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Share-Based Compensation - Summary of Outstanding and Exercisable Options and SARs (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
SARs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Aggregate intrinsic value - outstanding $ 106
Weighted-average remaining contractual term - outstanding 5 years 10 months 10 days
Aggregate intrinsic value - exercisable $ 68
Weighted-average remaining contractual term - exercisable 5 years 5 days
Non-qualified Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Aggregate intrinsic value - outstanding $ 1
Weighted-average remaining contractual term - outstanding 5 months 2 days
Aggregate intrinsic value - exercisable $ 1
Weighted-average remaining contractual term - exercisable 5 months 2 days