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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Balance at beginning of year |  | $ 7,203 |  | $ 6,104 | $ 7,203 | $ 6,104 | $ 5,647
Net income (loss) | $ 661 | (37) | $ 502 | 81 | 1,233 | 1,111 | 469
Total other comprehensive income (loss) |  |  |  |  | (10) | (7) | 2
Return on power program appropriation investment |  |  |  |  | (6) | (5) | (4)
Return of power program appropriation investment |  |  |  |  |  |  | (10)
Balance at end of year | 8,420 |  | 7,203 |  | 8,420 | 7,203 | 6,104
Power Program Appropriation Investment |  |  |  |  |  |  |
Balance at beginning of year |  | 258 |  | 258 | 258 | 258 | 268
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 | 0 | (10)
Balance at end of year | 258 |  | 258 |  | 258 | 258 | 258
Power Program Retained Earnings |  |  |  |  |  |  |
Balance at beginning of year |  | 6,357 |  | 5,240 | 6,357 | 5,240 | 4,767
Net income (loss) |  |  |  |  | 1,243 | 1,122 | 477
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | (6) | (5) | (4)
Return of power program appropriation investment |  |  |  |  |  |  | 0
Balance at end of year | 7,594 |  | 6,357 |  | 7,594 | 6,357 | 5,240
Nonpower Programs Appropriation Investment, Net |  |  |  |  |  |  |
Balance at beginning of year |  | 590 |  | 601 | 590 | 601 | 609
Net income (loss) |  |  |  |  | (10) | (11) | (8)
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Return of power program appropriation investment |  |  |  |  |  |  | 0
Balance at end of year | 580 |  | 590 |  | 580 | 590 | 601
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |  |
Balance at beginning of year |  | $ (2) |  | $ 5 | (2) | 5 | 3
Net income (loss) |  |  |  |  | 0 | 0 | 0
Total other comprehensive income (loss) |  |  |  |  | (10) | (7) | 2
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Return of power program appropriation investment |  |  |  |  |  |  | 0
Balance at end of year | $ (12) |  | $ (2) |  | $ (12) | $ (2) | $ 5

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