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Investments Accounted for by the Equity Method and Variable Interest Entities - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 301	$ 309	$ 322
Avenal
Schedule of Equity Method Investments [Line Items]
Economic Interest	50.00%
Investment Balance	$ 11
Desert Sunlight
Schedule of Equity Method Investments [Line Items]
Economic Interest	25.00%
Investment Balance	$ 222
Elkhorn Ridge
Schedule of Equity Method Investments [Line Items]
Economic Interest	66.70%
Investment Balance	$ (2)
GenConn
Schedule of Equity Method Investments [Line Items]
Economic Interest	50.00%
Investment Balance	$ 72
San Juan Mesa
Schedule of Equity Method Investments [Line Items]
Economic Interest	75.00%
Investment Balance	$ (2)

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

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.

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