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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. |  |

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