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Share-Based Compensation (RSU Compensation Expense) (Details) - RSUs - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense $ 14 $ 13 $ 12
Tax benefit (4) (3) (3)
compensation expense, net of tax 10 10 9
Total value of RSUs converted [1] 7 16 25
Total fair value of RSUs vested $ 13 $ 12 $ 13
[1] Amount represents fair market value on the date of conversion.