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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Option      
Expected term in years 6 years 6 months 6 years 3 months 18 days 6 years 3 months 18 days
Volatility 21.20% 21.70% 21.70%
Risk-free interest rate based on zero coupon U.S. treasury note 2.60% 2.20% 1.60%
Dividend yield 3.80% 4.20% 4.50%
Weighted-average fair value per option granted (in dollars per share) $ 18.18 $ 15.31 $ 9.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 103,765    
Shares, Granted (in shares) 4,665    
Shares, Exercised (in shares) (12,991)    
Shares, Forfeited (in shares) (715)    
Outstanding, ending balance (in shares) 94,724 103,765  
Shares, Exercisable at December 31, 2015 (in shares) 81,074    
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, 2015 (in dollars per share) $ 97.40    
Weighted-Average Exercise Price, Granted (in dollars per share) 125.35    
Weighted-Average Exercise Price, Exercised (in dollars per share) 88.11    
Weighted-Average Exercise Price, Forfeited (in dollars per share) 115.25    
Weighted-Average Exercise Price, Outstanding at December 31, 2016 (in dollars per share) 99.92 $ 97.40  
Weighted-Average Exercise Price, Exercisable at December 31, 2016 (in dollars per share) $ 99.34    
Average Remaining Contractual Term, Outstanding at December 31, 2016 (in years) 5 years 26 days    
Average Remaining Contractual Term, Exercisable at December 31, 2016 (in years) 4 years 7 months 6 days    
Aggregate Intrinsic Value, Outstanding at December 31, 2016 $ 1,101    
Aggregate Intrinsic Value, Exercisable at December 31, 2016 $ 933