Business, Basis of Presentation, and Summary of Significant Accounting Policies (Details)	Mar. 31, 2026 GW
Property, Plant and Equipment [Line Items]
Generation capacity	13.1
Nuclear fuel
Property, Plant and Equipment [Line Items]
Generation capacity	2.2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

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