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Share-based Compensation (Equity-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense $ 30 $ 15
Tax benefit recognized 3 3
PRSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense 10 2
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense 6 7
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense 9 5
SARs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense $ 5 $ 1