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Pension and other post-retirement benefits - Contributions (Details 7) - CHF (SFr) SFr in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Contribution Pension and Other Postretirement Plans Disclosure |  |  |
Contributions made by the Entity to defined contribution pension plans | SFr 415 | SFr 426 | SFr 483

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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