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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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