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Revenue Customer Type (Details) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($) Units	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) Units	Jun. 30, 2021 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		$ 2,932	$ 2,491	$ 8,318	$ 7,294
Electric revenue		2,925	2,490	8,306	7,289
Off System Sales of Electricity		7		12	5
Other revenue		38	36	119	109
Revenues		2,970	2,527	8,437	7,403
Bill credits for LTA		$ (48)	(43)	$ (141)	(133)
Number of LPCs signed LTA | Units		146		146
Number of LPCs signed Flexibility Agreement | Units		79		79
Percent of sales of electricity to LPCs		91.00%
Pandemic Relief Credit		$ (56)	(52)	$ (161)	(156)
Forecast
Revenue, Major Customer [Line Items]
Revenues						$ 12,400
Pandemic Relief Credit	$ 220					$ 230
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue		2,662	2,283	7,576	6,711
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue		229	179	640	501
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue		41	29	102	82
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue		419	359	1,203	1,072
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue		69	60	207	184
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue		195	163	556	457
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue		283	237	788	686
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue		20	15	63	49
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue		1,929	1,646	5,455	4,810
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue		$ 10	$ 10	$ 34	$ 31

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MLGW's % of operating revenues

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Off System Sales of Electricity

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