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Share-Based Compensation (RSU Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense $ 21 $ 22 $ 20
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense 10 10 11
Tax benefit (2) (1) (2)
Compensation expense, net of tax 8 9 9
Total value of RSUs converted [1] 11 12 10
Total fair value of RSUs vested $ 10 $ 10 $ 16
[1] Amount represents fair market value on the date of conversion.