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Revenue (Tables) | 12 Months Ended
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Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Revenues | Revenues TVA recognizes revenue from contracts with customers to depict the transfer of goods or services to customers in an amount to which the entity expects to be entitled in exchange for those goods or services. For the generation and transmission of electricity, this is generally at the time the power is delivered to a metered customer delivery point for the customer's consumption or distribution. As a result, revenues from power sales are recorded as electricity is delivered to customers. In addition to power sales invoiced and recorded during the month, TVA accrues estimated unbilled revenues for power sales provided to five customers whose billing date occurs prior to the end of the month. Exchange power sales are presented in the accompanying Consolidated Statements of Operations as a component of sales of electricity. Exchange power sales are sales of excess power after meeting TVA native load and directly served requirements. Native load refers to the customers on whose behalf a company, by statute, franchise, regulatory requirement, or contract, has undertaken an obligation to serve. TVA engages in other arrangements in addition to power sales. Certain other revenue from activities related to TVA's overall mission is recorded in Other revenue. Revenues that are not related to the overall mission are recorded in Other income (expense), net.
Disaggregation of Revenue [Table Text Block] | Disaggregated Revenues During 2021, revenues generated from TVA's electricity sales were $10.4 billion and accounted for virtually all of TVA's revenues. TVA's operating revenues by state for each of the last three years are detailed in the table below:
Operating Revenues By State For the years ended September 30 (in millions)
| 2021 |  | 2020 |  | 2019
Alabama | $ | 1,508 |  |  | $ | 1,439 |  |  | $ | 1,593 |
Georgia | 254 |  |  | 249 |  |  | 270 |
Kentucky | 655 |  |  | 624 |  |  | 691 |
Mississippi | 984 |  |  | 941 |  |  | 1,063 |
North Carolina | 66 |  |  | 65 |  |  | 74 |
Tennessee | 6,841 |  |  | 6,740 |  |  | 7,419 |
Virginia | 42 |  |  | 42 |  |  | 45 |
Subtotal | 10,350 |  |  | 10,100 |  |  | 11,155 |
Off-system sales | 7 |  |  | 4 |  |  | 4 |
Revenue from sales of electricity | 10,357 |  |  | 10,104 |  |  | 11,159 |
Other revenue | 146 |  |  | 145 |  |  | 159 |
Total operating revenues | $ | 10,503 |  |  | $ | 10,249 |  |  | $ | 11,318 |
TVA's operating revenues by customer type for each of the last three years are detailed in the table below:
Operating Revenues by Customer Type For the years ended September 30 (in millions)
| 2021 |  | 2020 |  | 2019
Revenue from sales of electricity |  |  |  |  |
Local power companies | $ | 9,534 |  |  | $ | 9,406 |  |  | $ | 10,351 |
Industries directly served | 707 |  |  | 588 |  |  | 686 |
Federal agencies and other | 116 |  |  | 110 |  |  | 122 |
Revenue from sales of electricity | 10,357 |  |  | 10,104 |  |  | 11,159 |
Other revenue | 146 |  |  | 145 |  |  | 159 |
Total operating revenues | $ | 10,503 |  |  | $ | 10,249 |  |  | $ | 11,318 |
TVA and LPCs continue to work together to meet the changing needs of consumers around the Tennessee Valley. In 2019, the TVA Board approved a Partnership Agreement option that better aligns the length of LPC power contracts with TVA's long-term commitments. Under the partnership arrangement, the LPC power contracts automatically renew each year and have a 20-year termination notice. The partnership arrangements can be terminated under certain circumstances, including TVA's failure to limit rate increases as provided for in the agreements going forward. Participating LPCs receive benefits including a 3.1 percent wholesale bill credit in exchange for their long-term commitment, which enables TVA to recover its long-term financial commitments over a commensurate period. The total wholesale bill credits to LPCs participating in the long-term Partnership Agreement were $189 million, $163 million, and $14 million, respectively, for the years ended September 30, 2021, 2020, and 2019. In June 2020, TVA provided participating LPCs a flexibility option that allows them to locally generate or purchase up to approximately five percent of average total hourly energy sales over 2015 - 2019 in order to meet their individual customers' needs. As of November 12, 2021, 145 LPCs had signed the 20-year Partnership Agreement with TVA, and 74 LPCs had signed a Flexibility Agreement. In August 2020, the TVA Board approved a Pandemic Relief Credit that was effective for 2021. The 2.5 percent monthly base rate credit, which totaled $221 million for 2021, applied to service provided to TVA's LPCs, their large commercial and industrial customers, and TVA directly served customers through September 2021. In August 2021, the TVA Board approved a 2.5 percent monthly base rate credit, the Pandemic Recovery Credit, which will be effective for 2022. The credit, expected to approximate $220 million, will also apply to service provided to TVA's LPCs, their large commercial and industrial customers, and TVA directly served customers. In November 2021, the TVA Board approved a 1.5 percent monthly base rate credit, which is an extension of the Pandemic Recovery Credit, to be effective for 2023. The 2023 credit is expected to approximate $133 million, and it will be administered in a manner similar to the Pandemic Recovery Credit. The number of LPCs by contract arrangement, the revenues derived from such arrangements for 2021, and the percentage those revenues comprised of TVA's total operating revenues for 2021, are summarized in the table below:
TVA Local Power Company Contracts At or for the year ended September 30, 2021
Contract Arrangements(1) | Number of LPCs |  | Revenue from Sales of Electricity to LPCs (in millions) |  | Percentage of Total Operating Revenues
20-year termination notice | 145 |  |  | $ | 7,987 |  |  | 76.0 | %
5-year termination notice | 8 |  |  | 1,547 |  |  | 14.7 | %
Total | 153 |  |  | $ | 9,534 |  |  | 90.7 | %
Note (1) Ordinarily, the LPCs and TVA have the same termination notice period; however, in a contract with one of the LPCs with a five-year termination notice, TVA has a 10-year termination notice (which becomes a five-year termination notice if TVA loses its discretionary wholesale rate-setting authority). Certain LPCs have five-year termination notices or a shorter period if any act of Congress, court decision, or regulatory change requires or permits that election. TVA's two largest LPCs — MLGW and Nashville Electric Service ("NES") — have contracts with a five-year and a 20-year termination notice period, respectively. Sales to MLGW and NES accounted for nine percent and eight percent, respectively, of TVA's total operating revenues in 2021, 2020, and 2019. Certain LPCs, including MLGW, are evaluating options for future energy choices. In addition, in January 2021, four LPCs filed a complaint and petition with the Federal Energy Regulatory Commission ("FERC") asking FERC to order TVA to provide transmission and interconnection service to the LPCs or other suppliers that want to serve them. In August 2021, one of the LPCs notified FERC of its withdrawal from the complaint and petition. The remaining three LPCs account for three percent of TVA's total operating revenues for the year ended September 30, 2021. See Note 23 — Commitments and Contingencies — Legal Proceedings — Challenge to Anti-Cherrypicking Amendment for updates to this legal proceeding.
Contract with Customer, Asset and Liability [Table Text Block] | Contract Balances Contract assets represent an entity's right to consideration in exchange for goods and services that the entity has transferred to customers. TVA does not have any material contract assets at September 30, 2021. Contract liabilities represent an entity's obligations to transfer goods or services to customers for which the entity has received consideration (or an amount of consideration is due) from the customers. These contract liabilities are primarily related to upfront consideration received prior to the satisfaction of the performance obligation. See Economic Development Incentives below.

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