Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total operating revenues	$ 4,138	$ 1,050	$ 7,081	$ 2,122
Depreciation, depletion and amortization expense	288	100	563	196
Operating income	2,131	293	3,430	594
Interest expense	48	30	89	61
Loss on derivatives	(879)	(871)	(4,806)	(1,062)
Loss on extinguishment of debt	(4)	0	(6)	0
Other income (loss), net	(1)	(1)	(1)	0
Assets	12,932	5,394	12,932	5,394	$ 11,848
Capital investments	585	259	1,129	525
Restructuring charges	0	1	0	7
Merger-related expenses	2	3	27	4
Increase (decrease) in accrued expenditures	34	(9)	77	29
Benefit from income taxes	26	0	30	0
Intersegment Revenues
Segment Reporting Information [Line Items]
Total operating revenues	2,814	637	4,700	1,267
E&P
Segment Reporting Information [Line Items]
Total operating revenues	2,931	718	5,008	1,437
Depreciation, depletion and amortization expense	286	97	560	191
Operating income	2,120	286	3,398	581
Interest expense	48	30	89	61
Loss on derivatives	(879)	(872)	(4,804)	(1,063)
Loss on extinguishment of debt	0		0
Other income (loss), net	0	(1)	0
Assets	11,115	4,870	11,115	4,870
Capital investments	585	259	1,129	525
Restructuring charges		1		7
Merger-related expenses	2	3	27	4
Benefit from income taxes	26		30
E&P | Intersegment Revenues
Segment Reporting Information [Line Items]
Total operating revenues	(2)	(14)	(5)	(28)
Marketing
Segment Reporting Information [Line Items]
Total operating revenues	1,207	332	2,073	685
Depreciation, depletion and amortization expense	2	3	3	5
Operating income	11	7	32	13
Interest expense	0	0	0	0
Loss on derivatives	0	0	0	0
Loss on extinguishment of debt	0		0
Other income (loss), net	(1)	0	(1)
Assets	1,664	408	1,664	408
Capital investments	0	0	0	0
Benefit from income taxes	0		0
Marketing | Intersegment Revenues
Segment Reporting Information [Line Items]
Total operating revenues	2,816	651	4,705	1,295
Other
Segment Reporting Information [Line Items]
Total operating revenues	0	0	0	0
Depreciation, depletion and amortization expense	0	0	0	0
Operating income	0	0	0	0
Interest expense	0	0	0	0
Loss on derivatives	0	1	(2)	1
Loss on extinguishment of debt	(4)		(6)
Other income (loss), net	0	0	0
Assets	153	116	153	116
Capital investments	0	0	0	0
Benefit from income taxes	0		0
Other | Intersegment Revenues
Segment Reporting Information [Line Items]
Total operating revenues	$ 0	$ 0	$ 0	$ 0