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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Balance at beginning of year |  | $ 6,104 |  | $ 5,647 | $ 6,104 | $ 5,647 | $ 5,326
Net income (loss) | $ 502 | 81 | $ 322 | (67) | 1,111 | 469 | 271
Total other comprehensive income (loss) |  |  |  |  | (7) | 2 | 77
Return on power program appropriation investment |  |  |  |  | (5) | (4) | (7)
Return of power program appropriation investment |  |  |  |  |  | (10) | (20)
Balance at end of year | 7,203 |  | 6,104 |  | 7,203 | 6,104 | 5,647
Power Program Appropriation Investment |  |  |  |  |  |  |
Balance at beginning of year |  | 258 |  | 268 | 258 | 268 | 288
Net income (loss) |  |  |  |  | 0 | 0 | 0
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Return of power program appropriation investment |  |  |  |  | 0 | (10) | (20)
Balance at end of year | 258 |  | 258 |  | 258 | 258 | 268
Power Program Retained Earnings |  |  |  |  |  |  |
Balance at beginning of year |  | 5,240 |  | 4,767 | 5,240 | 4,767 | 4,492
Net income (loss) |  |  |  |  | 1,122 | 477 | 282
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | (5) | (4) | (7)
Return of power program appropriation investment |  |  |  |  |  | 0 | 0
Balance at end of year | 6,357 |  | 5,240 |  | 6,357 | 5,240 | 4,767
Nonpower Programs Appropriation Investment, Net |  |  |  |  |  |  |
Balance at beginning of year |  | 601 |  | 609 | 601 | 609 | 620
Net income (loss) |  |  |  |  | (11) | (8) | (11)
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Return of power program appropriation investment |  |  |  |  |  | 0 | 0
Balance at end of year | 590 |  | 601 |  | 590 | 601 | 609
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |  |
Balance at beginning of year |  | $ 5 |  | $ 3 | 5 | 3 | (74)
Net income (loss) |  |  |  |  | 0 | 0 | 0
Total other comprehensive income (loss) |  |  |  |  | (7) | 2 | 77
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Return of power program appropriation investment |  |  |  |  |  | 0 | 0
Balance at end of year | $ (2) |  | $ 5 |  | $ (2) | $ 5 | $ 3

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