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GENERAL - Narrative (Details) shares in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2025 USD ($) payment | Nov. 03, 2024 USD ($) | Nov. 03, 2023 USD ($) | Sep. 30, 2023 USD ($) $ / BTU shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Nov. 03, 2025 USD ($) payment | Nov. 30, 2023 USD ($) | Aug. 31, 2023
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Limited partner interest |  |  |  |  |  |  | 48.80% |  |  |  |
Non-voting limited partner interest |  |  |  |  |  |  | 2.00% |  |  |  |
Gain on investment |  |  |  | $ 51 |  |  |  |  |  |  |
Non-core proved and unproved properties sold |  |  |  | 202 |  |  |  |  |  |  |
Gain on disposition of assets |  |  |  | $ 142 | $ 192 | $ 74 | $ 197 | $ 232 |  |  |
Carbon Engineering, Ltd. |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest acquired, percent |  |  |  |  |  |  |  |  |  |  | 67.83%
Carbon Engineering, Ltd. | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 355 |  |  |  |  |  |  |  |
Forecast | Carbon Engineering, Ltd. | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 355 | $ 355 |  |  |  |  |  |  | $ 1,100 |  |
Number of equal annual payments | payment | 3 |  |  |  |  |  |  |  | 3 |  |
WES |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased limited partner units (in shares) | shares |  |  |  | 5.1 |  |  |  |  |  |  |
Price per unit | $ / BTU |  |  |  | 25.00 |  |  |  |  |  |  |
BlackRock, Inc. | Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment commitments |  |  |  |  |  |  |  |  |  | $ 550 |
Land |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  | $ 0 |  | $ 180 |  |  |  |
WES |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective economic interest |  |  |  |  |  |  | 51.00% |  |  |  |
Black Butte Coal |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of equity method investment |  |  |  |  |  |  | $ 29 |  |  |  |
WES |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-voting general partner interest |  |  |  |  |  |  | 2.30% |  |  |  |

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