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Investment securities by type (Details 2) - CHF (SFr)
SFr in Millions
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Held-to-maturity securities      
Debt securities held-to-maturity SFr (0)   SFr 0
Debt securities held-to-maturity, before allowance for credit losses 95    
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Fair value 95   0
Available-for-sale securities      
Amortized cost, Debt Securities     972
Amortized cost, before allowance for credit losses, Debt Securities 483    
Gross unrealized gains, Debt securities 6   36
Gross unrealized losses, Debt securities 0   2
Fair value, Debt securities 489 SFr 1,068 1,006
Debt securities issued by the Swiss federal, cantonal or local government entities      
Available-for-sale securities      
Amortized cost, Debt Securities     2
Amortized cost, before allowance for credit losses, Debt Securities 2    
Gross unrealized gains, Debt securities 0   0
Gross unrealized losses, Debt securities 0   0
Fair value, Debt securities 2   2
Debt securities issued by foreign governments      
Available-for-sale securities      
Amortized cost, Debt Securities     163
Amortized cost, before allowance for credit losses, Debt Securities 0    
Gross unrealized gains, Debt securities 0   8
Gross unrealized losses, Debt securities 0   0
Fair value, Debt securities 0   171
Corporate debt securities      
Held-to-maturity securities      
Debt securities held-to-maturity     0
Debt securities held-to-maturity, before allowance for credit losses 95    
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Fair value 95   0
Available-for-sale securities      
Amortized cost, Debt Securities     807
Amortized cost, before allowance for credit losses, Debt Securities 481    
Gross unrealized gains, Debt securities 6   28
Gross unrealized losses, Debt securities 0   2
Fair value, Debt securities 487   833
Bank      
Held-to-maturity securities      
Debt securities held-to-maturity (0)   0
Debt securities held-to-maturity, before allowance for credit losses 95    
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Fair value 95   0
Available-for-sale securities      
Amortized cost, Debt Securities     970
Amortized cost, before allowance for credit losses, Debt Securities 481    
Gross unrealized gains, Debt securities 6   36
Gross unrealized losses, Debt securities 0   2
Fair value, Debt securities 487   1,004
Bank | Debt securities issued by foreign governments      
Available-for-sale securities      
Amortized cost, Debt Securities     163
Amortized cost, before allowance for credit losses, Debt Securities 0    
Gross unrealized gains, Debt securities 0   8
Gross unrealized losses, Debt securities 0   0
Fair value, Debt securities 0   171
Bank | Corporate debt securities      
Held-to-maturity securities      
Debt securities held-to-maturity     0
Debt securities held-to-maturity, before allowance for credit losses 95    
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Fair value 95   0
Available-for-sale securities      
Amortized cost, Debt Securities     807
Amortized cost, before allowance for credit losses, Debt Securities 481    
Gross unrealized gains, Debt securities 6   28
Gross unrealized losses, Debt securities 0   2
Fair value, Debt securities SFr 487   SFr 833