INDUSTRY SEGMENTS AND GEOGRAPHIC AREAS - RESULTS OF OPERATIONS (Details) shares in Millions, $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2021 USD ($) shares	Mar. 31, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment					3
Segment Information
Net sales					$ 25,956	$ 17,809	$ 20,911
Income (loss) from continuing operations before income taxes					3,705	(15,705)	354
Income tax (expense) benefit					(915)	2,172	(861)
Income (loss) from continuing operations					2,790	(13,533)	(507)
Investments in unconsolidated entities	$ 2,938				2,938	3,250	6,389
Property, plant and equipment additions					2,931	2,619	6,453
Depreciation, depletion and amortization					8,447	8,097	6,140
Total assets	$ 75,036				75,036	80,064	107,190
Gains (losses) on interest rate swaps and warrants, net					122	(423)	233
Impairment and related charges			$ 8,600				285
Anadarko Acquisition-related costs					153	339	1,647
Employee severance and related costs							1,000
Crucial seismic data							401
Bank, legal and consulting fees							213
Pre-tax adjustment expense (benefit)					$ 200	(1,900)	(245)
WES | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Information
Gain on sale		$ 102
Number of shares sold (in shares) | shares	2.5	11.5			14.0
Goodwill derecognized				$ 1,200
Oil and gas
Segment Information
Impairment and related charges			$ 6,400	$ 581
Operating segments | Oil and gas
Segment Information
Net sales					$ 18,941	13,066	13,941
Income (loss) from continuing operations before income taxes					4,145	(9,632)	2,520
Income tax (expense) benefit					0	0	0
Income (loss) from continuing operations					4,145	(9,632)	2,520
Investments in unconsolidated entities	$ 154				154	168	181
Property, plant and equipment additions					2,458	2,279	5,571
Depreciation, depletion and amortization					7,741	7,414	5,153
Total assets	56,132				56,132	62,931	80,093
Pre-tax impairment charges					282		285
Gains (losses) on interest rate swaps and warrants, net					(280)	1,100
Impairment and related charges						7,100
Pre-tax loss on sale of properties						1,600
Gain on sale related to joint venture							475
Pre-tax impairment and related charges on domestic undeveloped leases							39
Operating segments | Chemical
Segment Information
Net sales					5,246	3,733	4,102
Income (loss) from continuing operations before income taxes					1,544	664	799
Income tax (expense) benefit					0	0	0
Income (loss) from continuing operations					1,544	664	799
Investments in unconsolidated entities	608				608	645	689
Property, plant and equipment additions					316	261	272
Depreciation, depletion and amortization					343	356	368
Total assets	4,671				4,671	4,326	4,361
Operating segments | Midstream and marketing
Segment Information
Net sales					2,863	1,768	4,132
Income (loss) from continuing operations before income taxes					257	(4,175)	241
Income tax (expense) benefit					0	0	0
Income (loss) from continuing operations					257	(4,175)	241
Investments in unconsolidated entities	2,176				2,176	2,437	5,519
Property, plant and equipment additions					107	50	475
Depreciation, depletion and amortization					325	312	563
Total assets	11,132				11,132	9,856	14,915
Operating segments | Midstream and marketing | Plains All American Pipeline, LP | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Information
Pre-tax gain on sale of equity investment							114
Operating segments | Midstream and marketing | WES | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Information
Gains (losses) on interest rate swaps and warrants, net					(252)
Gain on sale					$ 124
Number of shares sold (in shares) | shares					11.5
Impairment of equity method investment						2,700
Goodwill derecognized						1,400
Equity method investment, loss from goodwill impairment						236
Charge upon loss of control							1,000
Operating segments | Midstream and marketing | Interest Rate Swaps | WES | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Information
Mark to market gain on interest rate swap							30
Corporate and eliminations
Segment Information
Net sales					$ (1,094)	(758)	(1,264)
Income (loss) from continuing operations before income taxes					(2,241)	(2,562)	(3,206)
Income tax (expense) benefit					(915)	2,172	(861)
Income (loss) from continuing operations					(3,156)	(390)	(4,067)
Investments in unconsolidated entities	0				0	0	0
Property, plant and equipment additions					50	29	135
Depreciation, depletion and amortization					38	15	56
Total assets	$ 3,101				3,101	2,951	$ 7,821
Anadarko Acquisition-related costs					153	339
Mark to market gain (loss) on interest rate swaps					122	$ (428)
Early debt extinguishment expenses					$ 118