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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Balance at beginning of year |  | $ 11,625 |  | $ 10,283 | $ 11,625 | $ 10,283 | $ 9,133
Net income (loss) | $ 700 | 192 | $ 588 | 423 | 1,352 | 1,417 | 1,119
Total other comprehensive income (loss) |  |  |  |  | (39) | (69) | 36
Return on power program appropriation investment |  |  |  |  | (6) | (6) | (5)
Balance at end of year | 12,932 |  | 11,625 |  | 12,932 | 11,625 | 10,283
Power Program Appropriation Investment |  |  |  |  |  |  |
Balance at beginning of year |  | 258 |  | 258 | 258 | 258 | 258
Net income (loss) |  |  |  |  | 0 | 0 | 0
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Balance at end of year | 258 |  | 258 |  | 258 | 258 | 258
Power Program Retained Earnings |  |  |  |  |  |  |
Balance at beginning of year |  | 10,823 |  | 9,404 | 10,823 | 9,404 | 8,282
Net income (loss) |  |  |  |  | 1,360 | 1,425 | 1,127
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | (6) | (6) | (5)
Balance at end of year | 12,177 |  | 10,823 |  | 12,177 | 10,823 | 9,404
Nonpower Programs Appropriation Investment, Net |  |  |  |  |  |  |
Balance at beginning of year |  | 556 |  | 564 | 556 | 564 | 572
Net income (loss) |  |  |  |  | (8) | (8) | (8)
Total other comprehensive income (loss) |  |  |  |  | 0 | 0 | 0
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Balance at end of year | 548 |  | 556 |  | 548 | 556 | 564
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |  |
Balance at beginning of year |  | $ (12) |  | $ 57 | (12) | 57 | 21
Net income (loss) |  |  |  |  | 0 | 0 | 0
Total other comprehensive income (loss) |  |  |  |  | (39) | (69) | 36
Return on power program appropriation investment |  |  |  |  | 0 | 0 | 0
Balance at end of year | $ (51) |  | $ (12) |  | $ (51) | $ (12) | $ 57

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