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Share-Based Compensation - Details of Stock Options (Details)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Vested or expected to vest  
Number of Options (in shares) | shares 3,528
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 51.86
Weighted Average Remaining Contractual Life 6 years 4 months 24 days
Aggregate Intrinsic Value | $ $ 143
Exercisable  
Number of Options (in shares) | shares 2,458
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 44.27
Weighted Average Remaining Contractual Life 5 years 4 months 24 days
Aggregate Intrinsic Value | $ $ 118