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Other investments (Details 2) - CHF (SFr) SFr in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other investments |  |  |
Impairments and downward adjustments | SFr (66) |  |
Impairments and downward adjustments, Annual Amount | (14) | SFr (12) |
Upward adjustments | 147 |  |
Upward adjustments, Annual Amount | 0 | 9 |
Other Revenue, Other Investments | SFr (660) | SFr (38) | SFr 256

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- 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. This element represents information relating to other investments. + References No definition available. + Details
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- Definition This item represents the revenues from other investments which are not included in another category or item, including realized gains and losses from the sale of other investments, impairment losses and unrealized gains or losses on other investment accounted for under the fair value option. + References No definition available. + Details
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- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of cumulative impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-3 + Details
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