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Other investments (Details) - CHF (SFr) SFr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other investments |  |  |
Other investments | SFr 4,017 | SFr 5,463 |
Accumulated depreciation, real estate held for investment | 25 | 24 | SFr 28
Impairment charges | 0 | 0 | SFr 0
Foreclosed or Repossessed, Real Estate [Member] |  |  |
Other investments |  |  |
Other investments | 6 | 20 |
Equity method investments |  |  |
Other investments |  |  |
Other investments | 1,856 | 1,618 |
Equity securities (without a readily determinable fair value) |  |  |
Other investments |  |  |
Other investments | 1,691 | 3,212 |
of which at net asset value |  |  |
Other investments |  |  |
Other investments | 101 | 72 |
of which at measurement alternative |  |  |
Other investments |  |  |
Other investments | 49 | 366 |
of which at fair value |  |  |
Other investments |  |  |
Other investments | 1,503 | 2,727 |
of which at cost less impairment |  |  |
Other investments |  |  |
Other investments | 38 | 47 |
Real estate held for investment |  |  |
Other investments |  |  |
Other investments | 31 | 46 |
Real estate held for investment | Foreclosed or Repossessed, Real Estate [Member] |  |  |
Other investments |  |  |
Other investments | 6 | 20 |
Life finance instruments |  |  |
Other investments |  |  |
Other investments | SFr 439 | SFr 587 |

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-2 + Details
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- Definition Amount of investments classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column F)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479438/970-360-S99-1 + Details
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