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Subsequent Event (Notes)	9 Months Ended
	Jun. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Redemption of Power Bonds On June 15, 2020, TVA provided notice of its intent to redeem on July 15, 2020, all of its 6.235 percent 1995 Series B Power Bonds (CUSIP number 880591CF7) due July 15, 2045. The bonds, with a principal amount outstanding of $140 million, were redeemed at 100 percent of par value. United States Credit Rating On July 31, 2020, Fitch Ratings affirmed the United States' Long-Term Foreign-Currency, Local-Currency, and Issuer Default Ratings ("credit ratings") at AAA, but revised the ratings outlooks from stable to negative. The change in outlooks on the United States’ credit ratings is expected to result in a similar action by Fitch Ratings on the outlook for TVA’s credit ratings. Federal Contracting and Hiring Practices On August 3, 2020, President Trump issued an "Executive Order ("EO") on Aligning Federal Contracting and Hiring Practices With the Interests of American Workers." Among other things, the EO directs federal agencies to review their contracting and hiring practices and assess negative impacts from the use of temporary foreign labor or offshoring of work. TVA is reviewing this EO and has not yet determined the extent to which this EO may impact TVA’s operations.

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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 http://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 http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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