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Leases Amounts Recognized on TVA's Consolidated Statements of Cash Flows (Details)
$ in Millions
 6 Months Ended
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