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

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- 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

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- 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