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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Contingency [Line Items]      
Effective income tax, percent 18.70% (50.80%) 50.60%
Interest expense and penalties included in other income (expense), net $ (9) $ (9) $ (28)
Net operating loss carryforward recognized 50 31 $ 32
Accrued interest and penalties 94 85  
Operating loss carryforwards 378    
Unrecognized tax benefits, interest on income tax expense 468 $ 521  
United States      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 358    
Foreign Tax Authority      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 20    
Tax credit carryforward, amount 65    
Tax credit carryforward, valuation allowance $ 63