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Long-Term Debt - 6.625% Senior Secured Notes, Due 2025 - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 06, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]            
Pre-tax loss from extinguishment of debt       $ (4,000,000) $ (31,000,000)  
Senior Secured Notes at 6.25%, Due 2023            
Debt Instrument [Line Items]            
Extinguishment of debt amount $ 426,000,000          
Senior Secured Notes | Senior Secured Notes at 6.625% Due 2025            
Debt Instrument [Line Items]            
Debt instrument, offering date       Feb. 06, 2020    
Debt instrument aggregate principal amount $ 1,462,000,000          
Debt instrument stated interest rate 6.625% 6.625%   6.625%   6.625%
Debt instrument, maturity date       Feb. 15, 2025    
Extinguishment of debt amount   $ 0 $ 0      
Debt instrument redemption price percentage       100.00%    
Pre-tax loss from extinguishment of debt       $ (4,000,000) (31,000,000)  
After-tax loss from extinguishment of debt       $ (3,000,000) $ (23,000,000)  
Senior Secured Notes | Senior Secured Notes at 6.25%, Due 2023            
Debt Instrument [Line Items]            
Debt instrument stated interest rate   6.25%   6.25%   6.25%