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Proprietary Capital (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Appropriation Investment
Amount of appropriation investment that was repaid	$ 1,000
Net income (loss)	1,135	$ 500	$ 1,108
Return on power program appropriation investment	(7)	(6)	(4)
Net proprietary capital at September 30	$ 17,161	$ 16,056	$ 15,505	$ 14,465
Computed average interest rate payable	3.02%	1.99%	1.47%
Power Program Appropriation Investment
Appropriation Investment
Net income (loss)	$ 0	$ 0	$ 0
Return on power program appropriation investment	0	0	0
Power Program Retained Earnings
Appropriation Investment
Net income (loss)	1,142	508	1,115
Return on power program appropriation investment	(7)	(6)	4
Nonpower Programs Appropriation Investment, Net
Appropriation Investment
Net income (loss)	(7)	(8)	(7)
Return on power program appropriation investment	0	0	0
Affiliated Entity
Appropriation Investment
Return on power program appropriation investment	$ (7)	$ (6)	$ (4)

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

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Appropriation Investment [Line Items]

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

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