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Income Taxes - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Feb. 26, 2019
Debt Instrument [Line Items]            
Income tax expense (benefit) $ 18,000,000 $ 130,000,000   $ 89,000,000 $ (2,000,000)  
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