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Dividends and earnings per share (Details)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 27, 2023
SFr / shares
Feb. 15, 2022
SFr / shares
May 31, 2023
USD ($)
May 31, 2022
USD ($)
Jun. 30, 2023
shares
Jun. 30, 2022
shares
Jun. 30, 2023
shares
Jun. 30, 2022
shares
Earnings per share [abstract]                
Dividend declared (in dollars per share) | SFr / shares SFr 0.21 SFr 0.20            
Dividends paid | $     $ 116 $ 100        
Number of shares outstanding         493.1   493.1  
Number of shares vested             1.3  
Weighted average number of shares outstanding - basic (in shares)         493.2 491.7 492.8 491.3
Weighted average number of shares outstanding - diluted (in shares)         495.7 494.3 495.9 494.2
Potentially dilutive shares         2.5 2.6 3.1 2.9