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Shareholders' equity Schedule of Dividends Declared (Details) | 12 Months Ended
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Dec. 31, 2023 SFr / shares | Dec. 31, 2023 $ / shares | Dec. 31, 2022 SFr / shares | Dec. 31, 2022 $ / shares | Dec. 31, 2021 SFr / shares | Dec. 31, 2021 $ / shares
Switzerland, Francs |  |  |  |  |  |
Dividends Declared [Line Items] |  |  |  |  |  |
Total dividend distributions per common share | SFr / shares | SFr 3.05 |  | SFr 3.11 |  | SFr 2.88 |
United States of America, Dollars |  |  |  |  |  |
Dividends Declared [Line Items] |  |  |  |  |  |
Total dividend distributions per common share | $ / shares |  | $ 3.41 |  | $ 3.29 |  | $ 3.18

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- Definition [Line Items] for Dividends Declared [Table] + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
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