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Share capital - Narratives (Details) - CHF (SFr) | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of classes of share capital [line items] |  |
Issued share capital | SFr 1,797,000 | SFr 1,794,000
Number of treasury shares outstanding | 6,214,021 | 6,221,617
Common Shares [Member] |  |
Disclosure of classes of share capital [line items] |  |
Issued share capital | SFr 1,796,675 | SFr 1,794,013
Number of shares | 83,620,364 | 83,479,013

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