Asset Retirement Obligations and Accrued Environmental Costs - Schedule of Asset Retirement Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Asset Retirement Obligation [Line Items]
Asset retirement obligations	$ 495	$ 464
Nuclear fuel
Asset Retirement Obligation [Line Items]
Asset retirement obligations	234	214
Non-Nuclear
Asset Retirement Obligation [Line Items]
Asset retirement obligations	$ 261	$ 250

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481999/410-20-25-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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