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Share-Based Compensation (PSU Compensation Expense) (Details) - PSUs - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
PSU expense before income tax $ 5 $ 6 $ 4
Tax benefit (1) (2) (1)
Total expense, net of tax 4 4 3
Total value of PSUs converted [1] 1 4 0
Total fair value of PSUs vested $ 3 $ 1 $ 0
[1] (1)Amount represents fair market value on the date of conversion.