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Pension and other post-retirement benefits - Contributions (Details 7) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Contribution Pension and Other Postretirement Plans Disclosure      
Contributions made by the Entity to defined contribution pension plans SFr 241 SFr 263 SFr 299
Switzerland      
Defined Contribution Pension and Other Postretirement Plans Disclosure      
Contributions made by the Entity to defined contribution pension plans 81 100 143
Bank      
Defined Contribution Pension and Other Postretirement Plans Disclosure      
Contributions made by the Entity to defined contribution pension plans 211 235 240
Contributions made by the Entity to the group defined benefit plan 215 248 249
Bank | Switzerland      
Defined Contribution Pension and Other Postretirement Plans Disclosure      
Contributions made by the Entity to defined contribution pension plans SFr 69 SFr 89 SFr 96