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Subsequent Events (Notes)	12 Months Ended
	Sep. 30, 2022
Subsequent Events [Abstract]
Subsequent Events [Text Block]	. Subsequent Events Valuation Changes in Derivative Transactions As of November xx, 2022, TVA’s interest rate swap derivative liability and related regulatory asset for unrealized losses are estimated to decrease approximately $120 million compared to September 30, 2022, due to increases in market interest rates. As of November xx, 2022, TVA’s commodity contract derivative asset and related regulatory liability for unrealized gains are estimated to decrease approximately $48 million compared to September 30, 2022. The commodity derivative liability and related regulatory asset for unrealized losses are estimated to decrease $2 million compared to September 30, 2022. TVA's commodity derivative asset under the FHP and related regulatory liability for unrealized gains are estimated to decrease approximately $50 million compared to September 30, 2022. TVA’s commodity derivative liability under the FHP and related regulatory asset for unrealized losses is estimated to increase approximately $27 million compared to September 30, 2022. These changes are primarily due to recent decreases in natural gas prices.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI https://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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