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Shareholders' equity Dividends Declared (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 SFr / shares | Jun. 30, 2025 $ / shares | Jun. 30, 2024 SFr / shares | Jun. 30, 2024 $ / shares | Jun. 30, 2025 SFr / shares | Jun. 30, 2025 $ / shares | Jun. 30, 2024 SFr / shares | Jun. 30, 2024 $ / shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | (per share) | SFr 0.81 | $ 0.97 | SFr 0.82 | $ 0.91 | SFr 1.62 | $ 1.88 | SFr 1.57 | $ 1.77

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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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- 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. + References No definition available. + Details
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