SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Asset Impairments Recorded in Connection with Fair Value Assessments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Significant Accounting Policies [Line Items]
Goodwill	$ 0	$ 87,000,000
Inventory and other	0	18,000,000
Total Impairments	0	4,472,000,000
Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Tangible asset impairment charges	0	4,299,000,000
Gathering, processing, and transmission facilities
Schedule Of Significant Accounting Policies [Line Items]
Tangible asset impairment charges	$ 0	68,000,000
Total Impairments		$ 68,000,000