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CECL (Details 9) - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Other financial assets held at amortized cost, past due | SFr 0 | SFr 0
Other financial assets held at amortized cost, total | SFr 1,271 | SFr 1,765

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