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Proprietary Capital Proprietary Capital (Tables) | 12 Months Ended
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Sep. 30, 2015
Stockholders' Equity Note [Abstract] |
Summary of Proprietary Capital Activity | The table below summarizes TVA's activities related to appropriated funds.
Summary of Proprietary Capital Activity At or for the years ended September 30
| 2015 |  | 2014
Appropriation Investment | Power Program |  | Nonpower Programs |  | Power Program |  | Nonpower Programs
Balance at beginning of year | $ | 258 |  |  | $ | 4,351 |  |  | $ | 268 |  |  | $ | 4,351 |
Return of power program appropriation investment | — |  |  | — |  |  | (10 | ) |  | — |
Balance at end of year | 258 |  |  | 4,351 |  |  | 258 |  |  | 4,351 |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | 5,240 |  |  | (3,750 | ) |  | 4,767 |  |  | (3,742 | )
Net income (expense) for year | 1,122 |  |  | (11 | ) |  | 477 |  |  | (8 | )
Return on power program appropriation investment | (5 | ) |  | — |  |  | (4 | ) |  | — |
Balance at end of year | 6,357 |  |  | (3,761 | ) |  | 5,240 |  |  | (3,750 | )
Net proprietary capital at September 30 | $ | 6,615 |  |  | $ | 590 |  |  | $ | 5,498 |  |  | $ | 601 |

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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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