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Equity (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
SFr / shares
Disclosure of classes of share capital [line items]        
Share capital at beginning of period $ 901 $ 913 $ 936  
Treasury shares at beginning of period (48) (53) (80)  
Total outstanding share capital at beginning of period 853 860 856  
Share capital movement of period (11) (12) (23)  
Treasury shares movement of period (44) 5 27  
Total shares outstanding movement of period (55) (7) 4  
Share capital at end of period 890 901 913  
Treasury shares at end of period (92) (48) (53)  
Total outstanding share capital at end of period $ 798 $ 853 $ 860  
Par value per share | SFr / shares       SFr 0.50