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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 |  |  |

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