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Proprietary Capital Proprietary Capital (Tables) | 12 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note [Abstract] |
Summary of Proprietary Capital Activity | The table below summarizes TVA's activities related to appropriated funds and retained earnings.
Summary of Proprietary Capital Activity At or for the years ended September 30
| 2018 |  | 2017
| Power Program |  | Nonpower Programs |  | Power Program |  | Nonpower Programs
Appropriation Investment | $ | 258 |  |  | $ | 4,351 |  |  | $ | 258 |  |  | $ | 4,351 |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | 8,282 |  |  | (3,779 | ) |  | 7,594 |  |  | (3,771 | )
Net income (expense) for year | 1,127 |  |  | (8 | ) |  | 693 |  |  | (8 | )
Return on power program appropriation investment | (5 | ) |  | — |  |  | (5 | ) |  | — |
Balance at end of year | 9,404 |  |  | (3,787 | ) |  | 8,282 |  |  | (3,779 | )
Net proprietary capital at September 30 | $ | 9,662 |  |  | $ | 564 |  |  | $ | 8,540 |  |  | $ | 572 |

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- Definition Tabular disclosure of changes in components of proprietary capital including net income, return of investment and return on investment by program + References No definition available. + Details
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