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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

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- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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