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Leases Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Amounts Recognized on TVA's Consolidated Statements of Cash Flows [Abstract]    
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year $ 61 $ 76
Operating Leases, Future Minimum Payments Due, Next Twelve Months 74 75
Operating Leases, Future Minimum Payments, Due in Four Years 2 3
Operating Leases, Future Minimum Payments, Due Thereafter   2
Operating Leases, Future Minimum Payments Due 207 228
Present value of future minimum lease payments, operating leases (5) 0
Operating present value of net minimum lease payments 202 228
Operating Leases, Future Minimum Payments, Due in Two Years 59 60
Operating Leases, Future Minimum Payments, Due in Three Years 11 12
Finance Lease, Liability, Payments, Remainder of Fiscal Year 40 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
Finance Lease, Liability, Payments, Due Thereafter 418 418
Finance Lease, Liability, Payment, Due 670 683
Finance Lease, Liability, Payments, Amount representing interest (484) (495)
Finance present value of net minimum lease payments $ 186 $ 188