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Equity - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
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 (as a percent)     4.00% 2.00%  
Expected volatility (as a percent)     28.30% 23.80%  
Expected dividend yield (as a percent)     2.90% 2.90%  
Stock options, Number of Options          
Outstanding at the beginning of the period (in shares)     2,222    
Granted (in shares)     197 281  
Exercised (in shares)     (345)    
Cancelled (in shares)     (62)    
Outstanding at the end of the period (in shares) 2,012   2,012   2,222
Exercisable at the end of the period (in shares) 1,565   1,565    
Stock options, Weighted Average Exercise Price per Share          
Outstanding at the beginning of the period (in dollars per share)     $ 92.32    
Granted (in dollars per share)     98.69    
Exercised (in dollars per share)     72.76    
Cancelled (in dollars per share)     105.47    
Outstanding at the end of the period (in dollars per share) $ 95.89   95.89   $ 92.32
Exercisable at the end of the period (in dollars per share) $ 96.88   $ 96.88    
Additional information pertaining to stock options          
Average Remaining Contractual Term, Outstanding     5 years 2 months 1 day   5 years 1 month 28 days
Average Remaining Contractual Term, Exercisable     4 years 2 months 12 days    
Aggregate Intrinsic Value, Outstanding (in dollars) $ 15   $ 15   $ 24
Aggregate Intrinsic Value, Exercisable (in dollars) $ 12   12    
Cash received from exercise of stock options     $ 25    
Weighted average grant date fair value of stock options granted (in dollars per share) $ 0 $ 0 $ 23.80 $ 15.04  
Total intrinsic value of stock options exercised (in dollars) $ 1 $ 1 $ 11 $ 2  
Stock options          
Share-based compensation          
Term of award     10 years    
Period of vesting     3 years    
Requisite service period     1 year    
Additional information pertaining to stock options          
Unrecognized compensation cost $ 4   $ 4    
Weighted-average period for amortization of unrecognized compensation cost     1 year 7 months 6 days