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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024		Mar. 31, 2023	Sep. 30, 2023
Debt Instrument
Total long-term debt, net	$ 18,781			$ 18,777
Repayments of Unsecured Debt	1	[1]	$ 1
Amount of letters of credit outstanding	$ 6
Percent of par value	100.00%
Long-term power bonds, net	$ 17,866			$ 17,844
Repayments of Other Long-term Debt	$ 17		$ 22
Debt Instrument, Redemption, Description	18
[1] (1) All redemptions were at 100 percent of par.

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