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Share capital, dividends and earnings per share - Share activity (Details) - shares
shares in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Treasury stock shares      
Treasury stock, balance (in shares) 6.4    
Balance (in shares) 499.7 499.7 499.7
Balance (in shares) 499.7 499.7 499.7
Common stock shares outstanding      
Common stock shares outstanding      
Number of shares outstanding (in shares) 491.8 490.1 489.2
Settlement of equity-based awards (in shares) 1.5 1.7 0.9
Number of shares outstanding (in shares) 493.2 491.8 490.1
Treasury stock shares      
Treasury stock shares      
Treasury stock, balance (in shares) 7.9 9.6 10.5
Settlement of equity-based awards (in shares) (1.5) (1.7) (0.9)
Treasury stock, balance (in shares)   7.9 9.6