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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

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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