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Equity - Stock options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Stock options, Number of Options      
Outstanding at the beginning of the period (in shares) 2,154    
Granted (in shares) 281 358  
Exercised (in shares) (36)    
Cancelled (in shares) (13)    
Outstanding at the end of the period (in shares) 2,386   2,154
Exercisable at the end of the period (in shares) 1,805    
Stock options, Weighted Average Exercise Price per Share      
Outstanding at the beginning of the period (in dollars per share) $ 90.39    
Granted (in dollars per share) 88.66    
Exercised (in dollars per share) 57.65    
Cancelled (in dollars per share) 117.27    
Outstanding at the end of the period (in dollars per share) 90.54   $ 90.39
Exercisable at the end of the period (in dollars per share) $ 91.34    
Additional information pertaining to stock options      
Average Remaining Contractual Term, Outstanding 5 years 8 months 8 days   5 years 3 months 3 days
Average Remaining Contractual Term, Exercisable 4 years 6 months 21 days    
Aggregate Intrinsic Value, Outstanding (in dollars) $ 12   $ 26
Aggregate Intrinsic Value, Exercisable (in dollars) 12    
Cash received from exercise of stock options $ 2    
Weighted average grant date fair value of stock options granted (per share) $ 15.04 $ 12.31  
Total intrinsic value of stock options exercised $ 1 $ 5  
Employee Stock Option      
Share-based compensation      
Term of award 10 years    
Period of vesting 3 years    
Required service period 1 year    
Assumptions used to measure the fair value of awards      
Expected life 5 years 6 months 5 years 6 months  
Risk-free interest rate (as a percent) 2.00% 0.60%  
Expected volatility (as a percent) 23.80% 23.20%  
Expected dividend yield (as a percent) 2.90% 2.90%  
Additional information pertaining to stock options      
Unrecognized compensation cost $ 6    
Weighted-average period for amortization of unrecognized compensation cost 2 years