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Income Taxes - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Feb. 26, 2019
Debt Instrument [Line Items]      
Income tax expense (benefit) $ 72,000,000 $ (132,000,000)  
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 $ 700,000,000