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Investment securities - Unrealized losses/fair value (Details 3)
SFr in Millions
Dec. 31, 2019
CHF (SFr)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]  
Fair value, less than 12 months SFr 204
Fair value, 12 months or more 0
Fair value, total 204
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]  
Gross unrealized losses, less than 12 months 2
Gross unrealized losses, 12 months or more 0
Gross unrealized losses, total 2
Corporate debt securities  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]  
Fair value, less than 12 months 204
Fair value, 12 months or more 0
Fair value, total 204
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]  
Gross unrealized losses, less than 12 months 2
Gross unrealized losses, 12 months or more 0
Gross unrealized losses, total 2
Bank  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]  
Fair value, less than 12 months 204
Fair value, 12 months or more 0
Fair value, total 204
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]  
Gross unrealized losses, less than 12 months 2
Gross unrealized losses, 12 months or more 0
Gross unrealized losses, total 2
Bank | Corporate debt securities  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]  
Fair value, less than 12 months 204
Fair value, 12 months or more 0
Fair value, total 204
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]  
Gross unrealized losses, less than 12 months 2
Gross unrealized losses, 12 months or more 0
Gross unrealized losses, total SFr 2