Assets pledged and collateral (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Assets pledged and collateral    
Total assets pledged or assigned as collateral SFr 88,721 SFr 141,826
of which encumbered 39,105 80,428
Fair value of collateral received with the right to sell or repledge 289,898 414,268
of which sold or repledged 144,747 215,601
Other information    
Cash and securities restricted under foreign banking regulations 3,868 4,089
Swiss National Bank required minimum liquidity reserves 2,246 2,092
Bank    
Assets pledged and collateral    
Total assets pledged or assigned as collateral 88,721 141,826
of which encumbered 39,105 80,428
Fair value of collateral received with the right to sell or repledge 289,898 414,268
of which sold or repledged 144,747 215,601
Other information    
Cash and securities restricted under foreign banking regulations 3,423 3,465
Swiss National Bank required minimum liquidity reserves SFr 2,246 SFr 2,092