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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Power Program Appropriation Investment	$ 258		$ 258
Power Program Retained Earnings	7,697		7,594
Nonpower Programs Appropriation Investment, Net	578		580
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges	18		(12)
Total Proprietary Capital	8,551	$ 7,161	8,420	$ 7,203
Net income (loss)	102	(37)
Total other comprehensive income (loss)	30	(3)
Return on power program appropriation investment	(1)	(2)
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	7,697	6,321	7,594	6,357
Net income (loss)	104	(34)
Total other comprehensive income (loss)	0	0
Return on power program appropriation investment	(1)	(2)
Nonpower Programs Appropriation Investment, Net
Nonpower Programs Appropriation Investment, Net	578	587	580	590
Net income (loss)	(2)	(3)
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	18	(5)	$ (12)	$ (2)
Net income (loss)	0	0
Total other comprehensive income (loss)	30	(3)
Return on power program appropriation investment	$ 0	$ 0

X

- 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.

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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.

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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.

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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.

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