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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Balance at beginning of year |  | $ 5,647 |  | $ 5,326 | $ 5,647 | $ 5,326 | $ 5,229
Net income (loss) | 322 | (67) | 474 | (245) | 469 | 271 | 60
Total other comprehensive income (loss) |  |  |  |  | 2 | 77 | 64
Return on power program appropriation investment |  |  |  |  | (4) | (7) | (7)
Return of power program appropriation investment |  |  |  |  | (10) | (20) | (20)
Balance at end of year | 6,104 |  | 5,647 |  | 6,104 | 5,647 | 5,326
Power Program Appropriation Investment |  |  |  |  |  |  |
Balance at beginning of year |  | 268 |  | 288 | 268 | 288 | 308
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 |  |  |  |  | (10) | (20) | (20)
Balance at end of year | 258 |  | 268 |  | 258 | 268 | 288
Power Program Retained Earnings |  |  |  |  |  |  |
Balance at beginning of year |  | 4,767 |  | 4,492 | 4,767 | 4,492 | 4,429
Net income (loss) |  |  |  |  | 477 | 282 | 70
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | (4) | (7) | (7)
Return of power program appropriation investment |  |  |  |  | 0 | 0 | 0
Balance at end of year | 5,240 |  | 4,767 |  | 5,240 | 4,767 | 4,492
Nonpower Programs Appropriation Investment, Net |  |  |  |  |  |  |
Balance at beginning of year |  | 609 |  | 620 | 609 | 620 | 630
Net income (loss) |  |  |  |  | (8) | (11) | (10)
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 | 0
Balance at end of year | 601 |  | 609 |  | 601 | 609 | 620
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |  |
Balance at beginning of year |  | 3 |  | (74) | 3 | (74) | (138)
Net income (loss) |  |  |  |  | 0 | 0 | 0
Total other comprehensive income (loss) |  |  |  |  | 2 | 77 | 64
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Return of power program appropriation investment |  |  |  |  | 0 | 0 | 0
Balance at end of year | $ 5 |  | $ 3 |  | $ 5 | $ 3 | $ (74)

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