Investments Accounted for by the Equity Method and Variable Interest Entities - Summary of Equity Method Investments and Undistributed Earnings (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments Accounted for by the Equity Method
Equity investments in affiliates	$ 16	$ 45	$ 16	$ 45
Impairment losses on investments			39	7	$ 102
Undistributed earnings from equity investment	$ 9	5	$ 9	$ 5
Gladstone
Investments Accounted for by the Equity Method
Economic interest in equity method investments (as a percent)	37.50%		37.50%
Equity investments in affiliates	$ 0		$ 0
Impairment losses on investments	$ 39	$ 7	$ 39
Midway-Sunset Cogeneration Company
Investments Accounted for by the Equity Method
Economic interest in equity method investments (as a percent)	50.00%		50.00%
Equity investments in affiliates	$ 16		$ 16