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Income Taxes Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]      
Effective income tax, percent 14.30% 17.10% 55.60%
Interest expense and penalties included in other income (expense), net $ (1) $ (4) $ 8
Net operating loss carryforward recognized 28 79 $ 78
Accrued interest and penalties 34 30  
Operating loss carryforwards 185    
Reinvestment of future remittances of undistributed earnings of foreign subsidiaries 8,391    
Unrecognized tax benefits, interest on income tax expense 281 $ 304  
United States      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 160    
Foreign Tax Authority      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 25    
Operating loss carryforwards, valuation allowance 45    
Tax credit carryforward, valuation allowance $ 40