SEGMENT INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total operating revenues	$ 1,443	$ 4,541	$ 4,830	$ 11,622
Depreciation, depletion and amortization expense	338	298	979	861
Operating income (loss)	7	2,414	556	5,844
Interest expense	36	50	106	139
Gain on derivatives	93	(1,903)	1,811	(6,709)
Gain (Loss) on Extinguishment of Debt	0	0	(19)	(6)
Other income, net	2	0	1	(1)
Provision from income taxes	21	11	28	41
Assets	12,973	13,104	12,973	13,104	$ 12,926
Capital investments	454	543	1,714	1,672
Increase (decrease) in accrued expenditures	(94)	(33)	(122)	44
Merger-related expenses	0	0	0	27
Intersegment Revenues
Segment Reporting Information [Line Items]
Total operating revenues	809	3,142	2,900	7,842
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization expense	0	0	0	0
Operating income (loss)	0	0	0	0
Interest expense	0	0	0	0
Gain on derivatives	0	0	0	(2)
Gain (Loss) on Extinguishment of Debt			(19)	(6)
Other income, net	1		1	0
Provision from income taxes	0	0	0	0
Assets	140	112	140	112
Capital investments	2	3	5	3
E&P
Segment Reporting Information [Line Items]
Total operating revenues	890	3,243	3,123	8,251
Merger-related expenses				27
E&P | Intersegment Revenues
Segment Reporting Information [Line Items]
Total operating revenues	(17)	4	(44)	(1)
E&P | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	873	3,247	3,079	8,250
Depreciation, depletion and amortization expense	337	297	975	857
Operating income (loss)	(18)	2,386	490	5,784
Interest expense	36	50	106	139
Gain on derivatives	93	(1,903)	1,811	(6,707)
Gain (Loss) on Extinguishment of Debt			0	0
Other income, net	1		0	0
Provision from income taxes	21	11	28	41
Assets	12,350	11,359	12,350	11,359
Capital investments	452	540	1,709	1,669
Marketing
Segment Reporting Information [Line Items]
Total operating revenues	553	1,298	1,707	3,371
Marketing | Intersegment Revenues
Segment Reporting Information [Line Items]
Total operating revenues	826	3,138	2,944	7,843
Marketing | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	1,379	4,436	4,651	11,214
Depreciation, depletion and amortization expense	1	1	4	4
Operating income (loss)	25	28	66	60
Interest expense	0	0	0	0
Gain on derivatives	0	0	0	0
Gain (Loss) on Extinguishment of Debt			0	0
Other income, net	0		0	(1)
Provision from income taxes	0	0	0	0
Assets	483	1,633	483	1,633
Capital investments	$ 0	$ 0	$ 0	$ 0