REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total Operating revenues	$ 336	$ 303
Pipeline
Disaggregation of Revenue [Line Items]
Income outside scope of ASC 606	19	21
Operating segments
Disaggregation of Revenue [Line Items]
Total Operating revenues	341	303
Operating segments \| Pipeline
Disaggregation of Revenue [Line Items]
Total Operating revenues	185	169
Operating segments \| Gathering
Disaggregation of Revenue [Line Items]
Total Operating revenues	156	134
Eliminations
Disaggregation of Revenue [Line Items]
Total Operating revenues	$ (5)	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details