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Leases (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Oct. 01, 2019 | Sep. 30, 2019
Amounts Recognized on TVA's Consolidated Balance Sheet [Line Items] |  |  |  |  |  |
Finance Lease, Liability, Payments, Due Thereafter | $ 418 |  | $ 418 |  |  | $ 418
Operating lease assets, net of amortization | 332 |  | 332 |  |  |
Finance lease, asset | 139 |  | 139 |  |  |
Lease assets | 471 |  | 471 |  |  |
Operating Lease, Liability, Current | 101 |  | 101 |  |  | 0
Finance Lease, Liability, Current | 6 |  | 6 |  |  |
Operating Lease, Liability, Noncurrent | 244 |  | 244 |  |  |
Finance Lease, Liability, Noncurrent | 180 |  | 180 |  |  |
Lease liabilities | 531 |  | 531 |  |  |
Purchased Power Lease |  |  | 89 |  |  |
Finance Lease, Liability, Payment, Due | 646 |  | 646 |  |  | $ 683
Operating Lease, Asset |  |  |  |  | $ 205 |
Operating Lease, Liability |  |  |  |  | $ 210 |
Short-term Lease, Cost | $ 2 |  | $ 5 |  |  |
Operating Leases, Rent Expense |  | $ 18 |  | $ 54 |  |

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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=121603541&loc=SL77918627-209977 + Details
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