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Income Taxes Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Effective income tax, percent 50.60% 14.30% 17.10%
Interest expense and penalties included in other income (expense), net $ (28) $ (1) $ (4)
Net operating loss carryforward recognized 32 28 $ 79
Accrued interest and penalties 60 34  
Operating loss carryforwards 219    
Reinvestment of future remittances of undistributed earnings of foreign subsidiaries 8,484    
Unrecognized tax benefits, interest on income tax expense 232 $ 209  
United States      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 106    
Foreign Tax Authority      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 113    
Operating loss carryforwards, valuation allowance 36    
Tax credit carryforward, amount 43    
Tax credit carryforward, valuation allowance $ 40