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CECL - Financial instruments measured at amortized cost and credit losses (Details) - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Overview of financial instruments measured at amortized cost, by balance sheet position [Line Items] |  |  |  |  |
Cash and due from banks, Amortized cost basis | SFr 124,946 |  | SFr 67,548 |  |
Cash and due from banks, Allowance for credit losses | (108) |  | 0 |  |
Cash and due from banks, Net carrying value | 124,838 |  | 67,548 |  |
Interest-bearing deposits with banks, Amortized cost basis | 383 |  | 373 |  |
Interest-bearing deposits with banks, Allowance for credit losses | 0 |  | 0 |  |
Interest-bearing deposits with banks, Net carrying value | 383 |  | 373 |  |
Securities purchased under resale agreements and securities borrowing transactions, Amortized cost basis | 20,976 |  | 18,005 |  |
Securities purchased under resale agreements and securities borrowing transactions, Allowance for credit losses | (0) |  | (0) |  |
Securities purchased under resale agreements and securities borrowing transactions, Net carrying value | 20,976 |  | 18,005 |  |
Debt securities held-to-maturity, Amortized cost basis | 1,417 |  | 921 |  |
Debt securities held-to-maturity, Allowance for credit losses | 0 |  | 0 |  |
Debt securities held-to-maturity, Net carrying value | 1,417 |  | 921 |  |
Loans, Amortized cost basis | 215,963 |  | 262,108 |  |
Allowance for credit losses | (1,680) | SFr (1,366) | (1,362) | SFr (1,296) | SFr (1,535)
Loans, Net carrying value | 214,283 |  | 260,746 |  |
Brokerage receivables, Amortized cost basis | 2,216 |  | 17,899 |  |
Brokerage receivables, Allowance for credit losses | 0 |  | (4,081) |  |
Brokerage receivables, Net carrying value | 2,216 |  | 13,818 |  |
Other assets, Amortized cost basis | 22,991 |  | 23,521 |  |
Other assets, Allowance for credit losses | (53) |  | (37) |  |
Other assets, Net carrying value | 22,938 |  | 23,484 |  |
Total, Amortized cost basis | 388,892 |  | 390,375 |  |
Total, Allowance for credit losses | (1,841) |  | (5,480) |  |
Total, Net carrying value | SFr 387,051 |  | SFr 384,895 |  |

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