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Proprietary Capital Proprietary Capital (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Appropriation Investment
Amount of appropriation investment that must be repaid	$ 1,000								$ 1,000
Remaining appropriation investment	258								258
Balance at beginning of year				$ 6,104				$ 5,647	6,104	$ 5,647	$ 5,326
Net income (loss)	502	$ 32	$ 496	81	$ 322	$ (81)	$ 295	(67)	1,111	469	271
Return of power program appropriation investment										10	20
Return on power program appropriation investment									5	4	7
Balance at end of year	7,203				6,104				7,203	6,104	$ 5,647
Net proprietary capital at September 30	$ 7,203				$ 6,104				$ 7,203	$ 6,104
Computed average interest rate payable	2.04%				1.97%				2.04%	1.97%	2.10%
Nonpower Programs Appropriation Investment
Appropriation Investment
Balance at beginning of year				4,351				4,351	$ 4,351	$ 4,351
Return of power program appropriation investment									0	0
Balance at end of year	$ 4,351				$ 4,351				4,351	4,351	$ 4,351
Power Program Appropriation Investment
Appropriation Investment
Balance at beginning of year				258				268	258	268	288
Net income (loss)									0	0	0
Return of power program appropriation investment									0	10	20
Return on power program appropriation investment									0	0	0
Balance at end of year	258				258				258	258	268
Power Program Retained Earnings
Appropriation Investment
Balance at beginning of year				5,240				4,767	5,240	4,767	4,492
Net income (loss)									1,122	477	282
Return of power program appropriation investment										0	0
Return on power program appropriation investment									5	4	7
Balance at end of year	6,357				5,240				6,357	5,240	4,767
Net proprietary capital at September 30	6,615				5,498				6,615	5,498
Nonpower Programs Retained Earnings
Appropriation Investment
Balance at beginning of year				$ (3,750)				$ (3,742)	(3,750)	(3,742)
Net income (loss)									(11)	(8)
Return on power program appropriation investment									0	0
Balance at end of year	(3,761)				(3,750)				(3,761)	(3,750)	$ (3,742)
Net proprietary capital at September 30	$ 590				$ 601				$ 590	601
Power Program Appropriation Investment
Appropriation Investment
Return of power program appropriation investment										$ 10

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- Definition

The amount of the appropriation investment from Congress that must be repaid.

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Appropriation Investment [Line Items]

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Capital balance.

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The computed average interest rate payable by the U.S. Treasury on its total marketable public obligations.

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Total proprietary capital.

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- Definition

The remaining appropriation investment if no additional appropriations from Congress are received.

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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 of the government's appropriation investment in the reporting entity.

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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.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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