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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Balance at beginning of year | $ 15,505 | $ 14,465 | $ 12,932
Net income (loss) | 500 | 1,108 | 1,512
Total other comprehensive income (loss) | 57 | (64) | 29
Return on power program appropriation investment | (6) | (4) | (4)
Balance at end of year | 16,056 | 15,505 | 14,465
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 | 14,800 | 13,689 | 12,177
Net income (loss) | 508 | 1,115 | 1,520
Total other comprehensive income (loss) | 0 | 0 | 0
Return on power program appropriation investment | (6) | (4) | (4)
New Accounting Standard - CECL |  |  | (4)
Balance at end of year | 15,302 | 14,800 | 13,689
Nonpower Programs Appropriation Investment, Net |  |  |
Balance at beginning of year | 533 | 540 | 548
Net income (loss) | (8) | (7) | (8)
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 | 525 | 533 | 540
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges |  |  |
Balance at beginning of year | (86) | (22) | (51)
Net income (loss) | 0 | 0 | 0
Total other comprehensive income (loss) | 57 | (64) | 29
Return on power program appropriation investment | 0 | 0 | 0
New Accounting Standard - CECL |  |  | 0
Balance at end of year | $ (29) | $ (86) | $ (22)

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