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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Balance at beginning of year | $ 12,932 | $ 11,625 | $ 10,283
Net income (loss) | 1,512 | 1,352 | 1,417
Total other comprehensive income (loss) | 29 | (39) | (69)
Return on power program appropriation investment | (4) | (6) | (6)
New Accounting Standard - CECL | (4) |  |
Balance at end of year | 14,465 | 12,932 | 11,625
Power Program Appropriation Investment |  |  |
Balance at beginning of year | 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
New Accounting Standard - CECL | 0 |  |
Balance at end of year | 258 | 258 | 258
Power Program Retained Earnings |  |  |
Balance at beginning of year | 12,177 | 10,823 | 9,404
Net income (loss) | 1,520 | 1,360 | 1,425
Total other comprehensive income (loss) | 0 | 0 | 0
Return on power program appropriation investment | (4) | (6) | (6)
New Accounting Standard - CECL | (4) | 0 |
Balance at end of year | 13,689 | 12,177 | 10,823
Nonpower Programs Appropriation Investment, Net |  |  |
Balance at beginning of year | 548 | 556 | 564
Net income (loss) | (8) | (8) | (8)
Total other comprehensive income (loss) | 0 | 0 | 0
Return on power program appropriation investment | 0 | 0 | 0
New Accounting Standard - CECL | 0 | 0 |
Balance at end of year | 540 | 548 | 556
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges |  |  |
Balance at beginning of year | (51) | (12) | 57
Net income (loss) | 0 | 0 | 0
Total other comprehensive income (loss) | 29 | (39) | (69)
Return on power program appropriation investment | 0 | 0 | 0
New Accounting Standard - CECL | 0 |  |
Balance at end of year | $ (22) | $ (51) | $ (12)

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