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Investment securities by type (Details 2) - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Held-to-maturity securities |  |
Debt securities held-to-maturity | SFr (0) | SFr (0)
Debt securities held-to-maturity, before allowance for credit losses | 1,417 | 921
Accrued interest excluded from amortized cost base of total Debt securities held-to-maturity | 19 | 10
Gross unrealized gains | 0 | 0
Gross unrealized losses | 117 | 40
Fair value | 1,300 | 881
Available-for-sale securities |  |
Amortized cost, before allowance for credit losses, Debt Securities | 4 | 952
Debt Securities, Available-for-sale, Allowance for Credit Loss | (0) | (0)
Gross unrealized gains, Debt securities | 0 | 0
Gross unrealized losses, Debt securities | 0 | 156
Fair value, Debt securities | 4 | 796
Debt Securities Available-for-Sale Financing Receivable, Accrued Interest, Before Allowance for Credit Loss | 0 | 1
Debt securities issued by foreign governments |  |
Held-to-maturity securities |  |
Debt securities held-to-maturity | (0) | (0)
Debt securities held-to-maturity, before allowance for credit losses | 1,259 | 921
Gross unrealized gains | 0 | 0
Gross unrealized losses | 110 | 40
Fair value | 1,149 | 881
Corporate debt securities |  |
Held-to-maturity securities |  |
Debt securities held-to-maturity | (0) | (0)
Debt securities held-to-maturity, before allowance for credit losses | 158 | 0
Gross unrealized gains | 0 | 0
Gross unrealized losses | 7 | 0
Fair value | 151 | 0
Available-for-sale securities |  |
Amortized cost, before allowance for credit losses, Debt Securities | 4 | 952
Debt Securities, Available-for-sale, Allowance for Credit Loss | (0) | (0)
Gross unrealized gains, Debt securities | 0 | 0
Gross unrealized losses, Debt securities | 0 | 156
Fair value, Debt securities | SFr 4 | SFr 796

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