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Share-Based Compensation (RSU Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense $ 20 $ 8 $ 10
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense 11 17 14
Tax benefit (2) (4) (4)
compensation expense, net of tax 9 13 10
Total value of RSUs converted [1] 10 10 7
Total fair value of RSUs vested $ 16 $ 15 $ 13
[1] Amount represents fair market value on the date of conversion.