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Share-Based Compensation - Details of Stock Options (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Vested or expected to vest  
Number of Options (in shares) | shares 3,610
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 46.44
Weighted Average Remaining Contractual Life (Years) 6 years 2 months 12 days
Aggregate Intrinsic Value | $ $ 104
Exercisable  
Number of Options (in shares) | shares 2,596
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 40.22
Weighted Average Remaining Contractual Life (Years) 5 years 4 months 24 days
Aggregate Intrinsic Value | $ $ 91