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DIVESTITURES AND ACQUISITIONS - Divestitures (Details)	1 Months Ended		2 Months Ended	10 Months Ended	12 Months Ended
	Jan. 31, 2020 USD ($)	May 31, 2019 USD ($) well	Dec. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
ACQUISITIONS AND DIVESTITURES
Working interest in Lost Hills field sold		50.00%
Total consideration of the sale of Lost Hills field 50% interest		$ 200,000,000
Proceeds from divestiture of business		$ 168,000,000
Number of well development plan included in the sale of Lost Hills field | well		200
Minimum value of well development plan of Lost Hills field		$ 35,000,000
Proceeds from sale of non-core assets	$ 41,000,000	164,000,000	$ 0	$ 41,000,000	$ 164,000,000	$ 18,000,000
Gain on asset divestitures	$ 0	$ 0	$ 0	$ 0	$ 0	$ 5,000,000

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Estimated minimum value of development program in a field that is being sold.

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The number wells to be drilled in the development program in a field that is being sold.

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The percentage of working interest sold.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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