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CECL - Financial instruments measured at amortized cost and credit losses (Details) - CHF (SFr) SFr in Millions | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 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 159,307 |  | SFr 164,510 |  |  |
Cash and due from banks, Allowance for credit losses | 0 |  | 0 |  |  |
Cash and due from banks, Net carrying value | 159,307 |  | 164,510 |  |  |
Interest-bearing deposits with banks, Amortized cost basis | 856 |  | 1,323 |  |  |
Interest-bearing deposits with banks, Allowance for credit losses | (5) |  | 0 |  |  |
Interest-bearing deposits with banks, Net carrying value | 851 |  | 1,323 |  |  |
Securities purchased under resale agreements and securities borrowing transactions, Amortized cost basis | 21,764 |  | 35,283 |  |  |
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 | 21,764 |  | 35,283 |  |  |
Loans, Amortized cost basis | 277,834 |  | 282,740 |  |  |
Allowance for credit losses | (1,360) | SFr (1,330) | (1,297) | SFr (1,412) | SFr (1,527) | SFr (1,536)
Loans, Net carrying value | 276,474 |  | 281,443 |  |  |
Brokerage receivables, Amortized cost basis | 19,275 |  | 20,873 |  |  |
Brokerage receivables, Allowance for credit losses | (4,215) | (4,069) | (4,186) |  |  |
Brokerage receivables, Net carrying value | 15,060 |  | 16,687 |  |  |
Other assets, Amortized cost basis | 16,375 |  | 14,175 |  |  |
Other assets, Allowance for credit losses | (31) | SFr (30) | (30) |  |  |
Other assets, Net carrying value | 16,344 |  | 14,145 |  |  |
Total, Amortized cost basis | 495,411 |  | 518,904 |  |  |
Total, Allowance for credit losses | (5,611) |  | (5,513) |  |  |
Total, Net carrying value | 489,800 |  | 513,391 |  |  |
Bank |  |  |  |  |  |
Overview of financial instruments measured at amortized cost, by balance sheet position [Line Items] |  |  |  |  |  |
Cash and due from banks, Amortized cost basis | 158,535 |  | 163,718 |  |  |
Cash and due from banks, Allowance for credit losses | 0 |  | 0 |  |  |
Cash and due from banks, Net carrying value | 158,535 |  | 163,718 |  |  |
Interest-bearing deposits with banks, Amortized cost basis | 785 |  | 1,256 |  |  |
Interest-bearing deposits with banks, Allowance for credit losses | (5) |  | 0 |  |  |
Interest-bearing deposits with banks, Net carrying value | 780 |  | 1,256 |  |  |
Securities purchased under resale agreements and securities borrowing transactions, Amortized cost basis | 21,764 |  | 35,283 |  |  |
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 | 21,764 |  | 35,283 |  |  |
Loans, Amortized cost basis | 286,265 |  | 291,411 |  |  |
Allowance for credit losses | (1,359) |  | (1,296) | SFr (1,411) |  | SFr (1,535)
Loans, Net carrying value | 284,906 |  | 290,115 |  |  |
Brokerage receivables, Amortized cost basis | 19,277 |  | 20,875 |  |  |
Brokerage receivables, Allowance for credit losses | (4,215) |  | (4,186) |  |  |
Brokerage receivables, Net carrying value | 15,062 |  | 16,689 |  |  |
Other assets, Amortized cost basis | 16,462 |  | 14,226 |  |  |
Other assets, Allowance for credit losses | (29) |  | (28) |  |  |
Other assets, Net carrying value | 16,433 |  | 14,198 |  |  |
Total, Amortized cost basis | 503,088 |  | 526,769 |  |  |
Total, Allowance for credit losses | (5,608) |  | (5,510) |  |  |
Total, Net carrying value | SFr 497,480 |  | SFr 521,259 |  |  |

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