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Revenue Customer Type (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) Units	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) Units	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($)
Revenue, Major Customer [Line Items]
MLGW's % of operating revenues			800.00%
NES's % of operating revenues			800.00%
Sales of Electricity	$ 2,924	$ 2,848	$ 5,887	$ 5,386
Electric revenue	2,921	2,844	5,880	5,381
Off System Sales of Electricity	3		7	5
Other revenue	35	36	87	81
Revenues	2,959	2,884	5,974	5,467
Bill credits for LTA	$ (47)	(50)	$ (95)	(93)
Number of LPCs signed LTA | Units	147		147
Number of LPCs signed Flexibility Agreement | Units	83		83
Percent of sales of electricity to LPCs	91.00%
Pandemic Relief Credit	$ (53)	(55)	$ (106)	(105)
Forecast
Revenue, Major Customer [Line Items]
Pandemic Relief Credit					$ 230
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	2,674	2,608	5,380	4,914
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	217	206	442	411
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	33	34	65	61
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue	428	413	856	784
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue	72	74	148	138
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue	192	190	390	361
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue	273	264	551	505
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue	25	23	50	43
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue	1,918	1,867	3,859	3,526
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue	$ 13	$ 13	$ 26	$ 24

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Revenue from sales of electricity

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MLGW's % of operating revenues

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NES's % of operating revenues

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Off System Sales of Electricity

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Other revenue

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Percent of sales of electricity to LPCs

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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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