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Share capital - Narratives (Details) - CHF (SFr)	Dec. 31, 2022	Dec. 31, 2021
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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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The nominal value of capital issued.

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