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Revenue from contracts with customers (Details 2) - CHF (SFr)
SFr in Millions
3 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Contract balances [Line Items]          
Accounts Receivable, Net SFr 687       SFr 865
Contract with Customer, Liability 54       55
Contract with Customer, Liability, Revenue Recognized 8 SFr 11 SFr 10 SFr 14  
Bank          
Contract balances [Line Items]          
Accounts Receivable, Net 686       865
Contract with Customer, Liability 54       SFr 55
Contract with Customer, Liability, Revenue Recognized SFr 8 SFr 11 SFr 10 SFr 14