DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Summarized Income Statement Data (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 336			$ 314			$ 1,015	$ 926
Net Income	122	$ 116	$ 134	118	$ 111	$ 111	372	340
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Operating revenues	204			202			622	612
Operating expenses	99			97			290	295
Net Income	$ 79			$ 78			$ 253	$ 234

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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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).

+ References

+ Details

- Definition

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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