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Leases (Details) - USD ($) $ in Millions	Jun. 30, 2021	Sep. 30, 2020
Amounts Recognized on TVA's Consolidated Balance Sheet [Line Items]
Finance Lease, Liability, Noncurrent	$ 709	$ 525

X

- Definition

[Line Items] for Amounts Recognized on TVA's Consolidated Balance Sheet [Table]

+ References

No definition available.

+ Details

Name:	tve_AmountsRecognizedonTVAsConsolidatedBalanceSheetLineItems
Namespace Prefix:	tve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

Name:	us-gaap_FinanceLeaseLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant