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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, 2025
Mar. 31, 2024
Dec. 31, 2024
Share-based compensation      
Options granted (in shares) 158 178  
Assumptions used to measure the fair value of awards      
Expected life (in years) 5 years 6 months 5 years 6 months  
Risk-free interest rate 4.10% 4.20%  
Expected volatility 28.20% 28.10%  
Expected dividend yield 2.50% 2.90%  
Stock options, Number of Options      
Outstanding at the beginning of the period (in shares) 1,453    
Granted (in shares) 158 178  
Exercised (in shares) (16)    
Cancelled (in shares) 0    
Outstanding at the end of the period (in shares) 1,595   1,453
Exercisable at the end of the period (in shares) 1,271    
Stock options, Weighted Average Exercise Price per Share      
Outstanding at the beginning of the period (in dollars per share) $ 100.04    
Granted (in dollars per share) 130.57    
Exercised (in dollars per share) 94.22    
Cancelled (in dollars per share) 0    
Outstanding at the end of the period (in dollars per share) 103.12   $ 100.04
Exercisable at the end of the period (in dollars per share) $ 99.43    
Additional information pertaining to stock options      
Average remaining contractual term, outstanding 5 years 9 months 18 days   5 years 7 months 6 days
Average remaining contractual term, exercisable 5 years    
Aggregate intrinsic value, outstanding (in dollars) $ 52   $ 55
Aggregate intrinsic value, exercisable (in dollars) 46    
Cash received from exercise of stock options $ 2    
Weighted average grant date fair value of stock options granted (in dollars per share) $ 33.53 $ 26.33  
Total intrinsic value of stock options exercised (in dollars) $ 1 $ 5  
Stock options      
Share-based compensation      
Term of award 10 years    
Period of vesting 3 years    
Additional information pertaining to stock options      
Unrecognized compensation cost $ 6    
Weighted-average period for amortization of unrecognized compensation cost 1 year 4 months 24 days