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Revenue (Tables) | 12 Months Ended
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Sep. 30, 2025
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, net.
Disaggregation of Revenue [Table Text Block] | 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)
| 2025 |  | 2024 |  | 2023
Alabama | $ | 1,995 |  |  | $ | 1,768 |  |  | $ | 1,731 |
Georgia | 329 |  |  | 295 |  |  | 284 |
Kentucky | 850 |  |  | 776 |  |  | 773 |
Mississippi | 1,254 |  |  | 1,150 |  |  | 1,146 |
North Carolina | 88 |  |  | 89 |  |  | 89 |
Tennessee | 8,915 |  |  | 7,998 |  |  | 7,819 |
Virginia | 52 |  |  | 47 |  |  | 46 |
Subtotal | 13,483 |  |  | 12,123 |  |  | 11,888 |
Off-system sales | 7 |  |  | 8 |  |  | 14 |
Revenue capitalized during pre-commercial plant operations(1) | (4) |  |  | (3) |  |  | (3) |
Revenue from sales of electricity | 13,486 |  |  | 12,128 |  |  | 11,899 |
Other revenue | 186 |  |  | 186 |  |  | 155 |
Total operating revenues | $ | 13,672 |  |  | $ | 12,314 |  |  | $ | 12,054 |
Note (1) Represents revenue capitalized during pre-commercial operations at Johnsonville Aeroderivative CT Units 21-30 in 2025 and Paradise CT Units 5-7 in 2024.
Revenue from External Customers by Products and Services | 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)
| 2025 |  | 2024 |  | 2023
Revenue from sales of electricity |  |  |  |  |
Local power companies | $ | 12,334 |  |  | $ | 11,138 |  |  | $ | 10,903 |
Industries directly served | 1,017 |  |  | 868 |  |  | 864 |
Federal agencies and other | 139 |  |  | 125 |  |  | 135 |
Revenue capitalized during pre-commercial plant operations(1) | (4) |  |  | (3) |  |  | (3) |
Revenue from sales of electricity | 13,486 |  |  | 12,128 |  |  | 11,899 |
Other revenue | 186 |  |  | 186 |  |  | 155 |
Total operating revenues | $ | 13,672 |  |  | $ | 12,314 |  |  | $ | 12,054 |
Note (1) Represents revenue capitalized during pre-commercial operations at Johnsonville Aeroderivative CT Units 21-30 in 2025 and Paradise CT Units 5-7 in 2024.
Schedule of Long-Term Contracts for Purchase of Electric Power | The number of LPCs by contract arrangement, the revenues derived from such arrangements for 2025, and the percentage those revenues comprised of TVA's total operating revenues for 2025, are summarized in the table below:
TVA Local Power Company Contracts At or for the year ended September 30, 2025
Contract Arrangements(1) | Number of LPCs |  | Revenue from Sales of Electricity to LPCs (in millions) |  | Percentage of Total Operating Revenues
20-year termination notice | 148 |  |  | $ | 10,636 |  |  | 77.8 | %
5-year termination notice | 5 |  |  | 1,698 |  |  | 12.4 | %
Total | 153 |  |  | $ | 12,334 |  |  | 90.2 | %
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.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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- Definition Disclosure of accounting policy for revenue. Includes revenue from contract with customer and from other sources. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 + Details
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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 + Details
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- Definition Tabular disclosure of information concerning the terms and significance of long term contracts to purchase power (generally referred to as purchase power agreements (PPAs) or power sale agreements (PSAs)) including date of contract expiration, share of plant output being purchased, estimated annual cost, annual minimum debt service payment required and amount of related long-term debt or lease obligations outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.D) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480114/980-10-S99-1 + Details
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