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Commitments and Contingencies (Tables) | 12 Months Ended
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Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract] |
Schedule of lease/leaseback future minimum payments [Table Text Block] | At September 30, 2020, the future minimum payments under leaseback obligations are shown below.
Lease/Leasebacks Minimum payments due in years ending September 30
2021 |  | $ | 207 |
2022 |  | 25 |
2023 |  | — |
2024 |  | — |
2025 |  | — |
Thereafter |  | — |
Total |  | $ | 232 |
Schedule of future minimum payments for membership interests subject to mandatory redemption [Table Text Block] | At September 30, 2020, the mandatory redemptions for each of the next five years are shown below:
|  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025
Membership interests of variable interest entity subject to mandatory redemption |  | $ | 3 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 1 |
Energy Prepayment Obligations | In addition to the commitments above, TVA had contractual obligations in the form of revenue discounts related to energy prepayments. TVA recognized $10 million of prepayment obligations and related interest payments of $4 million in revenue during 2019. The arrangement ceased in 2019. See Note 1 — Summary of Significant Accounting Policies — Energy Prepayment Obligations and Note 17 — Revenue.
Unfunded loan commitments | At September 30, 2020, TVA's commitments under unfunded loan commitments were $1 million for 2021. TVA has no commitments under unfunded loan commitments for 2022 through 2025.

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