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Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax valuation allowance, rollfoward      
Balance at beginning of year $ 77    
Balance at end of year 75 $ 77  
Deferred tax asset valuation allowance      
Deferred tax valuation allowance, rollfoward      
Balance at beginning of year 77 65 $ 55
Charged to income tax expense 5 12 10
Charged to Retained earnings (7) 0 0
Balance at end of year $ 75 $ 77 $ 65