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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Examination [Line Items]      
Income tax (payable) $ (141)    
Income taxes receivable   $ 13  
Net operating loss carryforwards 130 223  
Foreign net operating loss carryforwards resulting in deferred tax assets 86 174  
Foreign tax credit carryforwards 3 1  
Undistributed earnings of foreign subsidiaries 930 813  
Unrecognized tax benefits 75 87 $ 98
Unrecognized tax benefits that would impact tax rate 56 67  
Tax benefits interest expense for unpaid taxes 5 6 $ 2
Unrecognized tax benefits interest and penalties accrued 22 25  
Unrecognized tax benefits that may be recognized during the next twelve month period $ 3    
Recognition period 12 months    
Tax Act, re-measurement of deferred tax liabilities, tax benefit $ 751    
Tax Act, one-time deemed repatriation tax, tax expense 68    
Tax Act, release of undistributed foreign earnings liability, tax benefit 30    
Foreign taxes, tax benefit 48    
Federal and State      
Income Tax Examination [Line Items]      
Net operating loss carryforwards 44 49  
State and Local Jurisdiction [Member]      
Income Tax Examination [Line Items]      
Valuation allowance against net operating loss deferred tax assets $ 37 34  
Foreign Tax Authority [Member]      
Income Tax Examination [Line Items]      
Valuation allowance against net operating loss deferred tax assets   $ 143