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Income Taxes (Narratives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Examination      
Income taxes receivable $ 147 $ 174  
Net operating loss carryforwards 221 177  
Unrecognized tax benefits 44 45 $ 61
Unrecognized tax benefits that would impact tax rate 38 38  
Tax benefits interest expense for unpaid taxes 3 3 $ 4
Unrecognized tax benefits interest and penalties accrued 15 19  
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 $ 90 68  
State      
Income Tax Examination      
Valuation allowance against net operating loss deferred tax assets 48 48  
Foreign      
Income Tax Examination      
Foreign net operating loss carryforwards resulting in deferred tax assets $ 131 $ 110