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Investment securities - Unrealized losses/fair value (Details 3) - CHF (SFr) SFr in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | SFr 625 | SFr 683
Fair value, 12 months or more | 89 | 0
Fair value, total | 714 | 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross unrealized losses, less than 12 months | 100 | 8
Gross unrealized losses, 12 months or more | 12 | 0
Gross unrealized losses, total | 112 | 8
Corporate debt securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 625 | 683
Fair value, 12 months or more | 89 | 0
Fair value, total | 714 | 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross unrealized losses, less than 12 months | 100 | 8
Gross unrealized losses, 12 months or more | 12 | 0
Gross unrealized losses, total | 112 | 8
Bank |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 625 | 683
Fair value, 12 months or more | 89 | 0
Fair value, total | 714 | 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross unrealized losses, less than 12 months | 100 | 8
Gross unrealized losses, 12 months or more | 12 | 0
Gross unrealized losses, total | 112 | 8
Bank | Corporate debt securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 625 | 683
Fair value, 12 months or more | 89 | 0
Fair value, total | 714 | 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross unrealized losses, less than 12 months | 100 | 8
Gross unrealized losses, 12 months or more | 12 | 0
Gross unrealized losses, total | SFr 112 | SFr 8

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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