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Income Taxes Income Taxes (Components of Deferred Income Tax) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of Deferred Tax Expense [Line Items]      
Deferred Income Tax Expense (Benefit) $ (14) $ (353) $ (18)
Deferred Benefit [Member]      
Components of Deferred Tax Expense [Line Items]      
Deferred Income Tax Expense (Benefit) 14 254 48
Tax reserves and allowances on current year activity [Member]      
Components of Deferred Tax Expense [Line Items]      
Deferred Income Tax Expense (Benefit) (20) (210) (39)
Tax reserves and allowances on beginning of the year balances [Member] [Member]      
Components of Deferred Tax Expense [Line Items]      
Deferred Income Tax Expense (Benefit) 0 (320) (9)
Unremitted foreign earnings [Member]      
Components of Deferred Tax Expense [Line Items]      
Deferred Income Tax Expense (Benefit) 0 (77) (5)
U.K. statutory rate change [Member]      
Components of Deferred Tax Expense [Line Items]      
Deferred Income Tax Expense (Benefit) $ (8) $ 0 $ (13)