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DEBT - Second Lien Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 27, 2020
Dec. 31, 2015
Mar. 31, 2020
Dec. 31, 2019
Oct. 31, 2014
Second Lien Term Loan | Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 200,000,000        
Debt instrument, term 5 years        
Financial covenant minimum month end liquidity $ 170,000,000        
Financial covenant, liquidity threshold 247,000,000        
Financial covenant, increase in commitment threshold $ 51,000,000        
Second Lien Term Loan | Line of Credit | Prior to 90 Days          
Debt Instrument [Line Items]          
Percentage of principal amount at which notes can be redeemed prior to their maturity date 100.00%        
Second Lien Term Loan | Line of Credit | After 90 Days, Before First Anniversary Date          
Debt Instrument [Line Items]          
Percentage of principal amount at which notes can be redeemed prior to their maturity date 105.00%        
Second Lien Term Loan | Line of Credit | After the First Anniversary Date, Before Second Anniversary Date          
Debt Instrument [Line Items]          
Percentage of principal amount at which notes can be redeemed prior to their maturity date 103.00%        
Second Lien Term Loan | Line of Credit | After the Second Anniversary Date, Before Third Anniversary Date          
Debt Instrument [Line Items]          
Percentage of principal amount at which notes can be redeemed prior to their maturity date 102.00%        
Second Lien Term Loan | Line of Credit | After the Third Anniversary Date, Before Fourth Anniversary Date          
Debt Instrument [Line Items]          
Percentage of principal amount at which notes can be redeemed prior to their maturity date 101.00%        
Second Lien Term Loan | Line of Credit | Fifth Year          
Debt Instrument [Line Items]          
Percentage of principal amount at which notes can be redeemed prior to their maturity date 100.00%        
Second Lien Term Loan | Line of Credit | LIBOR          
Debt Instrument [Line Items]          
Interest rate floor 1.00%        
Interest rate added to variable rate basis 1.00%        
Second Lien Term Loan | Line of Credit | Alternative Base Rate          
Debt Instrument [Line Items]          
Interest rate floor 2.00%        
Second Lien Term Loan | Line of Credit | Federal Funds Rate          
Debt Instrument [Line Items]          
Interest rate added to variable rate basis 0.50%        
Second Lien Term Loan | Line of Credit | ABR Applicable Margin | After Second Anniversary          
Debt Instrument [Line Items]          
Interest rate added to variable rate basis 8.00%        
Second Lien Term Loan | Line of Credit | ABR Applicable Margin | Minimum | Prior to Second Anniversary          
Debt Instrument [Line Items]          
Interest rate added to variable rate basis 8.00%        
Second Lien Term Loan | Line of Credit | ABR Applicable Margin | Maximum | Prior to Second Anniversary          
Debt Instrument [Line Items]          
Interest rate added to variable rate basis 9.50%        
Second Lien Term Loan | Line of Credit | LIBOR Applicable Margin | After Second Anniversary          
Debt Instrument [Line Items]          
Interest rate added to variable rate basis 9.00%        
Second Lien Term Loan | Line of Credit | LIBOR Applicable Margin | Minimum | Prior to Second Anniversary          
Debt Instrument [Line Items]          
Interest rate added to variable rate basis 9.00%        
Second Lien Term Loan | Line of Credit | LIBOR Applicable Margin | Maximum | Prior to Second Anniversary          
Debt Instrument [Line Items]          
Interest rate added to variable rate basis 10.50%        
Second Lien Notes          
Debt Instrument [Line Items]          
Face value of debt reduction through payment or repurchase     $ 7,000,000 $ 252,000,000  
Repurchase value of the principal amounts of senior debt     3,000,000 156,000,000  
Pre-tax unamortized deferred gain on early extinguishment of debt and deferred issuance costs     $ 5,000,000 $ 126,000,000  
Second Lien Notes | 8% Notes Due 2022          
Debt Instrument [Line Items]          
Aggregate principal amount issued   $ 2,250,000,000      
Interest rate   8.00%      
Senior Notes (Unsecured)          
Debt Instrument [Line Items]          
Aggregate principal amount issued         $ 5,000,000,000
Proceeds from Second Lien Notes used to reduce principal amount of senior note debt through exchange   $ 2,800,000,000      
Pre-tax unamortized deferred gain on early extinguishment of debt   $ 560,000,000