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Leases Future Minimum Lease Payments (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Sep. 30, 2019
Amounts Recognized on TVA's Consolidated Statements of Cash Flows [Abstract] |  |
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year | $ 38 | $ 76
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 106 | 75
Operating Leases, Future Minimum Payments, Due in Four Years | 35 | 3
Operating Leases, Future Minimum Payments, Due Thereafter | 44 | 2
Operating Leases, Future Minimum Payments Due | 357 | 228
Present value of future minimum lease payments, operating leases | 12 | 0
Operating present value of net minimum lease payments | 345 | 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 | 14 | 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 | 56 | 55
Finance Lease, Liability, Payments, Due Year Four | 52 | 51
Purchased Power Lease | 89 |
Finance Lease, Liability, Payments, Amount representing interest | 460 | 495
Finance present value of net minimum lease payments | $ 186 | $ 188

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- Definition Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121609121&loc=SL77918701-209980 + Details
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