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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]    
Decrease in valuation allowance   $ 28
Impact of a multi-year reserve for deductions related to domestic production activities $ 20  
Unrecognized tax benefits that would impact effective tax rate 248  
Decrease in unrecognized tax benefits is reasonably possible 15  
Net interest expense related to uncertain tax positions 5  
Accrued interest and penalties for uncertain tax position $ 14 9
Domestic Tax Authority    
Operating Loss Carryforwards [Line Items]    
Operating loss and tax credit carryforwards   19
State and Local Jurisdiction    
Operating Loss Carryforwards [Line Items]    
Operating loss and tax credit carryforwards   $ 44