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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Power Program Appropriation Investment | $ 258 |  | $ 258 |
Power Program Retained Earnings | 8,571 |  | 8,282 |
Nonpower Programs Appropriation Investment, Net | 570 |  | 572 |
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges | 57 |  | 21 |
Total Proprietary Capital | 9,456 | $ 8,551 | 9,133 | $ 8,420
Net income (loss) | 288 | 102 |  |
Total other comprehensive income (loss) | 36 | 30 |  |
Return on power program appropriation investment | (1) | (1) |  |
Power Program Appropriation Investment |  |  |  |
Power Program Appropriation Investment | 258 | 258 | 258 | 258
Net income (loss) | 0 | 0 |  |
Total other comprehensive income (loss) | 0 | 0 |  |
Return on power program appropriation investment | 0 | 0 |  |
Power Program Retained Earnings |  |  |  |
Power Program Retained Earnings | 8,571 | 7,697 | 8,282 | 7,594
Net income (loss) | 290 | 104 |  |
Total other comprehensive income (loss) | 0 | 0 |  |
Return on power program appropriation investment | (1) | (1) |  |
Nonpower Programs Appropriation Investment, Net |  |  |  |
Nonpower Programs Appropriation Investment, Net | 570 | 578 | 572 | 580
Net income (loss) | (2) | (2) |  |
Total other comprehensive income (loss) | 0 | 0 |  |
Return on power program appropriation investment | 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 | 57 | 18 | $ 21 | $ (12)
Net income (loss) | 0 | 0 |  |
Total other comprehensive income (loss) | 36 | 30 |  |
Return on power program appropriation investment | $ 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 Balance of appropriated funds advanced and property transferred to/from the reporting entity by the U.S. government as an investment in its power program. + References No definition available. + Details
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- Definition Total proprietary capital. + 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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- Definition This element represents disclosure of the cash payments from net power proceeds paid annually to the U.S. government as a return on the government's appropriation investment in the reporting entity. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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