DERIVATIVES - Schedule of Gain (Loss) On Natural Gas Purchase Derivatives (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Non-cash gain on natural gas purchase derivatives	$ (18)	$ (1)
Settlements	12	2
Net (gain) loss on natural gas purchase derivatives	$ (6)	$ 1

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration