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Assets pledged and collateral (Details) - CHF (SFr)
SFr in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2022
Assets pledged and collateral      
Total assets pledged or assigned as collateral SFr 88,721 SFr 88,721 SFr 63,111
of which encumbered 39,105 39,105 25,445
Fair value of collateral received with the right to sell or repledge 289,898 289,898 150,198
of which sold or repledged 144,747   75,819
Other information      
Cash and securities restricted under foreign banking regulations 3,868 3,868 1,247
Swiss National Bank required minimum liquidity reserves 2,246 2,246 2,258
Bank      
Assets pledged and collateral      
Total assets pledged or assigned as collateral 88,721 88,721 63,111
of which encumbered 39,105 39,105 25,445
Fair value of collateral received with the right to sell or repledge 289,898 289,898 150,198
of which sold or repledged   144,747 75,819
Other information      
Cash and securities restricted under foreign banking regulations 3,423 3,423 812
Swiss National Bank required minimum liquidity reserves SFr 2,246 SFr 2,246 SFr 2,258