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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 244	$ 224	$ 484	$ 444
Pipeline
Disaggregation of Revenue [Line Items]
Total operating revenues	109	90	216	175
Revenue outside scope of ASC 606	2	2	4	3
Gathering
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 135	$ 134	$ 268	$ 269

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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