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Proprietary Capital (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Appropriation Investment
Amount of appropriation investment that was repaid	$ 1,000								$ 1,000
Remaining appropriation investment	258								258
Balance at beginning of year				$ 11,625				$ 10,283	11,625	$ 10,283	$ 9,133
Net income (loss)	700	$ 205	$ 255	192	$ 588	$ 165	$ 241	423	1,352	1,417	1,119
Return on power program appropriation investment									(6)	(6)	(5)
Balance at end of year	12,932				11,625				12,932	11,625	$ 10,283
Net proprietary capital at September 30	$ 12,932				$ 11,625				$ 12,932	$ 11,625
Computed average interest rate payable	2.44%				2.37%				2.44%	2.37%	2.09%
Nonpower Programs Appropriation Investment
Appropriation Investment
Balance at beginning of year				4,351					$ 4,351
Balance at end of year	$ 4,351				$ 4,351				4,351	$ 4,351
Power Program Appropriation Investment
Appropriation Investment
Balance at beginning of year				258				258	258	258	$ 258
Net income (loss)									0	0	0
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				10,823				9,404	10,823	9,404	8,282
Net income (loss)									1,360	1,425	1,127
Return on power program appropriation investment									(6)	(6)	(5)
Balance at end of year	12,177				10,823				12,177	10,823	9,404
Net proprietary capital at September 30	12,435				11,081				12,435	11,081
Nonpower Programs Appropriation Investment, Net
Appropriation Investment
Balance at beginning of year				556				564	556	564	572
Net income (loss)									(8)	(8)	(8)
Return on power program appropriation investment									0	0	0
Balance at end of year	548				556				548	556	564
Nonpower Programs Retained Earnings
Appropriation Investment
Balance at beginning of year				$ (3,795)				$ (3,787)	(3,795)	(3,787)
Return on power program appropriation investment									0	0
Balance at end of year	(3,803)				(3,795)				(3,803)	(3,795)	(3,787)
Net proprietary capital at September 30	$ 548				$ 556				548	556
Affiliated Entity
Appropriation Investment
Return on power program appropriation investment									$ (6)	$ (6)	$ (5)

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

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Total proprietary capital.

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

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

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