Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues from external customers	$ 6,667	$ 2,308	$ 3,038
Depreciation, depletion and amortization expense	546	357	471
Impairments	6	2,830	16
Operating income	2,635	(2,871)	270
Interest expense	136	94	65
Total gain (loss) on derivatives	(2,436)	224	274
Gain (Loss) on Early Extinguishment of Debt	(93)	35	8
Other income, net	5	1	(7)
Provision (benefit) for income taxes	0	407	(411)
Assets	11,848	5,160	6,717
Capital investments	1,108	899	1,140
Restructuring charges	7	16	11
Merger-related expenses	76	41	0
Increase (decrease) in accrued expenditures between periods	70	(3)	34
Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	1,963	917	1,297
Exploration and Production
Segment Reporting Information [Line Items]
Revenues from external customers	4,701	1,391	1,740
Depreciation, depletion and amortization expense			462
Merger-related expenses	76	41
Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	1,966	917	1,298
Depreciation, depletion and amortization expense			9
Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues from external customers	(4,162)	(1,185)	(1,515)
Intersegment Revenues | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	(4,223)	(1,228)	(1,552)
Intersegment Revenues | Exploration and Production
Segment Reporting Information [Line Items]
Revenues from external customers	61	43	37
Intersegment Revenues | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	(4,223)	(1,228)	(1,552)
Intersegment Revenues | Marketing | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	(4,200)	(1,200)	(1,600)
Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Revenues from external customers	4,640	1,348	1,703
Depreciation, depletion and amortization expense	537	348
Impairments	6	2,830	13
Operating income	2,583	(2,864)	283
Interest expense	136	94	65
Total gain (loss) on derivatives	(2,437)	224	274
Gain (Loss) on Early Extinguishment of Debt	0	0	0
Other income, net	5	0	(9)
Provision (benefit) for income taxes	0	407	(411)
Assets	10,767	4,654	6,235
Capital investments	1,107	899	1,138
Restructuring charges	7	16	11
Operating Segments | Exploration and Production | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	0	0	0
Operating Segments | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	6,189	2,145	2,850
Depreciation, depletion and amortization expense	9	9
Impairments	0	0	3
Operating income	52	(7)	(13)
Interest expense	0	0	0
Total gain (loss) on derivatives	0	0	0
Gain (Loss) on Early Extinguishment of Debt	0	0	0
Other income, net	0	0	0
Provision (benefit) for income taxes	0	0	0
Assets	956	381	314
Capital investments	0	0	0
Operating Segments | Marketing | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	6,186	2,145	2,849
Operating Segments | Marketing | Non Core Gathering Assets
Segment Reporting Information [Line Items]
Impairments			3
Other
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization expense	0	0	0
Impairments	0	0	0
Operating income	0	0	0
Interest expense	0	0	0
Total gain (loss) on derivatives	1	0	0
Gain (Loss) on Early Extinguishment of Debt	(93)	35	8
Other income, net	0	1	2
Provision (benefit) for income taxes	0	0	0
Assets	125	125	168
Capital investments	$ 1	$ 0	$ 2