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Related Party Transactions (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) subsidiary	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) subsidiary	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Related Party Transaction
General and administrative expense	$ 10	$ 9	$ 31	$ 29
Related Party | RENOM
Related Party Transaction
Expenses from transactions with related party	20	22	61	59
Due to related party	10		10		$ 12
Related Party | CEG
Related Party Transaction
General and administrative expense	6	1	18	4
Affiliated Entity | Administrative Services Agreement
Related Party Transaction
Expenses from transactions with related party	8	$ 5	19	$ 17
Due to related party	$ 3		$ 3		3
Number of wholly owned subsidiaries | subsidiary	2		2
Affiliated Entity | CEG
Related Party Transaction
Due to related party	$ 0		$ 0		$ 5

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