Nuclear Decommissioning Trust Funds - Summary of the Sale Proceeds, Gains, and Losses for Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	5 Months Ended	7 Months Ended	12 Months Ended
May 17, 2023	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Sales proceeds of NDT funds investments	$ 839	$ 1,259	$ 2,132	$ 2,081
Gross realized gains	7	5	12	10
Gross realized losses	$ (12)	$ (11)	$ (13)	$ (43)

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration