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Revenue Customer Type (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) Units	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Units	Jun. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)
Revenue, Major Customer [Line Items]
MLGW's % of operating revenues			800.00%	900.00%
NES's % of operating revenues			800.00%	800.00%
Sales of Electricity	$ 2,491	$ 2,216	$ 7,294	$ 7,237
Electric revenue	2,490	2,215	7,289	7,234
Off System Sales of Electricity	1		5	3
Other revenue	36	35	109	113
Revenues	2,527	2,251	7,403	7,350
Bill credits for LTA	$ (43)	(38)	$ (133)	(108)
Number of LPCs signed LTA | Units	142		142
Number of LPCs signed Flexibility Agreement | Units	71		71
Percent of sales of electricity to LPCs			92.00%
Pandemic Relief Credit	$ (52)		$ (156)
Number of LPCs signed LTA by Filing Date | Units	143		143
Forecast
Revenue, Major Customer [Line Items]
Pandemic Relief Credit					$ 200
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	$ 2,283	2,058	$ 6,711	6,716
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	179	132	501	442
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	29	26	82	79
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue	359	312	1,072	1,041
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue	60	52	184	179
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue	163	140	457	455
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue	237	204	686	668
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue	15	13	49	50
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue	1,646	1,485	4,810	4,809
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue	$ 10	$ 9	$ 31	$ 32

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MLGW's % of operating revenues

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Off System Sales of Electricity

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