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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