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Related parties - Schedule of Transactions (Details)
SFr in Millions
12 Months Ended
Dec. 31, 2024
CHF (SFr)
executiveMember
Dec. 31, 2023
CHF (SFr)
Dec. 31, 2022
CHF (SFr)
Related party transactions [abstract]      
Number of executive members | executiveMember 5    
Short-term employee benefits SFr 3.4 SFr 4.2 SFr 2.1
Post-employment benefits 1.1 0.3 1.8
Share-based compensation 13.8 13.8 15.1
On Executive Team SFr 18.2 SFr 18.3 SFr 19.0