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Commitments and Contingencies (Tables)
 12 Months Ended
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 
202225 
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:
 20212022202320242025
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.