Segments - Schedule of Industry Segments and Eliminations (Details) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) site shares	Mar. 31, 2021 USD ($)
Segment Information
Number of operating segments | site	3
Net sales	$ 8,349	$ 5,293
Income (loss) from continuing operations before income taxes	3,083	315
Income tax benefit (expense)	1,793	(16)
Income (loss) from continuing operations	4,876	299
Anadarko acquisition-related costs	65	41
Operating segments | Oil and gas
Segment Information
Net sales	6,075	3,664
Income (loss) from continuing operations before income taxes	2,898	(62)
Income tax benefit (expense)	0	0
Income (loss) from continuing operations	2,898	(62)
Impairment charge		135
Operating segments | Oil and gas | Disposed of by sale, not discontinued operations | Permian Basin
Segment Information
Gain on sale	125
Operating segments | Chemical
Segment Information
Net sales	1,684	1,088
Income (loss) from continuing operations before income taxes	671	251
Income tax benefit (expense)	0	0
Income (loss) from continuing operations	671	251
Operating segments | Midstream and marketing
Segment Information
Net sales	882	807
Income (loss) from continuing operations before income taxes	(50)	282
Income tax benefit (expense)	0	0
Income (loss) from continuing operations	(50)	282
Mark to market gain (loss) on interest rate swaps	198
Operating segments | Midstream and marketing | Disposed of by sale, not discontinued operations | WES Midstream segment
Segment Information
Gain on sale	$ 102
Number of limited partner units sold (in units) | shares	11.5
Proceeds from sale of limited partner units	$ 200
Corporate and eliminations
Segment Information
Net sales	(292)	(266)
Income (loss) from continuing operations before income taxes	(436)	(156)
Income tax benefit (expense)	1,793	(16)
Income (loss) from continuing operations	1,357	(172)
Mark to market gain (loss) on interest rate swaps	135	399
Non-cash income tax benefit from reorganization	2,600
Anadarko acquisition-related costs	$ 65	$ 41