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CECL (Details 5) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt securities issued by foreign governments
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Purchases	SFr 463	SFr 971
Corporate debt securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Purchases	SFr 168

X

- Definition

Amount of increase from purchase of debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-11

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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X

- Details

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