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Leases Amounts Recognized on TVA's Consolidated Statements of Cash Flows (Details) $ in Millions | 6 Months Ended
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Mar. 31, 2020 USD ($)
Amounts Recognized on TVA's Consolidated Statements of Cash Flows [Abstract] |
Operating cash flows for operating leases | $ 36
Operating cash flows for finance leases | 15
Financing cash flows for finance leases | 0
Lease assets obtained in exchange for lease obligations (non-cash) - Operating | 186
Lease assets obtained in exchange for lease obligations (non-cash) - Finance | $ 0

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