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Leases (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Amounts Recognized on TVA's Consolidated Balance Sheet [Line Items] |  |
Finance lease, asset | $ 702 | $ 729
Operating Lease, Liability, Current | 65 | 63
Operating Lease, Liability, Noncurrent | $ 80 | $ 88

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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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- Definition Finance lease, asset + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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