Segment Information (Schedule of Summarized Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues from external customers	$ 6,522	$ 15,002	$ 6,667
Depreciation, depletion and amortization expense	1,307	1,174	546
Impairments	1,710	0	6
Operating income (loss)	(974)	7,354	2,635
Interest expense	142	184	136
Total gain (loss) on derivatives	2,433	(5,259)	(2,436)
Loss on Early Extinguishment of Debt	(19)	(14)	(93)
Other income, net	2	3	5
Provision (benefit) for income taxes	(257)	51	0
Assets	11,991	12,926	11,848
Capital investments	2,131	2,209	1,108
Increase (decrease) in accrued expenditures between periods	(44)	88	70
Merger-related expenses	0	27	76
Restructuring charges	0	0	7
Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	2,355	4,419	1,963
Exploration and Production
Segment Reporting Information [Line Items]
Revenues from external customers	4,167	10,583	4,701
Merger-related expenses		27	76
Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	2,355	4,419	1,966
Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues from external customers	3,864	10,096	4,162
Intersegment Revenues | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	3,922	10,102	4,223
Intersegment Revenues | Exploration and Production
Segment Reporting Information [Line Items]
Revenues from external customers	(58)	(6)	(61)
Intersegment Revenues | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	3,922	10,102	4,223
Intersegment Revenues | Marketing | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	(3,900)	(10,100)	(4,200)
Operating Segments
Segment Reporting Information [Line Items]
Revenues from external customers	6,522
Depreciation, depletion and amortization expense	1,307	1,174	546
Impairments	1,710		6
Operating income (loss)	(969)	7,354	2,635
Interest expense	142	184	136
Total gain (loss) on derivatives	2,433	(5,257)	(2,437)
Loss on Early Extinguishment of Debt	0	0	0
Other income, net	2	3	5
Provision (benefit) for income taxes	(257)	51	0
Assets	11,844	12,747	11,723
Capital investments	2,122	2,196	1,107
Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Revenues from external customers	4,109	10,577	4,640
Depreciation, depletion and amortization expense	1,302	1,169	537
Impairments	1,710		6
Operating income (loss)	(1,061)	7,253	2,583
Interest expense	142	184	136
Total gain (loss) on derivatives	2,433	(5,257)	(2,437)
Loss on Early Extinguishment of Debt	0	0	0
Other income, net	2	3	5
Provision (benefit) for income taxes	(257)	51	0
Assets	11,253	11,473	10,767
Capital investments	2,122	2,196	1,107
Restructuring charges			7
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	6,277	14,521	6,189
Depreciation, depletion and amortization expense	5	5	9
Impairments	0		0
Operating income (loss)	92	101	52
Interest expense	0	0	0
Total gain (loss) on derivatives	0	0	0
Loss on Early Extinguishment of Debt	0	0	0
Other income, net	0	0	0
Provision (benefit) for income taxes	0	0	0
Assets	591	1,274	956
Capital investments	0	0	0
Operating Segments | Marketing | Marketing
Segment Reporting Information [Line Items]
Revenues from external customers	6,277	14,521	6,186
Other
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization expense	0	0	0
Impairments	0		0
Operating income (loss)	(5)	0	0
Interest expense	0	0	0
Total gain (loss) on derivatives	0	(2)	1
Loss on Early Extinguishment of Debt	(19)	(14)	(93)
Other income, net	0	0	0
Provision (benefit) for income taxes	0	0	0
Assets	147	179	125
Capital investments	$ 9	$ 13	$ 1