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Related Party Transactions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) subsidiary	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Related Party | RENOM
Related Party Transaction
Expenses from transactions with related party	$ 82	$ 73	$ 71
Due to related party	12	13
Related Party | CEG
Related Party Transaction
Expenses from transactions with related party	6	5	5
Due to related party	5	0
Affiliated Entity | Administrative Services Agreements
Related Party Transaction
Expenses from transactions with related party	22	20	$ 16
Due to related party	$ 3	$ 2
Number of wholly owned subsidiaries | subsidiary	2

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