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Income Taxes Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]        
Effective income tax, percent   (50.80%) 50.60% 14.30%
Adjustment to transition tax provision $ 51      
Tax Cuts and Jobs Act of 2017 transition tax 2.20% 2.20% 38.00% 0.00%
Adjustment to deferred tax asset and liability remeasurement provision $ 13      
Deferred tax assets and liabilities adjustment, percent 0.60%      
Interest expense and penalties included in other income (expense), net   $ (9) $ (28) $ (1)
Net operating loss carryforward recognized   31 32 $ 28
Accrued interest and penalties $ 85 85 60  
Operating loss carryforwards 606 606    
Unrecognized tax benefits, interest on income tax expense   521 $ 232  
United States        
Income Tax Contingency [Line Items]        
Operating loss carryforwards 489 489    
Foreign Tax Authority        
Income Tax Contingency [Line Items]        
Operating loss carryforwards 117 117    
Operating loss carryforwards, valuation allowance 56 56    
Tax credit carryforward, amount 55 55    
Tax credit carryforward, valuation allowance $ 52 $ 52