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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Power Program Appropriation Investment | $ 258,000,000 |  | $ 258,000,000 |  |  | $ 258,000,000 |  |
Power Program Retained Earnings | 12,815,000,000 |  | 12,815,000,000 |  |  | 12,177,000,000 |  |
Nonpower Programs Appropriation Investment, Net | 544,000,000 |  | 544,000,000 |  |  | 548,000,000 |  |
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges | 22,000,000 |  | 22,000,000 |  |  | (51,000,000) |  |
Total Proprietary Capital | 13,639,000,000 | $ 11,979,000,000 | 13,639,000,000 | $ 11,979,000,000 | $ 13,167,000,000 | 12,932,000,000 | $ 11,832,000,000 | $ 11,625,000,000
Net income (loss) | 456,000,000 | 255,000,000 | 640,000,000 | 447,000,000 |  |  |  |
Total other comprehensive income (loss) | 17,000,000 | (107,000,000) | 73,000,000 | (90,000,000) |  |  |  |
Return on power program appropriation investment | (1,000,000) | (1,000,000) | (2,000,000) | (3,000,000) |  |  |  |
New Accounting Standard - CECL | (4,000,000) |  |  |  |  |  |  |
Power Program Appropriation Investment |  |  |  |  |  |  |  |
Power Program Appropriation Investment | 258,000,000 | 258,000,000 | 258,000,000 | 258,000,000 | 258,000,000 | 258,000,000 | 258,000,000 | 258,000,000
Net income (loss) | 0 | 0 | 0 | 0 |  |  |  |
Total other comprehensive income (loss) | 0 | 0 | 0 | 0 |  |  |  |
Return on power program appropriation investment | 0 | 0 | 0 | 0 |  |  |  |
New Accounting Standard - CECL | 0 |  |  |  |  |  |  |
Power Program Retained Earnings |  |  |  |  |  |  |  |
Power Program Retained Earnings | 12,815,000,000 | 11,271,000,000 | 12,815,000,000 | 11,271,000,000 | 12,358,000,000 | 12,177,000,000 | 11,015,000,000 | 10,823,000,000
Net income (loss) | 458,000,000 | 257,000,000 | 644,000,000 | 451,000,000 |  |  |  |
Total other comprehensive income (loss) | 0 | 0 | 0 | 0 |  |  |  |
Return on power program appropriation investment | (1,000,000) | (1,000,000) | (2,000,000) | (3,000,000) |  |  |  |
New Accounting Standard - CECL | (4,000,000) |  |  |  |  |  |  |
Nonpower Programs Appropriation Investment, Net |  |  |  |  |  |  |  |
Nonpower Programs Appropriation Investment, Net | 544,000,000 | 552,000,000 | 544,000,000 | 552,000,000 | 546,000,000 | 548,000,000 | 554,000,000 | 556,000,000
Net income (loss) | (2,000,000) | (2,000,000) | (4,000,000) | (4,000,000) |  |  |  |
Total other comprehensive income (loss) | 0 | 0 | 0 | 0 |  |  |  |
Return on power program appropriation investment | 0 | 0 | 0 | 0 |  |  |  |
New Accounting Standard - CECL | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges | 22,000,000 | (102,000,000) | 22,000,000 | (102,000,000) | $ 5,000,000 | $ (51,000,000) | $ 5,000,000 | $ (12,000,000)
Net income (loss) | 0 | 0 | 0 | 0 |  |  |  |
Total other comprehensive income (loss) | 17,000,000 | (107,000,000) | 73,000,000 | (90,000,000) |  |  |  |
Return on power program appropriation investment | 0 | $ 0 | $ 0 | $ 0 |  |  |  |
New Accounting Standard - CECL | $ 0 |  |  |  |  |  |  |

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