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Research and Development	3 Months Ended
	Dec. 31, 2022
Research and Development [Abstract]
Collaborative Arrangement Disclosure	19. Collaborative Arrangement In December 2022, TVA entered into a multi-party collaborative arrangement. Under the agreement, TVA will contribute up to $88 million for costs incurred through 2026. At the time feasibility is determined, TVA will have the right to use the design and receive other economic benefits. Payments pursuant to the agreement are recorded as research and development expense in the period incurred. TVA recorded $16 million of expense related to this agreement for the three months ended December 31, 2022.

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- Definition

The entire disclosure for collaborative arrangements in which the entity is a participant, including a) information about the nature and purpose of such arrangements; b) its rights and obligations thereunder; c) the accounting policy for collaborative arrangements; and d) the income statement classification and amounts attributable to transactions arising from the collaborative arrangement between participants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-URI https://asc.fasb.org/topic&trid=5833765

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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