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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Mar. 31, 2023	Mar. 31, 2023		Mar. 31, 2022	Sep. 30, 2022
Debt Instrument
Total long-term debt, net		$ 19,816	$ 19,816			$ 18,794
Redemptions and repurchases of power bonds			1	[1]	$ 1
Total redemptions/maturities of debt	[1]		(23)
Proceeds from Issuance of Debt			992		0
Debt Instrument, Unamortized Discount		(8)	(8)
Amount of letters of credit outstanding		$ 6	$ 6
Percent of par value		99.187%	99.187%
Long-term power bonds, net		$ 18,865	$ 18,865			$ 17,826
Repayments of Other Long-term Debt			22		$ 21
2023 Series A
Debt Instrument
Long-term power bonds, net		$ 1,000	$ 1,000
Total
Debt Instrument
Percent of par value		100.00%	100.00%
2009 Series B [Member]
Debt Instrument
Redemptions and repurchases of power bonds		$ 1
Debt of variable interest entities [Member]
Debt Instrument
Repayments of Other Long-term Debt		$ 22
[1] (1) The 2023 Series A Bonds were issued at 99.187 percent of par. (2) All redemptions were at 100 percent of par.

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