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LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 03, 2025 | Jan. 03, 2025 | Jan. 02, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | May 28, 2025 | Mar. 31, 2025 | Feb. 21, 2025 | Aug. 02, 2023
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | $ 120 | $ 117 | $ 341 | $ 342 |  |  |  |  |
Proceeds from issuance of senior notes |  |  |  |  |  | $ 743 | 0 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Minimum current ratio covenant |  |  |  |  |  | 1.00 |  |  |  |  |  |
Coverage ratio |  |  |  |  |  | 1.50 |  |  |  |  |  |
Vencer Acquisition |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration to be paid January 3, 2025 |  |  | $ 550 |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  | $ 532 |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | $ 9 |  | $ 27 |  |  |  |  |
Business Combination, Cash Consideration Paid |  | $ 475 |  |  |  |  |  | $ 75 |  |  |  |
Amended Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 4,000
Borrowing base amount |  |  |  | 3,300 |  | $ 3,300 |  |  | $ 3,300 | $ 3,400 |  |
Aggregate elected commitments |  |  |  | $ 2,500 |  | $ 2,500 |  | 2,200 | $ 2,500 |  | $ 2,500 |
Covenant, minimum percentage of mortgage on total value of certain proved oil and gas properties |  |  |  | 90.00% |  | 90.00% |  |  |  |  |  |
Maximum net leverage ratio |  |  |  | 3.00 |  | 3.00 |  |  |  |  |  |
Deferred financing costs, gross |  |  |  | $ 25 |  | $ 25 |  | 29 |  |  |  |
Deferred financing costs, net |  |  |  | 16 |  | 16 |  | 21 |  |  |  |
Unamortized deferred financing costs |  |  |  | $ 9 |  | $ 9 |  | $ 8 |  |  |  |
Amended Credit Agreement | Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.50% |  |  |  |  |  |
Amended Credit Agreement | Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |  |  |
Basis spread on variable rate, floor |  |  |  |  |  | 0.50% |  |  |  |  |  |
Amended Credit Agreement | Revolving Credit Facility | SOFR | Minimum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.75% |  |  |  |  |  |
Amended Credit Agreement | Revolving Credit Facility | SOFR | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.75% |  |  |  |  |  |
Amended Credit Agreement | Revolving Credit Facility | SOFR, Plus Basis Spread One |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate, floor |  |  |  |  |  | 1.50% |  |  |  |  |  |
Amended Credit Agreement | Revolving Credit Facility | SOFR, Plus Basis Spread One | Minimum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.75% |  |  |  |  |  |
Amended Credit Agreement | Revolving Credit Facility | SOFR, Plus Basis Spread One | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.75% |  |  |  |  |  |
Senior Notes Due 2033, 9.625% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior notes | $ 743 |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 7 |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2033, 9.625% | Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 104.813% |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2033, 9.625% | Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 102.406% |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2033, 9.625% | Senior Notes | Debt Instrument, Redemption, Period Three |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2033, 9.625% | Senior Notes | Debt Instrument, Redemption, Period Four |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 35.00% |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2033, 9.625% | Senior Notes | Debt Instrument, Redemption, Period Five |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 109.625% |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2033, 9.625% | Senior Notes | Debt Instrument, Redemption, Period Six |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 65.00% |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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