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Proprietary Capital Proprietary Capital (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Appropriation Investment
Amount of appropriation investment that was repaid	$ 1,000								$ 1,000
Remaining appropriation investment	258								258
Balance at beginning of year				$ 7,203				$ 6,104	7,203	$ 6,104	$ 5,647
Net income (loss)	661	$ 291	$ 318	(37)	$ 502	$ 32	$ 496	81	1,233	1,111	469
Return of power program appropriation investment											10
Return on power program appropriation investment									(6)	(5)	(4)
Balance at end of year	8,420				7,203				8,420	7,203	$ 6,104
Net proprietary capital at September 30	$ 8,420				$ 7,203				$ 8,420	$ 7,203
Computed average interest rate payable	2.04%				2.04%				2.04%	2.04%	1.97%
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				258	258	258	268
Net income (loss)									0	0	0
Return of power program appropriation investment									0	0	10
Return on power program appropriation investment									0	0	0
Balance at end of year	258				258				258	258	258
Power Program Retained Earnings
Appropriation Investment
Balance at beginning of year				6,357				5,240	6,357	5,240	4,767
Net income (loss)									1,243	1,122	477
Return of power program appropriation investment											0
Return on power program appropriation investment									(6)	(5)	(4)
Balance at end of year	7,594				6,357				7,594	6,357	5,240
Net proprietary capital at September 30	7,852				6,615				7,852	6,615
Nonpower Programs Retained Earnings
Appropriation Investment
Balance at beginning of year				$ (3,761)				$ (3,750)	(3,761)	(3,750)
Return on power program appropriation investment									0	0
Balance at end of year	(3,771)				(3,761)				(3,771)	(3,761)	(3,750)
Net proprietary capital at September 30	$ 580				$ 590				580	590
Power Program Appropriation Investment
Appropriation Investment
Return of power program appropriation investment											10
Affiliated Entity
Appropriation Investment
Return of power program appropriation investment									0	0	10
Return on power program appropriation investment									$ (6)	$ (5)	$ (4)

X

- 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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- Definition

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

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- Definition

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.

+ References

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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.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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-Name Accounting Standards Codification
-Topic 260
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-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
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-Section S99
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=51831270

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-Name Accounting Standards Codification
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