Industry Segments - Schedule of Industry Segments and Eliminations (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Segment Information
Number of operating segments | segment	3
Net sales	$ 6,410	$ 4,004
Income (loss) from continuing operations before income taxes	(2,095)	856
Income tax benefit	82	(225)
Income (loss) from continuing operations	(2,013)	631
Gain on derivative instrument	(585)	0
Goodwill impairment	1,200
Anadarko acquisition-related costs	148	0
Operating Segments | Oil and Gas
Segment Information
Net sales	4,857	2,351
Income (loss) from continuing operations before income taxes	179	484
Income tax benefit	0	0
Income (loss) from continuing operations	179	484
Impairments	317
Gain on derivative instrument	952
Asset impairments	264
Operating Segments | Chemical
Segment Information
Net sales	962	1,059
Income (loss) from continuing operations before income taxes	186	265
Income tax benefit	0	0
Income (loss) from continuing operations	186	265
Operating Segments | Midstream and Marketing
Segment Information
Net sales	790	816
Income (loss) from continuing operations before income taxes	(1,287)	279
Income tax benefit	0	0
Income (loss) from continuing operations	(1,287)	279
Goodwill impairment	1,400
Corporate and Eliminations
Segment Information
Net sales	(199)	(222)
Income (loss) from continuing operations before income taxes	(1,173)	(172)
Income tax benefit	82	(225)
Income (loss) from continuing operations	(1,091)	$ (397)
Gain on derivative instrument	84
Anadarko acquisition-related costs	148
Loss on interest rate swaps	$ 669