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Income Taxes - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Feb. 26, 2019
Income Tax Disclosure [Abstract]      
Income tax (benefit) expense $ (132,000,000) $ 15,000,000  
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 21.00%    
Increase (decrease) in deferred tax asset valuation allowance $ (235,000,000)    
Senior Notes | 101% notes maturing 2029      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 700,000,000