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Income Taxes - Reconciliation of Uncertain Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Uncertain tax benefits        
Uncertain tax benefits $ 30 $ 34 $ 26 $ 30
Liability for uncertainty in income taxes, noncurrent     30 33
Unrecognized tax benefits, income tax penalties expense 1      
Accrued interest and penalties related to unrecognized tax benefits     $ 4 $ 3
Uncertain tax benefits reconciliation        
Balance as of January 1 30 34    
Increase due to current year positions 4 4    
Decrease due to prior year positions 0 (8)    
Decrease due to settlements and payments (8) 0    
Uncertain tax benefits as of December 31 $ 26 $ 30