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Income Taxes (Narratives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Examination      
Income taxes receivable $ 30    
Income tax payable   $ (141)  
Net operating loss carryforwards 108 130  
Unrecognized tax benefits 61 75 $ 87
Unrecognized tax benefits that would impact tax rate 52 56  
Tax benefits interest expense for unpaid taxes 4 5 $ 6
Unrecognized tax benefits interest and penalties accrued 24 22  
Unrecognized tax benefits that may be recognized during the next twelve month period $ 15    
Recognition period 12 months    
Federal and State      
Income Tax Examination      
Net operating loss carryforwards $ 42 44  
State      
Income Tax Examination      
Valuation allowance against net operating loss deferred tax assets 36 37  
Foreign      
Income Tax Examination      
Foreign net operating loss carryforwards resulting in deferred tax assets 66 86  
Foreign tax credit carryforwards $ 0 $ 3