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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

ASSET IMPAIRMENTS (Details) - USD ($) $ in Millions		2 Months Ended	3 Months Ended	10 Months Ended	12 Months Ended
ASSET IMPAIRMENTS (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2020	Mar. 31, 2020	Oct. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Proved oil and natural gas properties	$ 1,487
Unproved properties	228
Other	21
Total	$ 1,736	$ 0	$ 1,700	$ 1,736	$ 0	$ 0