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Investment securities - Allowance for credit loss (Details 7) SFr in Millions | Dec. 31, 2023 CHF (SFr)
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Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | SFr (0)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | (0)
Corporate debt securities |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | (0)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | SFr (0)

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Period Type: | duration

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- Details
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Balance Type: |
Period Type: |