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Investment securities (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2023	Dec. 31, 2022
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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 63: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 64: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 65: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Publisher FASB
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