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Proprietary Capital Proprietary Capital (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Amount of appropriation investment that must be repaid | $ 1,000,000,000 |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Remaining appropriation investment | 258,000,000 |  |  |  |  |  |  |  | 258,000,000 |  |
Balance at beginning of year |  |  |  | 5,647,000,000 |  |  |  | 5,326,000,000 | 5,647,000,000 | 5,326,000,000 | 5,229,000,000
Net income (loss) | 322,000,000 | (81,000,000) | 295,000,000 | (67,000,000) | 474,000,000 | (12,000,000) | 54,000,000 | (245,000,000) | 469,000,000 | 271,000,000 | 60,000,000
Return of power program appropriation investment |  |  |  |  |  |  |  |  | 10,000,000 | 20,000,000 | 20,000,000
Return on power program appropriation investment |  |  |  |  |  |  |  |  | 4,000,000 | 7,000,000 | 7,000,000
Balance at end of year | 6,104,000,000 |  |  |  | 5,647,000,000 |  |  |  | 6,104,000,000 | 5,647,000,000 | 5,326,000,000
Net proprietary capital at September 30 | 6,104,000,000 |  |  |  | 5,647,000,000 |  |  |  | 6,104,000,000 | 5,647,000,000 |
Computed average interest rate payable | 1.97% |  |  |  | 2.10% |  |  |  | 1.97% | 2.10% | 2.33%
Nonpower Programs Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 4,351,000,000 |  |  |  | 4,351,000,000 | 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 |  |  |  | 4,351,000,000 | 4,351,000,000 |
Power Program Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 268,000,000 |  |  |  | 288,000,000 | 268,000,000 | 288,000,000 | 308,000,000
Net income (loss) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Return of power program appropriation investment |  |  |  |  |  |  |  |  | 10,000,000 | 20,000,000 | 20,000,000
Return on power program appropriation investment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Balance at end of year | 258,000,000 |  |  |  | 268,000,000 |  |  |  | 258,000,000 | 268,000,000 | 288,000,000
Power Program Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 4,767,000,000 |  |  |  | 4,492,000,000 | 4,767,000,000 | 4,492,000,000 | 4,429,000,000
Net income (loss) |  |  |  |  |  |  |  |  | 477,000,000 | 282,000,000 | 70,000,000
Return of power program appropriation investment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  |  |  |  |  | 4,000,000 | 7,000,000 | 7,000,000
Balance at end of year | 5,240,000,000 |  |  |  | 4,767,000,000 |  |  |  | 5,240,000,000 | 4,767,000,000 | 4,492,000,000
Net proprietary capital at September 30 | 5,498,000,000 |  |  |  | 5,035,000,000 |  |  |  | 5,498,000,000 | 5,035,000,000 |
Nonpower Programs Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | (3,742,000,000) |  |  |  | (3,731,000,000) | (3,742,000,000) | (3,731,000,000) |
Net income (loss) |  |  |  |  |  |  |  |  | (8,000,000) | (11,000,000) |
Return on power program appropriation investment |  |  |  |  |  |  |  |  | 0 | 0 |
Balance at end of year | (3,750,000,000) |  |  |  | (3,742,000,000) |  |  |  | (3,750,000,000) | (3,742,000,000) |
Net proprietary capital at September 30 | 601,000,000 |  |  |  | 609,000,000 |  |  |  | 601,000,000 | 609,000,000 |
Power Program Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Appropriation Investment |  |  |  |  |  |  |  |  |  |  |
Return of power program appropriation investment |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 20,000,000 |

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