REVENUE RECOGNITION - Disaggregation of Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,083	$ 1,269	$ 2,500	$ 3,387
E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	659	794	1,497	2,233
Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	424	475	1,003	1,154
Operating Segments | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	642	777	1,466	2,206
Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	1,057	1,231	2,434	3,272
Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	(616)	(739)	(1,400)	(2,091)
Intersegment Revenues | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	17	17	31	27
Intersegment Revenues | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	(633)	(756)	(1,431)	(2,118)
Gas sales
Disaggregation of Revenue [Line Items]
Total operating revenues	411	551	995	1,696
Gas sales | Operating Segments | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	395	535	966	1,671
Gas sales | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0	0
Gas sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	16	16	29	25
Oil sales
Disaggregation of Revenue [Line Items]
Total operating revenues	90	92	172	187
Oil sales | Operating Segments | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	89	91	170	185
Oil sales | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0	0
Oil sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	1	1	2	2
NGL sales
Disaggregation of Revenue [Line Items]
Total operating revenues	158	153	332	354
NGL sales | Operating Segments | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	158	153	332	354
NGL sales | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0	0
NGL sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0	0
Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	424	475	1,003	1,154
Marketing | Operating Segments | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0	0
Marketing | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	1,057	1,231	2,434	3,272
Marketing | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	(633)	(756)	(1,431)	(2,118)
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 0	(2)	(2)	(4)
Other | Operating Segments | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues		(2)	(2)	(4)
Other | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues		0	0	0
Other | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		$ 0	$ 0	$ 0