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Investment securities - Unrealized losses/fair value (Details 3) SFr in Millions | Dec. 31, 2022 CHF (SFr)
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Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |
Fair value, less than 12 months | SFr 374
Fair value, 12 months or more | 404
Fair value, total | 778
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |
Gross unrealized losses, less than 12 months | 58
Gross unrealized losses, 12 months or more | 98
Gross unrealized losses, total | 156
Corporate debt securities |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |
Fair value, less than 12 months | 374
Fair value, 12 months or more | 404
Fair value, total | 778
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |
Gross unrealized losses, less than 12 months | 58
Gross unrealized losses, 12 months or more | 98
Gross unrealized losses, total | SFr 156

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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