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Share-Based Compensation - Details of Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Vested or expected to vest        
Number of Options (in shares) 3,501      
Weighted Average Exercise Price (in dollars per share) $ 51.87 $ 46.44 $ 41.13 $ 36.05
Weighted Average Remaining Contractual Life (Years) 5 years 10 months 24 days      
Aggregate Intrinsic Value $ 142      
Exercisable        
Number of Options (in shares) 2,445      
Weighted Average Exercise Price (in dollars per share) $ 44.35      
Weighted Average Remaining Contractual Life (Years) 4 years 10 months 24 days      
Aggregate Intrinsic Value $ 118