GENERAL - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Summary of Significant Accounting Policies [Line Items]
Limited partner interest	48.70%
Non-voting limited partner interest	2.00%
Variable Interest Entity, Primary Beneficiary
Summary of Significant Accounting Policies [Line Items]
Construction in progress	$ 432
BlackRock, Inc.
Summary of Significant Accounting Policies [Line Items]
Equity method investment commitments		$ 550
WES Midstream segment
Summary of Significant Accounting Policies [Line Items]
Effective economic interest	50.90%
WES Midstream segment
Summary of Significant Accounting Policies [Line Items]
Non-voting general partner interest	2.30%