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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Summarized Income Statement Data (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 314			$ 248			$ 926	$ 732
Net Income	118	$ 111	$ 111	91	$ 100	$ 100	340	291
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Operating revenues	202			201			612	613
Operating expenses	97			95			295	283
Net Income	$ 78			$ 86			$ 234	$ 280

X

- Definition

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

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