Segments - Schedule of Industry Segments and Eliminations (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2022 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment shares	Sep. 30, 2021 USD ($) shares
Segment Information
Number of operating segments | segment				3
Net sales		$ 9,390	$ 6,792	$ 28,415	$ 18,043
Income (loss) from continuing operations before income taxes		3,648	1,217	11,717	1,675
Income tax expense		(902)	(387)	(340)	(446)
Income (loss) from continuing operations		2,746	830	11,377	1,229
Loss on derivative instrument		(70)	26	(332)	(150)
Anadarko acquisition-related costs		4	29	82	122
Disposed of by sale, not discontinued operations | WES Midstream segment
Segment Information
Gain on sale	$ 62
Number of limited partner units sold (in units) | shares	10.0
Operating segments | Oil and gas
Segment Information
Net sales		7,098	4,955	20,869	13,124
Income (loss) from continuing operations before income taxes		3,345	1,467	10,337	2,036
Income tax expense		0	0	0	0
Income (loss) from continuing operations		3,345	1,467	10,337	2,036
Loss on derivative instrument			97		277
Impairment charge					173
Operating segments | Oil and gas | Disposed of by sale, not discontinued operations | Permian Basin
Segment Information
Gain on sale				147
Operating segments | Chemical
Segment Information
Net sales		1,691	1,396	5,284	3,671
Income (loss) from continuing operations before income taxes		580	407	2,051	970
Income tax expense		0	0	0	0
Income (loss) from continuing operations		580	407	2,051	970
Operating segments | Midstream and marketing
Segment Information
Net sales		1,005	702	3,361	2,006
Income (loss) from continuing operations before income taxes		104	20	318	272
Income tax expense		0	0	0	0
Income (loss) from continuing operations		104	20	318	272
Loss on derivative instrument					176
Gain on sale				62	$ 124
Mark to market gain (loss) on interest rate swaps		(84)		$ (186)
Operating segments | Midstream and marketing | Disposed of by sale, not discontinued operations | WES Midstream segment
Segment Information
Number of limited partner units sold (in units) | shares				10.0	11.5
Corporate and eliminations
Segment Information
Net sales		(404)	(261)	$ (1,099)	$ (758)
Income (loss) from continuing operations before income taxes		(381)	(677)	(989)	(1,603)
Income tax expense		(902)	(387)	(340)	(446)
Income (loss) from continuing operations		(1,283)	(1,064)	(1,329)	(2,049)
Mark to market gain (loss) on interest rate swaps		$ 70		332	150
Non-cash income tax benefit from reorganization				2,600
Gain (loss) on extinguishment of debt			$ (88)	143
Anadarko acquisition-related costs				$ 82	$ 122