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Revenue Local Power Company Contracts (Tables) | 6 Months Ended
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Mar. 31, 2020
Long-term Contract for Purchase of Electric Power [Line Items] |
Long-term Contracts or Programs Disclosure [Text Block] | The number of LPCs with the contract arrangements described below, the revenues derived from such arrangements for the three and six months ended March 31, 2020, and the percentage of TVA's total operating revenues for the three and six months ended March 31, 2020 represented by these revenues, are summarized in the tables below:
TVA Local Power Company Contracts At and for the Three Months Ended March 31, 2020
Contract Arrangements(1) |  | Number of LPCs |  | Revenue from Sales of Electricity to LPCs (in millions) |  | Percentage of Total Operating Revenues
20-year termination notice |  | 138 |  |  | $ | 1,737 |  |  | 68.9 | %
10-year termination notice |  | 2 |  |  | 15 |  |  | 0.6 | %
5-year termination notice |  | 14 |  |  | 549 |  |  | 21.8 | %
Total |  | 154 |  |  | $ | 2,301 |  |  | 91.3 | %
Note (1) Ordinarily, the LPCs and TVA have the same termination notice period; however, in contracts with two of the LPCs with five-year termination notices, 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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