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Derivatives and hedging activities (Details 6) - CHF (SFr) SFr in Billions | Dec. 31, 2023 | Dec. 31, 2022
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Hedged items in fair value hedges [Line Items] |  |
Hedged Liability, Fair Value Hedge | SFr 64.1 | SFr 72.0
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Long-term Debt | Long-term Debt
Investment securities |  |
Hedged items in fair value hedges [Line Items] |  |
Hedged Asset, Fair Value Hedge | SFr 0.0 | SFr 0.8
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Debt Securities, Available-for-sale and Held-to-maturity | Debt Securities, Available-for-sale and Held-to-maturity
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | SFr 0.0 | SFr (0.1)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | 0.0 | 0.0
Long-term debt |  |
Hedged items in fair value hedges [Line Items] |  |
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | 0.6 | (1.0)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | (3.7) | (4.4)
Net loans |  |
Hedged items in fair value hedges [Line Items] |  |
Hedged Asset, Fair Value Hedge | SFr 40.8 | SFr 29.0
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Financing Receivable and Fair value Loans, Net Reported amount | Financing Receivable and Fair value Loans, Net Reported amount
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | SFr 0.8 | SFr (1.3)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | SFr (1.6) | SFr (0.7)

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