REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total Operating revenues	$ 343	$ 309	$ 679	$ 612
Pipeline
Disaggregation of Revenue [Line Items]
Income outside scope of ASC 606	18	20	37	41
Operating segments
Disaggregation of Revenue [Line Items]
Total Operating revenues	351	309	692	612
Operating segments \| Pipeline
Disaggregation of Revenue [Line Items]
Total Operating revenues	183	176	368	345
Operating segments \| Gathering
Disaggregation of Revenue [Line Items]
Total Operating revenues	168	133	324	267
Eliminations
Disaggregation of Revenue [Line Items]
Total Operating revenues	$ (8)	$ 0	$ (13)	$ 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