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Revenue Customer Type (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) Units	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Units	Jun. 30, 2022 USD ($)	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	$ 2,664	$ 2,932	$ 8,551	$ 8,318
Electric revenue	2,662	2,925	8,542	8,306
Off System Sales of Electricity	2		9	12
Other revenue	34	38	121	119
Revenues	2,698	2,970	8,672	8,437
Bill credits for LTA	$ (45)	(48)	$ (140)	(141)
Number of LPCs signed LTA | Units	147		147
Number of LPCs signed Flexibility Agreement | Units	86		86
Percent of sales of electricity to LPCs	91.00%
Pandemic Relief Credit	$ (52)	(56)	$ (158)	(161)
Forecast
Revenue, Major Customer [Line Items]
Pandemic Relief Credit					$ 230
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	2,431	2,662	7,811	7,576
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	203	229	645	640
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	30	41	95	102
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue	388	419	1,244	1,203
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue	59	69	207	207
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue	172	195	562	556
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue	263	283	814	788
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue	17	20	67	63
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue	1,754	1,929	5,613	5,455
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue	$ 9	$ 10	$ 35	$ 34

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MLGW's % of operating revenues

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Off System Sales of Electricity

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Sales of Electricity

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