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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Valuation Allowance $ 542 $ 538  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 13    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   1 $ (1)
Amounts due to former parent 19 56  
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 320    
Due to former parent upon receipt from IRS   19  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 4 $ 455  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 243    
Decrease in Unrecognized Tax Benefits is Reasonably Possible 5    
Undistributed Earnings of Foreign Subsidiaries 1,100    
Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 1