SEGMENTS - Schedule of Industry Segments and Eliminations (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment shares	Sep. 30, 2022 USD ($) shares
Segment Information
Number of operating segments | segment					3
Net sales		$ 7,158		$ 9,390	$ 21,085	$ 28,415
Income (loss) before income taxes		1,809		3,648	4,870	11,717
Income tax expense		(434)		(902)	(1,372)	(340)
NET INCOME		1,375		2,746	3,498	11,377
Gains on sales of assets, net	$ 142	192		74	197	232
Maxus Filed Bankruptcy
Segment Information
Gains related to legal settlements			$ 260		260
Deferred Income Tax Charge
Segment Information
Deferred tax benefit (charge)		3			(65)
Black Butte Coal
Segment Information
Impairment of equity method investment					29
Land
Segment Information
Impairment and related charges		0			180
Oil and gas | Black Butte Coal
Segment Information
Impairment of equity method investment					29
Oil and gas | Land
Segment Information
Impairment and related charges					180
Operating segments | Oil and gas
Segment Information
Net sales		5,594		7,098	15,860	20,869
Income (loss) before income taxes		1,969		3,345	4,668	10,337
Income tax expense		0		0	0	0
NET INCOME		1,969		3,345	4,668	10,337
Gains related to legal settlements					26
Operating segments | Oil and gas | Disposed of by sale, not discontinued operations | Permian Basin
Segment Information
Gains on sales of assets, net		142			142	147
Operating segments | Chemical
Segment Information
Net sales		1,309		1,691	4,089	5,284
Income (loss) before income taxes		373		580	1,281	2,051
Income tax expense		0		0	0	0
NET INCOME		373		580	1,281	2,051
Operating segments | Midstream and marketing
Segment Information
Net sales		552		1,005	1,919	3,361
Income (loss) before income taxes		(130)		104	(158)	318
Income tax expense		0		0	0	0
NET INCOME		(130)		104	(158)	318
Operating segments | Midstream and marketing | Disposed of by sale, not discontinued operations | WES Midstream segment
Segment Information
Impairment and related charges		34			60
Mark to market gain (loss) on interest rate swaps		(81)		84	(41)	186
Gain on sale					$ 51	$ 62
Number of limited partner units sold (in shares) | shares					5.1	10.0
Corporate and eliminations
Segment Information
Net sales		(297)		(404)	$ (783)	$ (1,099)
Income (loss) before income taxes		(403)		(381)	(921)	(989)
Income tax expense		(434)		(902)	(1,372)	(340)
NET INCOME		$ (837)		(1,283)	$ (2,293)	(1,329)
Mark to market gain (loss) on interest rate swaps				$ 70		332
Non-cash income tax benefit from reorganization						2,600
Gain on debt extinguished						$ 143