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CECL (Details 8) - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Financial Asset, Past Due [Member] |  |
Debt Securities Held-To-Maturity, Amortized Cost, Past Due [Line Items] |  |
Total debt securities held-to-maturity, amortized cost | SFr 0 | SFr 0

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