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GENERAL - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Summary of Significant Accounting Policies [Line Items]
Limited partner interest		49.50%
Non-voting limited partner interest		2.00%
Land
Summary of Significant Accounting Policies [Line Items]
Impairment and related charges	$ 180	$ 180
WES Midstream segment
Summary of Significant Accounting Policies [Line Items]
Effective economic interest		51.60%
Black Butte Coal
Summary of Significant Accounting Policies [Line Items]
Impairment of equity method investment	$ 29	$ 29
WES Midstream segment
Summary of Significant Accounting Policies [Line Items]
Non-voting general partner interest		2.30%

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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