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Revenue (Tables) | 6 Months Ended
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Mar. 31, 2025
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | TVA's operating revenues by state for the three and six months ended March 31, 2025 and 2024, are detailed in the table below:
Operating Revenues By State (in millions)
| Three Months Ended March 31 |  | Six Months Ended March 31
| 2025 |  | 2024 |  | 2025 |  | 2024
Alabama | $ | 520 |  |  | $ | 457 |  |  | $ | 951 |  |  | $ | 865 |
Georgia | 94 |  |  | 80 |  |  | 168 |  |  | 149 |
Kentucky | 214 |  |  | 201 |  |  | 396 |  |  | 378 |
Mississippi | 307 |  |  | 284 |  |  | 576 |  |  | 539 |
North Carolina | 28 |  |  | 28 |  |  | 49 |  |  | 51 |
Tennessee | 2,298 |  |  | 2,027 |  |  | 4,184 |  |  | 3,816 |
Virginia | 16 |  |  | 14 |  |  | 28 |  |  | 25 |
Subtotal | 3,477 |  |  | 3,091 |  |  | 6,352 |  |  | 5,823 |
Off-system sales | 1 |  |  | 2 |  |  | 2 |  |  | 4 |
Revenue capitalized during pre-commercial plant operations(1) | (2) |  |  | — |  |  | (2) |  |  | (3) |
Revenue from sales of electricity | 3,476 |  |  | 3,093 |  |  | 6,352 |  |  | 5,824 |
Other revenue | 56 |  |  | 61 |  |  | 100 |  |  | 95 |
Total operating revenues | $ | 3,532 |  |  | $ | 3,154 |  |  | $ | 6,452 |  |  | $ | 5,919 |
Note (1) Represents revenue capitalized during pre-commercial operations at Johnsonville Aeroderivative CT Units 21-30 in the six months ended March 31, 2025 and Paradise CT Units 5-7 in the six months ended March 31, 2024, all of which was recognized in the three months ended December 31, 2023.
Revenue from External Customers by Products and Services [Table Text Block] | TVA's operating revenues by customer type for the three and six months ended March 31, 2025 and 2024, are detailed in the table below:
Operating Revenues by Customer Type (in millions)
| Three Months Ended March 31 |  | Six Months Ended March 31
| 2025 |  | 2024 |  | 2025 |  | 2024
Revenue from sales of electricity |  |  |  |  |  |  |
Local power companies | $ | 3,199 |  |  | $ | 2,842 |  |  | $ | 5,815 |  |  | $ | 5,329 |
Industries directly served | 245 |  |  | 221 |  |  | 475 |  |  | 438 |
Federal agencies and other | 34 |  |  | 30 |  |  | 64 |  |  | 60 |
Revenue capitalized during pre-commercial plant operations(1) | (2) |  |  | — |  |  | (2) |  |  | (3) |
Revenue from sales of electricity | 3,476 |  |  | 3,093 |  |  | 6,352 |  |  | 5,824 |
Other revenue | 56 |  |  | 61 |  |  | 100 |  |  | 95 |
Total operating revenues | $ | 3,532 |  |  | $ | 3,154 |  |  | $ | 6,452 |  |  | $ | 5,919 |
Note (1) Represents revenue capitalized during pre-commercial operations at Johnsonville Aeroderivative CT Units 21-30 in the six months ended March 31, 2025 and Paradise CT Units 5-7 in the six months ended March 31, 2024, all of which was recognized in the three months ended December 31, 2023.
Schedule of Long-term Contracts for Purchase of Electric Power |
TVA Local Power Company Contracts At or for the Six Months Ended March 31, 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 |  |  | $ | 5,071 |  |  | 78.6 | %
5-year termination notice |  | 5 |  |  | 744 |  |  | 11.5 | %
Total |  | 153 |  |  | $ | 5,815 |  |  | 90.1 | %
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 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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