SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Asset Impairments Recorded in Connection with Fair Value Assessments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule Of Significant Accounting Policies [Line Items]
Goodwill	$ 0	$ 87	$ 0	$ 87	$ 0
Divested unproved properties and leasehold	0		149	0	149
Inventory and other	0		5	18	5
Total Impairments	20	4,500	240	4,492	240
Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Tangible asset impairment charges	20		86	4,319	86
Gathering, processing, and transmission facilities
Schedule Of Significant Accounting Policies [Line Items]
Tangible asset impairment charges	$ 0		$ 0	$ 68	$ 0
Total Impairments		$ 68

Inventory And Other, Impairments

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Schedule Of Significant Accounting Policies [Line Items]

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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