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Assets pledged and collateral (Details) - CHF (SFr)
SFr in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Assets pledged and collateral    
Total assets pledged or assigned as collateral SFr 63,111 SFr 105,835
of which encumbered 25,445 8,430
Fair value of collateral received with the right to sell or repledge 150,198 74,354
of which sold or repledged 75,819 23,374
Other information    
Cash and securities restricted under foreign banking regulations 812 424
Swiss National Bank required minimum liquidity reserves SFr 2,258 SFr 2,041