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Subsequent Event (Notes)	3 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	21. Subsequent Events Valuation Changes in Derivative Transactions As of January 30, 2023, TVA's interest rate swap derivative liability and related regulatory asset for unrealized losses are estimated to increase approximately $90 million compared to December 31, 2022, due to decreases in long-term market interest rates. As of January 30, 2023, TVA's commodity derivative liability under the FHP and related regulatory asset for unrealized losses are estimated to increase approximately $175 million compared to December 31, 2022, 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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