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Right-of-use assets - Narrative (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]    
Additions SFr 43.4 SFr 168.0
Lease modification (45.5) 3.8
Storage    
Disclosure of quantitative information about right-of-use assets [line items]    
Additions 0.0 68.4
Lease modification SFr (52.4) SFr 0.0