INVESTMENT IN UNCONSOLIDATED SUBSIDIARIES AND RELATED PARTY TRANSACTIONS - Schedule of Changes Investments in Unconsolidated Subsidiaries (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Equity Method Investments [Roll Forward]
Beginning balance			$ 111
Net (loss) income	$ (1)	$ (2)	(5)	$ (3)
Ending balance	98		98
Carbon TerraVault JV
Equity Method Investments [Roll Forward]
Beginning balance			57	27
Net (loss) income	(1)	(2)	(4)	(4)
Contributions (distributions)			2	26
Adjustment to the preliminary purchase price allocation				0
Ending balance	55	49	55	49
Midway Sunset Cogeneration Company
Equity Method Investments [Roll Forward]
Beginning balance			54	59
Net (loss) income			(1)	1
Contributions (distributions)			(10)	0
Adjustment to the preliminary purchase price allocation				(7)
Ending balance	$ 43	$ 53	$ 43	$ 53

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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