REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Total Operating revenues	$ 336	$ 314	$ 1,015	$ 926
Pipeline
Disaggregation of Revenue [Line Items]
Income outside scope of ASC 606	18	18	55	60
Operating segments
Disaggregation of Revenue [Line Items]
Total Operating revenues	343	314	1,035	926
Operating segments \| Pipeline
Disaggregation of Revenue [Line Items]
Total Operating revenues	182	169	550	514
Operating segments \| Gathering
Disaggregation of Revenue [Line Items]
Total Operating revenues	161	145	485	412
Eliminations
Disaggregation of Revenue [Line Items]
Total Operating revenues	$ (7)	$ 0	$ (20)	$ 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