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Share-Based Compensation (RSU Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense $ 22 $ 20 $ 8
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense 10 11 17
Tax benefit (1) (2) (4)
Compensation expense, net of tax 9 9 13
Total value of RSUs converted [1] 12 10 10
Total fair value of RSUs vested $ 10 $ 16 $ 15
[1]
Amount represents fair market value on the date of conversion.