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Stock Options and Other Share-Based Compensation - Summary of Valuation Assumptions and Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock Option      
Expected term in years 6 years 9 months 18 days 6 years 7 months 6 days 6 years 7 months 6 days
Volatility 31.10% 20.80% 20.50%
Risk-free interest rate based on zero coupon U.S. treasury note 0.71% 1.50% 2.60%
Dividend yield 6.00% 4.00% 3.80%
Weighted-average fair value per option granted (in dollars per share) $ 12.22 $ 13.00 $ 15.82
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 90,150    
Shares, Granted (in shares) 6,948    
Shares, Exercised (in shares) (12,831)    
Shares, Forfeited (in shares) (6,868)    
Outstanding, ending balance (in shares) 77,399 90,150  
Shares, Exercisable at December 31 (in shares) 66,499    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted-Average Exercise Price, Outstanding at January 1 (in dollars per share) $ 108.17    
Weighted-Average Exercise Price, Granted (in dollars per share) 88.20    
Weighted-Average Exercise Price, Exercised (in dollars per share) 99.64    
Weighted-Average Exercise Price, Forfeited (in dollars per share) 102.61    
Weighted-Average Exercise Price, Outstanding at December 31 (in dollars per share) 108.10 $ 108.17  
Weighted-Average Exercise Price, Exercisable at December 31 (in dollars per share) $ 109.80    
Average Remaining Contractual Term, Outstanding at December 31 (in years) 4 years 2 months 1 day    
Average Remaining Contractual Term, Exercisable at December 31 (in years) 3 years 5 months 12 days    
Aggregate Intrinsic Value, Outstanding at December 31 $ 1,020    
Aggregate Intrinsic Value, Exercisable at December 31 $ 806