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Stock-based compensation (Summary of RSUs) (Details) - RSUs [Member] - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Units      
Balance nonvested at beginning of period (in shares) 3.0    
Granted (in shares) 1.0    
Vested (in shares) (0.9)    
Forfeited (in shares) (0.3)    
Balance nonvested at end of period (in shares) 2.8 3.0  
Weighted-average grant date fair value      
Balance nonvested at beginning of period (in usd per share) $ 217.95    
Granted (in usd per share) 234.47 $ 233.10 $ 235.63
Vested (in usd per share) 201.47    
Forfeited (in usd per share) 226.15    
Balance nonvested at end of period (in usd per share) $ 228.71 $ 217.95