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Share capital, dividends and earnings/(loss) per share - Share activity (Details) - shares
shares in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Treasury Stock [Roll Forward]      
Issuance of additional registered shares (in shares)     8.0
Treasury stock, balance (in shares) 7.9    
Balance (in shares) 499.7 499.7 491.7
Balance (in shares) 499.7 499.7 499.7
Common stock shares outstanding      
Reconciliation of number of shares outstanding [abstract]      
Number of shares outstanding (in shares) 490.1 489.2 488.3
Settlement of equity-based awards (in shares) 1.7 0.9 0.9
Number of shares outstanding (in shares) 491.8 490.1 489.2
Treasury stock shares      
Reconciliation of Treasury Stock [Roll Forward]      
Treasury stock, balance (in shares) 9.6 10.5 3.4
Issuance of additional registered shares (in shares)     8.0
Settlement of equity-based awards (in shares) (1.7) (0.9) (0.9)
Treasury stock, balance (in shares)   9.6 10.5