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Leases (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Amounts Recognized on TVA's Consolidated Balance Sheet [Line Items] |  |
Finance lease, asset | $ 677 | $ 692
Finance Lease, Liability, Current | 4 | 25
Finance Lease, Liability, Noncurrent | $ 677 | $ 687

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- Definition [Line Items] for Amounts Recognized on TVA's Consolidated Balance Sheet [Table] + References No definition available. + Details
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Namespace Prefix: | tve_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Finance lease, asset + References No definition available. + Details
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Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + 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
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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
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