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%