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Investment securities (Details) - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Investment securities disclosures |  |
Debt securities held-to-maturity, Net carrying value | SFr 1,417 | SFr 921
Available-for-sale Securities, Debt Securities | 4 | 796
Total investment securities | SFr 1,421 | SFr 1,717

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