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Proprietary Capital Proprietary Capital (Tables) | 12 Months Ended
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Sep. 30, 2013
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
| 2013 |  | 2012
Appropriation Investment | Power Program |  | Nonpower Programs |  | Power Program |  | Nonpower Programs
Balance at beginning of year | $ | 288 |  |  | $ | 4,351 |  |  | $ | 308 |  |  | $ | 4,351 |
Return of power program appropriation investment | (20 | ) |  | — |  |  | (20 | ) |  | — |
Balance at end of year | 268 |  |  | 4,351 |  |  | 288 |  |  | 4,351 |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | 4,492 |  |  | (3,731 | ) |  | 4,429 |  |  | (3,721 | )
Net income (expense) for year | 282 |  |  | (11 | ) |  | 70 |  |  | (10 | )
Return on power program appropriation investment | (7 | ) |  | — |  |  | (7 | ) |  | — |
Balance at end of year | 4,767 |  |  | (3,742 | ) |  | 4,492 |  |  | (3,731 | )
Net proprietary capital at September 30 | $ | 5,035 |  |  | $ | 609 |  |  | $ | 4,780 |  |  | $ | 620 |

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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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