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Leases (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 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 | 354 |  | 354 |  |  |
Finance lease, asset | 140 |  | 140 |  |  |
Lease assets | 494 |  | 494 |  |  |
Operating Lease, Liability, Current | 101 |  | 101 |  |  | 0
Finance Lease, Liability, Current | 6 |  | 6 |  |  |
Operating Lease, Liability, Noncurrent | 262 |  | 262 |  |  |
Finance Lease, Liability, Noncurrent | 179 |  | 179 |  |  |
Lease liabilities | 548 |  | 548 |  |  |
Purchased Power Lease |  |  | 89 |  |  |
Finance Lease, Liability, Payment, Due | 657 |  | 657 |  |  | $ 683
Operating Lease, Asset |  |  |  |  | $ 205 |
Operating Lease, Liability |  |  |  |  | $ 210 |
Short-term Lease, Cost | $ 3 |  | $ 3 |  |  |
Operating Leases, Rent Expense |  | $ 18 |  | $ 36 |  |

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