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CECL - Financial instruments measured at amortized cost and credit losses (Details) - CHF (SFr) SFr in Millions | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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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 100,001 |  | SFr 67,548 |  |
Cash and due from banks, Allowance for credit losses | (4) |  | 0 |  |
Cash and due from banks, Net carrying value | 99,997 |  | 67,548 |  |
Interest-bearing deposits with banks, Amortized cost basis | 323 |  | 373 |  |
Interest-bearing deposits with banks, Allowance for credit losses | 0 |  | 0 |  |
Interest-bearing deposits with banks, Net carrying value | 323 |  | 373 |  |
Securities purchased under resale agreements and securities borrowing transactions, Amortized cost basis | 21,086 |  | 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 | 21,086 |  | 18,005 |  |
Debt securities held-to-maturity, Amortized cost basis | 1,498 |  | 921 |  |
Debt securities held-to-maturity, Allowance for credit losses | 0 |  | 0 |  |
Debt securities held-to-maturity, Net carrying value | 1,498 |  | 921 |  |
Loans, Amortized cost basis | 248,253 |  | 262,108 |  |
Allowance for credit losses | (1,522) | SFr (1,366) | (1,362) | SFr (1,359) | SFr (1,296)
Loans, Net carrying value | 246,731 |  | 260,746 |  |
Brokerage receivables, Amortized cost basis | 4,005 |  | 17,899 |  |
Brokerage receivables, Allowance for credit losses | 0 |  | (4,081) |  |
Brokerage receivables, Net carrying value | 4,005 |  | 13,818 |  |
Other assets, Amortized cost basis | 15,848 |  | 23,521 |  |
Other assets, Allowance for credit losses | (39) |  | (37) |  |
Other assets, Net carrying value | 15,809 |  | 23,484 |  |
Total, Amortized cost basis | 391,014 |  | 390,375 |  |
Total, Allowance for credit losses | (1,565) |  | (5,480) |  |
Total, Net carrying value | SFr 389,449 |  | SFr 384,895 |  |

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