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Proprietary Capital Proprietary Capital (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Appropriation Investment |  |  |
Amount of appropriation investment that must be repaid | $ 1,000,000,000 |  |
Unpaid appropriation investment | 10,000,000 |  |
Remaining appropriation investment | 258,000,000 |  |
Balance at beginning of year | 5,326,000,000 | 5,229,000,000 | 5,137,000,000
Net income (loss) | 271,000,000 | 60,000,000 | 162,000,000
Return of power program appropriation investment | 20,000,000 | 20,000,000 | 20,000,000
Return on power program appropriation investment | 7,000,000 | 7,000,000 | 7,000,000
Balance at end of year | 5,647,000,000 | 5,326,000,000 | 5,229,000,000
Net proprietary capital at September 30 | 5,647,000,000 | 5,326,000,000 |
Computed average interest rate payable | 2.10% | 2.33% | 2.40%
Nonpower Programs Appropriation Investment |  |  |
Appropriation Investment |  |  |
Balance at beginning of year | 4,351,000,000 | 4,351,000,000 |
Return of power program appropriation investment | 0 | 0 |
Balance at end of year | 4,351,000,000 | 4,351,000,000 |
Power Program Appropriation Investment |  |  |
Appropriation Investment |  |  |
Balance at beginning of year | 288,000,000 | 308,000,000 | 328,000,000
Net income (loss) | 0 | 0 | 0
Return of power program appropriation investment | 20,000,000 | 20,000,000 | 20,000,000
Return on power program appropriation investment | 0 | 0 | 0
Balance at end of year | 268,000,000 | 288,000,000 | 308,000,000
Power Program Retained Earnings |  |  |
Appropriation Investment |  |  |
Balance at beginning of year | 4,492,000,000 | 4,429,000,000 | 4,264,000,000
Net income (loss) | 282,000,000 | 70,000,000 | 172,000,000
Return of power program appropriation investment | 0 | 0 | 0
Return on power program appropriation investment | 7,000,000 | 7,000,000 | 7,000,000
Balance at end of year | 4,767,000,000 | 4,492,000,000 | 4,429,000,000
Net proprietary capital at September 30 | 5,035,000,000 | 4,780,000,000 |
Nonpower Programs Retained Earnings |  |  |
Appropriation Investment |  |  |
Balance at beginning of year | (3,731,000,000) | (3,721,000,000) |
Net income (loss) | (11,000,000) | (10,000,000) |
Return on power program appropriation investment | 0 | 0 |
Balance at end of year | (3,742,000,000) | (3,731,000,000) |
Net proprietary capital at September 30 | 609,000,000 | 620,000,000 |
Power Program Appropriation Investment |  |  |
Appropriation Investment |  |  |
Return of power program appropriation investment | $ 20,000,000 | $ 20,000,000 | $ 20,000,000

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- Definition The amount of the appropriation investment from Congress that must be repaid. + References No definition available. + Details
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- Details
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- Definition Capital balance. + References No definition available. + Details
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- Definition The computed average interest rate payable by the U.S. Treasury on its total marketable public obligations. + References No definition available. + Details
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- Definition Total proprietary capital. + References No definition available. + Details
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- Definition The remaining appropriation investment if no additional appropriations from Congress are received. + References No definition available. + Details
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- Definition This element represents disclosure of the cash payments from net power proceeds paid annually to the U.S. government as a return of the government's appropriation investment in the reporting entity. + References No definition available. + Details
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- Definition This element represents disclosure of the cash payments from net power proceeds paid annually to the U.S. government as a return on the government's appropriation investment in the reporting entity. + References No definition available. + Details
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- Definition The remaining unpaid appropriation investment. + References No definition available. + Details
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