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Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Other revenue	$ 155	$ 169	$ 146
Off-system sales	14	19	7
Sales of Electricity (subtotal)	11,888	12,352	10,350
Electric revenue	(11,899)	(12,371)	(10,357)
Revenues	12,054	12,540	10,503
Pandemic Relief Credit	$ (225)	(228)	221
Revenue from Contract with Customer [Abstract]
Percent of Pandemic Credit Offered	2.50%
ALABAMA
Electric revenue	$ (1,731)	(1,778)	(1,508)
GEORGIA
Electric revenue	(284)	(299)	(254)
KENTUCKY
Electric revenue	(773)	(821)	(655)
MISSISSIPPI
Electric revenue	(1,146)	(1,182)	(984)
NORTH CAROLINA
Electric revenue	(89)	(87)	(66)
TENNESSEE
Electric revenue	(7,819)	(8,137)	(6,841)
VIRGINIA
Electric revenue	$ (46)	$ (48)	$ (42)

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Revenue from sales of electricity

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Sales of Electricity

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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