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Share capital - Narrative (Details) - CHF (SFr)
SFr / shares in Units, SFr in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]      
Share capital SFr 33.5 SFr 33.5  
Share capital, paid-in percentage 100.00%    
Sale of treasury shares related to share-based compensation SFr 26.4 0.5 SFr 0.0
Sale of treasury shares 28.4 0.7  
Treasury shares      
Disclosure of classes of share capital [line items]      
Sale of treasury shares SFr 0.5 SFr 0.2  
Class A shares      
Disclosure of classes of share capital [line items]      
Number of shares registered (in shares) 299,998,125 299,998,125  
Par value per share (in CHF per share) SFr 0.10    
Class A shares | Treasury shares      
Disclosure of classes of share capital [line items]      
Sale of shares held by On in treasury (in shares) 5,163,096    
Purchase of On shares from employees (sell-to-cover) at current market price (in shares) 50,328    
Class B Shares      
Disclosure of classes of share capital [line items]      
Number of shares registered (in shares) 345,437,500 345,437,500  
Par value per share (in CHF per share) SFr 0.01