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Leases Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Amounts Recognized on TVA's Consolidated Statements of Cash Flows [Abstract]    
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year $ 59 $ 76
Operating Leases, Future Minimum Payments Due, Next Twelve Months 105 75
Operating Leases, Future Minimum Payments, Due in Four Years 35 3
Operating Leases, Future Minimum Payments, Due Thereafter 43 2
Operating Leases, Future Minimum Payments Due 376 228
Present value of future minimum lease payments, operating leases (13) 0
Operating present value of net minimum lease payments 363 228
Operating Leases, Future Minimum Payments, Due in Two Years 91 60
Operating Leases, Future Minimum Payments, Due in Three Years 43 12
Finance Lease, Liability, Payments, Remainder of Fiscal Year 27 53
Finance Lease, Liability, Payments, Due Next Twelve Months 53 53
Finance Lease, Liability, Payments, Due Year Two 53 53
Finance Lease, Liability, Payments, Due Year Three 55 55
Finance Lease, Liability, Payments, Due Year Four 51 51
Purchased Power Lease 89  
Finance Lease, Liability, Payments, Amount representing interest (472) (495)
Finance present value of net minimum lease payments $ 185 $ 188