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Share-Based Compensation - Details of Stock Options (Details)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Vested or expected to vest  
Number of Options (in shares) | shares 3,931
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 50.93
Weighted Average Remaining Contractual Life 6 years 7 months 6 days
Aggregate Intrinsic Value | $ $ 99
Exercisable  
Number of Options (in shares) | shares 2,848
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 43.98
Weighted Average Remaining Contractual Life 5 years 8 months 12 days
Aggregate Intrinsic Value | $ $ 92