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DEBT - Revolving Credit Facility (Details) - USD ($) |  |  | 2 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 | Oct. 27, 2020 | Dec. 31, 2020 | Sep. 30, 2014
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 900,000,000
Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 540,000,000 |  |
Line of credit facility, expected reduction of commitments |  | 492,000,000 |  |
Line of current borrowing capacity |  | 1,200,000,000 | $ 307,000,000 |
Proceeds from long-term lines of credit |  | $ 225,000,000 |  |
Margin increase, percentage |  | 0.25% |  |
Margin increase, additional increase each subsequent fiscal quarter |  | 0.25% |  |
Line of credit facility, unused capacity, commitment fee percentage |  | 0.50% |  |
Revolving Credit Facility | Line of Credit | First 24 Months |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Derivative, hedging percent |  | 50.00% |  |
Revolving Credit Facility | Line of Credit | First 24 Months | Crude Oil Hedge Positions |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Derivative, allocation percent |  | 75.00% |  |
Derivative, period |  | 24 months |  |
Revolving Credit Facility | Line of Credit | Month 25 Through Month 36 | Crude Oil Hedge Positions |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Derivative, allocation percent |  | 50.00% |  |
Revolving Credit Facility | Line of Credit | 48 Month Period |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Derivative, period |  | 48 months |  |
Derivative, hedging percent |  | 80.00% |  |
Revolving Credit Facility | Line of Credit | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate floor |  | 1.00% |  |
Interest rate added to variable rate basis |  | 1.00% |  |
Revolving Credit Facility | Line of Credit | LIBOR | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  |  | 3.00% |
Revolving Credit Facility | Line of Credit | LIBOR | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  |  | 4.00% |
Revolving Credit Facility | Line of Credit | Alternative Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate floor |  | 2.00% |  |
Revolving Credit Facility | Line of Credit | Alternative Base Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  |  | 2.00% |
Revolving Credit Facility | Line of Credit | Alternative Base Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  |  | 3.00% |
Revolving Credit Facility | Line of Credit | Federal Funds Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  | 0.50% |  |
Revolving Credit Facility | Line of Credit | LIBOR Applicable Margin | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  | 3.00% |  |
Revolving Credit Facility | Line of Credit | LIBOR Applicable Margin | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  | 4.00% |  |
Revolving Credit Facility | Line of Credit | ABR Applicable Margin | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  | 2.00% |  |
Revolving Credit Facility | Line of Credit | ABR Applicable Margin | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate added to variable rate basis |  | 3.00% |  |
Revolving Credit Facility | Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from long-term lines of credit | $ 118,000,000 | $ 118,000,000 |  |
Letters of Credit | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 200,000,000 |  |
Letters of credit outstanding amount |  |  | $ 134,000,000 |

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