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Investment securities - Maturities of amortized costs/FV/Avg yield (Details 6) - CHF (SFr) SFr in Millions | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Due within 1 year, amortized cost | SFr 25 |  |
Due from 1 to 5 years, amortized cost | 90 |  |
Due from 5 to 10 years, amortized cost | 736 |  |
Total, amortized cost, before allowance for credit losses | 851 |  | SFr 1,013
Due within 1 year, fair value | 25 |  |
Due from 1 to 5 years, fair value | 83 |  |
Due from 5 to 10 years, fair value | 631 |  |
Total, fair value | SFr 739 | SFr 809 | 1,005
Due within 1 year, average yield (as a percent) | 0.67% |  |
Due from 1 to 5 years, average yield (as a percent) | (0.02%) |  |
Due from 5 to 10 years, average yield (as a percent) | 0.05% |  |
Total, average yield (as a percent) | 0.06% |  |
Bank |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Due within 1 year, amortized cost | SFr 23 |  |
Due from 1 to 5 years, amortized cost | 90 |  |
Due from 5 to 10 years, amortized cost | 736 |  |
Total, amortized cost, before allowance for credit losses | 849 |  | 1,011
Due within 1 year, fair value | 23 |  |
Due from 1 to 5 years, fair value | 83 |  |
Due from 5 to 10 years, fair value | 631 |  |
Total, fair value | SFr 737 |  | SFr 1,003
Due within 1 year, average yield (as a percent) | 0.43% |  |
Due from 1 to 5 years, average yield (as a percent) | (0.02%) |  |
Due from 5 to 10 years, average yield (as a percent) | 0.05% |  |
Total, average yield (as a percent) | 0.05% |  |

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