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Revenue (Tables) | 6 Months Ended
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Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |
State [Table Text Block] | TVA's operating revenues by state for the three and six months ended March 31, 2020 and 2019 are detailed in the table below:
Operating Revenues By State (in millions)
| Three Months Ended March 31 |  | Six Months Ended March 31
| 2020 |  | 2019 |  | 2020 |  | 2019
Alabama | $ | 360 |  |  | $ | 387 |  |  | $ | 729 |  |  | $ | 779 |
Georgia | 64 |  |  | 70 |  |  | 127 |  |  | 137 |
Kentucky | 158 |  |  | 173 |  |  | 315 |  |  | 341 |
Mississippi | 227 |  |  | 249 |  |  | 464 |  |  | 501 |
North Carolina | 19 |  |  | 21 |  |  | 37 |  |  | 41 |
Tennessee | 1,648 |  |  | 1,799 |  |  | 3,324 |  |  | 3,568 |
Virginia | 12 |  |  | 13 |  |  | 23 |  |  | 25 |
Subtotal | 2,488 |  |  | 2,712 |  |  | 5,019 |  |  | 5,392 |
Off-system sales | 1 |  |  | — |  |  | 2 |  |  | 1 |
Revenue from sales of electricity | 2,489 |  |  | 2,712 |  |  | 5,021 |  |  | 5,393 |
Other revenue | 32 |  |  | 38 |  |  | 78 |  |  | 82 |
Total operating revenues | $ | 2,521 |  |  | $ | 2,750 |  |  | $ | 5,099 |  |  | $ | 5,475 |

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