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Revenue Customer Type (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) Units	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) Units	Mar. 31, 2021 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Revenue, Major Customer [Line Items]
MLGW's % of operating revenues			800.00%
NES's % of operating revenues			800.00%
Sales of Electricity	$ 2,848	$ 2,533	$ 5,386	$ 4,803
Electric revenue	2,844	2,531	5,381	4,799
Off System Sales of Electricity	4		5	4
Other revenue	36	39	81	73
Revenues	2,884	2,572	5,467	4,876
Bill credits for LTA	$ (50)	(48)	$ (93)	(90)
Number of LPCs signed LTA | Units	146		146
Number of LPCs signed Flexibility Agreement | Units	77		77
Percent of sales of electricity to LPCs	92.00%		91.00%
Pandemic Relief Credit	$ (55)		$ (105)	(104)
Forecast
Revenue, Major Customer [Line Items]
Pandemic Relief Credit					$ 133	$ 220
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	2,608	2,337	4,914	4,428
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	206	168	411	322
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	34	28	61	53
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue	413	379	784	713
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue	74	66	138	124
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue	190	157	361	294
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue	264	237	505	449
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue	23	18	43	34
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue	1,867	1,663	3,526	3,164
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue	$ 13	$ 11	$ 24	$ 21

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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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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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