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Revenue (Tables) | 3 Months Ended | 9 Months Ended
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Jun. 30, 2023 | Jun. 30, 2023
Revenue from Contract with Customer [Abstract] |  |
State [Table Text Block] |  | TVA's operating revenues by state for the three and nine months ended June 30, 2023 and 2022, are detailed in the table below:
Operating Revenues By State (in millions)
| Three Months Ended June 30 |  | Nine Months Ended June 30
| 2023 |  | 2022 |  | 2023 |  | 2022
Alabama | $ | 388 |  |  | $ | 419 |  |  | $ | 1,244 |  |  | $ | 1,203 |
Georgia | 59 |  |  | 69 |  |  | 207 |  |  | 207 |
Kentucky | 172 |  |  | 195 |  |  | 562 |  |  | 556 |
Mississippi | 263 |  |  | 283 |  |  | 814 |  |  | 788 |
North Carolina | 17 |  |  | 20 |  |  | 67 |  |  | 63 |
Tennessee | 1,754 |  |  | 1,929 |  |  | 5,613 |  |  | 5,455 |
Virginia | 9 |  |  | 10 |  |  | 35 |  |  | 34 |
Subtotal | 2,662 |  |  | 2,925 |  |  | 8,542 |  |  | 8,306 |
Off-system sales | 2 |  |  | 7 |  |  | 9 |  |  | 12 |
Revenue from sales of electricity | 2,664 |  |  | 2,932 |  |  | 8,551 |  |  | 8,318 |
Other revenue | 34 |  |  | 38 |  |  | 121 |  |  | 119 |
Total operating revenues | $ | 2,698 |  |  | $ | 2,970 |  |  | $ | 8,672 |  |  | $ | 8,437 |
Revenue from External Customers by Products and Services [Table Text Block] |  | TVA's operating revenues by customer type for the three and nine months ended June 30, 2023 and 2022, are detailed in the table below:
Operating Revenues by Customer Type (in millions)
| Three Months Ended June 30 |  | Nine Months Ended June 30
| 2023 |  | 2022 |  | 2023 |  | 2022
Revenue from sales of electricity |  |  |  |  |  |  |
Local power companies | $ | 2,431 |  |  | $ | 2,662 |  |  | $ | 7,811 |  |  | $ | 7,576 |
Industries directly served | 203 |  |  | 229 |  |  | 645 |  |  | 640 |
Federal agencies and other | 30 |  |  | 41 |  |  | 95 |  |  | 102 |
Revenue from sales of electricity | 2,664 |  |  | 2,932 |  |  | 8,551 |  |  | 8,318 |
Other revenue | 34 |  |  | 38 |  |  | 121 |  |  | 119 |
Total operating revenues | $ | 2,698 |  |  | $ | 2,970 |  |  | $ | 8,672 |  |  | $ | 8,437 |
Schedule of Long-term Contracts for Purchase of Electric Power | The number of LPCs by contract arrangement, the revenues derived from such arrangements for the three and nine months ended June 30, 2023, and the percentage those revenues comprised of TVA's total operating revenues for the same periods, are summarized in the tables below:
TVA Local Power Company Contracts At or for the Three Months Ended June 30, 2023
Contract Arrangements(1) |  | Number of LPCs |  | Revenue from Sales of Electricity to LPCs (in millions) |  | Percentage of Total Operating Revenues
20-year termination notice |  | 147 |  |  | $ | 2,073 |  |  | 76.8 | %
5-year termination notice |  | 6 |  |  | 358 |  |  | 13.3 | %
Total |  | 153 |  |  | $ | 2,431 |  |  | 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.
TVA Local Power Company Contracts At or for the Nine Months Ended June 30, 2023
Contract Arrangements(1) |  | Number of LPCs |  | Revenue from Sales of Electricity to LPCs (in millions) |  | Percentage of Total Operating Revenues
20-year termination notice |  | 147 |  |  | $ | 6,741 |  |  | 77.7 | %
5-year termination notice |  | 6 |  |  | 1,070 |  |  | 12.3 | %
Total |  | 153 |  |  | $ | 7,811 |  |  | 90.0 | %
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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