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Leases (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income and Expenses, Lessee [Abstract]      
Operating lease costs SFr 370 SFr 279 SFr 293
Variable lease costs 42 46 50
Sublease income (51) (65) (75)
Total lease costs 361 260 268
Other information pertaining to leases [Abstract]      
Gains/(losses) on sale and leaseback transactions 0 336 225
Cash paid for amounts included in the measurement of operating lease liabilities recorded in operating cash flows (344) (336) (334)
Right-of-use assets obtained in exchange of new operating lease liabilities 35 165 107
Changes to right-of-use assets due to lease modifications for operating leases SFr (1) SFr 74 SFr 29
Weighted average remaining lease term and discount rate [Abstract]      
Remaining lease term (years) 8 years 8 months 12 days 9 years 2 months 12 days  
Discount rate 3.30% 3.00%  
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]      
Due within 1 year SFr 247 SFr 312  
Due between 1 and 2 years 236 260  
Due between 2 and 3 years 215 236  
Due between 3 and 4 years 171 219  
Due between 4 and 5 years 139 186  
Thereafter 638 811  
Total 1,646 2,024  
Future interest payable (226) (275)  
Lease liabilities SFr 1,420 SFr 1,749  
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities  
Operating Leases, Future Minimum Payments Due [Abstract]      
Sale Leaseback Transaction, Lease Terms During 2023, the Bank had no sale-leaseback transactions. During 2022, the Bank entered into 12 sale-leaseback transactions with lease terms ranging from 5 to 10 years. During 2021, the Bank entered into 13 sale-leaseback transaction with lease terms ranging from 3 to 10 years.