44
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Net Assets: Open: Conventional Investments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 796,341.17
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Net Assets: Open: Alternative Investments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 8,454.09
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Newly Invested: Open: Securities (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 10,721.12
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Newly Invested: Open: Real Estate (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 500.80
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Newly Invested: Open: Conventional Investments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 57,472.86
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Newly Invested: Open: Alternative Investments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 942.05
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Reimbursed: Open: Securities (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 11,077.75
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Reimbursed: Open: Real Estate (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Reimbursed: Open: Conventional Investments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 36,616.35
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Reimbursed: Open: Alternative Investments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 142.24
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Net Assets (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 894,276.16
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Mar 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Investments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 782,395.18
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Investments: ow Shares and Other Equities (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 274,057.28
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Investments: ow Bonds (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 349,299.72
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Investments: ow Money Market Instruments (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 18,662.46
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Investments: ow Others (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 128,030.64
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Investments: ow Claims from Repo Transactio... (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 0.00
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Land and Real Estate (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 62,542.87
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Balances with Banks (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 29,885.44
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Balances with Banks: Sight and Time (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 29,174.55
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         | 
                                    
                                
                            
                                
                                    
                                        
                                            
                                            
                                            | 
                                                
                                                
                                                    Switzerland Investment Fund: Assets: Balances with Banks: Fiduciary Assets (CHF mn)
                                                
                                             | 
                                        
                                        
                                            
                                            
                
                 208.46
            
                                            Mar 2018
                                         | 
                                        
                                        
                                        
                                            四半期
                                         | 
                                        
                                            Sep 2005 - Mar 2018
                                         |