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Commitments and Contingencies Commitments and Contingencies (Tables) | 12 Months Ended
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Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of lease/leaseback future minimum payments [Table Text Block] | At September 30, 2018, the future minimum payments under leaseback obligations are shown below.
Lease/Leasebacks Minimum payments due in years ending September 30
2019 |  | $ | 49 |
2020 |  | 50 |
2021 |  | 207 |
2022 |  | 25 |
2023 |  | — |
Thereafter |  | — |
Total |  | $ | 331 |
Schedule of future minimum payments for membership interests subject to mandatory redemption [Table Text Block] | At September 30, 2018, the mandatory redemptions for each of the next five years are shown below:
|  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Membership interests of variable interest entity subject to mandatory redemption |  | $ | 2 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | 2 |
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | At September 30, 2018, the future minimum lease payments under operating leases, including purchased power agreements that are accounted for as operating leases, are shown below.
Operating Leases Minimum payments due in years ending September 30
2019 |  | $ | 69 |
2020 |  | 64 |
2021 |  | 62 |
2022 |  | 47 |
2023 |  | 7 |
Thereafter |  | 1 |
Total |  | $ | 250 |
Energy Prepayment Obligations | In addition to the commitments above, TVA has contractual obligations in the form of revenue discounts related to energy prepayments. TVA will recognize $10 million of prepayment obligations and related interest payments of $4 million in revenue during 2019. No prepayment obligations or related interest payments will be recognized in revenue from 2020 through 2023. See Note 1 — Energy Prepayment Obligations.
Unfunded loan commitments | At September 30, 2018, TVA's commitments under unfunded loan commitments is $3 million for 2019. TVA has no commitments under unfunded loan commitments for 2020 through 2023.
Schedule of Future Minimum Lease Payments for Capital Leases | At September 30, 2018, the future minimum lease payments under capital leases shown below were included as Capital leases and Other long-term liabilities on TVA's consolidated balance sheet.
Capital Leases Minimum payments due in years ending September 30
2019 |  | $ | 51 |
2020 |  | 51 |
2021 |  | 51 |
2022 |  | 51 |
2023 |  | 51 |
Thereafter |  | 468 |
Minimum annual payments |  | 723 |
Less: amount representing interest |  | (541 | )
Total |  | $ | 182 |

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- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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