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Investment securities by type (Details 2) - CHF (SFr) SFr in Millions | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Available-for-sale securities |  |  |
Amortized cost, before allowance for credit losses, Debt Securities | SFr 851 |  | SFr 1,013
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |
Gross unrealized gains, Debt securities | 0 |  | 0
Gross unrealized losses, Debt securities | 112 |  | 8
Fair value, Debt securities | 739 | SFr 809 | 1,005
Debt securities issued by the Swiss federal, cantonal or local government entities |  |  |
Available-for-sale securities |  |  |
Amortized cost, before allowance for credit losses, Debt Securities | 2 |  | 2
Gross unrealized gains, Debt securities | 0 |  | 0
Gross unrealized losses, Debt securities | 0 |  | 0
Fair value, Debt securities | 2 |  | 2
Corporate debt securities |  |  |
Available-for-sale securities |  |  |
Amortized cost, before allowance for credit losses, Debt Securities | 849 |  | 1,011
Gross unrealized gains, Debt securities | 0 |  | 0
Gross unrealized losses, Debt securities | 112 |  | 8
Fair value, Debt securities | 737 |  | 1,003
Bank |  |  |
Available-for-sale securities |  |  |
Amortized cost, before allowance for credit losses, Debt Securities | 849 |  | 1,011
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |
Gross unrealized gains, Debt securities | 0 |  | 0
Gross unrealized losses, Debt securities | 112 |  | 8
Fair value, Debt securities | 737 |  | 1,003
Bank | Corporate debt securities |  |  |
Available-for-sale securities |  |  |
Amortized cost, before allowance for credit losses, Debt Securities | 849 |  | 1,011
Gross unrealized gains, Debt securities | 0 |  | 0
Gross unrealized losses, Debt securities | 112 |  | 8
Fair value, Debt securities | SFr 737 |  | SFr 1,003

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