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Share-Based Compensation (RSU Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense $ 14 $ 21 $ 22
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense 12 10 10
Tax benefit (2) (2) (1)
Compensation expense, net of tax 10 8 9
Total value of RSUs converted [1] 13 11 12
Total fair value of RSUs vested $ 10 $ 10 $ 10
[1] Amount represents fair market value on the date of conversion.