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Share-Based Compensation Plans - Summary of Information Relative to Stock Option Plan Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of Options, Outstanding, January 1 (in shares) 23,807    
Number of Options, Granted (in shares) 2,796    
Number of Options, Exercised (in shares) (8,119)    
Number of Options, Forfeited (in shares) (616)    
Number of Options, Outstanding, December 31 (in shares) 17,868 23,807  
Number of Options, Exercisable (in shares) 11,837    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Weighted Average Exercise Price, Options Outstanding, January 1 (in dollars per share) $ 51.89    
Weighted Average Exercise Price, Granted (in dollars per share) 80.05 $ 58.15 $ 63.88
Weighted Average Exercise Price, Exercised (in dollars per share) 44.48    
Weighted Average Exercise Price, Forfeited (in dollars per share) 45.48    
Weighted Average Exercise Price, Options Outstanding, December 31 (in dollars per share) 59.88 $ 51.89  
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 55.40    
Weighted Average Remaining Contractual Term, Outstanding 6 years 5 months 23 days    
Weighted Average Remaining Contractual Term, Exercisable 5 years 5 months 12 days    
Aggregate Intrinsic Value, Outstanding $ 555    
Aggregate Intrinsic Value, Exercisable $ 421