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Summary of Significant Accounting Policies Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Pre-commercial Ops - capitalized revenue	$ 0	$ (3)
Paradise CT Units 5-7
Property, Plant and Equipment [Line Items]
Pre-commercial Ops - capitalized revenue		3
Pre-commercial Ops - Capitalized Fuel		$ 3
Johnsonville Aeroderivative CT Units 25-28
Property, Plant and Equipment [Line Items]
Pre-commercial Ops - capitalized revenue	1
Pre-commercial Ops - Capitalized Fuel	$ 1

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+ References

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- Definition

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.

+ References

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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