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Income Taxes (Narratives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Examination      
Income taxes receivable $ 174    
Income tax payable   $ 30  
Net operating loss carryforwards 177 108  
Unrecognized tax benefits 45 61 $ 75
Unrecognized tax benefits that would impact tax rate 38 52  
Tax benefits interest expense for unpaid taxes 3 4 $ 5
Unrecognized tax benefits interest and penalties accrued 19 24  
Unrecognized tax benefits that may be recognized during the next twelve month period $ 1    
Recognition period 12 months    
Federal and State      
Income Tax Examination      
Net operating loss carryforwards $ 68 42  
State      
Income Tax Examination      
Valuation allowance against net operating loss deferred tax assets 48 36  
Foreign      
Income Tax Examination      
Foreign net operating loss carryforwards resulting in deferred tax assets $ 110 $ 66