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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
Power Program Appropriation Investment | $ 258 |  | $ 258 |  |  | $ 258 |  |
Power Program Retained Earnings | 9,033 |  | 9,033 |  |  | 8,282 |  |
Nonpower Programs Appropriation Investment, Net | 568 |  | 568 |  |  | 572 |  |
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges | 73 |  | 73 |  |  | 21 |  |
Total Proprietary Capital | 9,932 | $ 8,773 | 9,932 | $ 8,773 | $ 9,456 | 9,133 | $ 8,551 | $ 8,420
Net income (loss) | 462 | 211 | 750 | 313 |  |  |  |
Total other comprehensive income (loss) | 16 | 13 | 52 | 43 |  |  |  |
Return on power program appropriation investment | (2) | (2) | (3) | (3) |  |  |  |
Power Program Appropriation Investment |  |  |  |  |  |  |  |
Power Program Appropriation Investment | 258 | 258 | 258 | 258 | 258 | 258 | 258 | 258
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 |  |  |  |
Power Program Retained Earnings |  |  |  |  |  |  |  |
Power Program Retained Earnings | 9,033 | 7,908 | 9,033 | 7,908 | 8,571 | 8,282 | 7,697 | 7,594
Net income (loss) | 464 | 213 | 754 | 317 |  |  |  |
Total other comprehensive income (loss) | 0 | 0 | 0 | 0 |  |  |  |
Return on power program appropriation investment | (2) | (2) | (3) | (3) |  |  |  |
Nonpower Programs Appropriation Investment, Net |  |  |  |  |  |  |  |
Nonpower Programs Appropriation Investment, Net | 568 | 576 | 568 | 576 | 570 | 572 | 578 | 580
Net income (loss) | (2) | (2) | (4) | (4) |  |  |  |
Total other comprehensive income (loss) | 0 | 0 | 0 | 0 |  |  |  |
Return on power program appropriation investment | 0 | 0 | 0 | 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 | 73 | 31 | 73 | 31 | $ 57 | $ 21 | $ 18 | $ (12)
Net income (loss) | 0 | 0 | 0 | 0 |  |  |  |
Total other comprehensive income (loss) |  | 13 |  | 43 |  |  |  |
Return on power program appropriation investment | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |

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- Definition Appropriated funds advanced and property transferred to/from the reporting entity by the U.S. government for programs (exclusive of the power program) and program income received offset by expenses incurred in the administration of these programs. + References No definition available. + Details
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit from power program activities less amounts returned to the U.S. government as a return on its appropriation investment in the power program. + References No definition available. + Details
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