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Revenue Customer Type (Details) $ in Millions	12 Months Ended
	Sep. 30, 2024 USD ($) Units	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Electric revenue	$ 12,123	$ 11,888	$ 12,352
Bill credits for LTA	$ (215)	(199)	199
Percentage of total operating revenues	90.40%
Total number of LPCs | Units	153
Off-system sales	$ 8	14	19
Revenue capitalized during pre-commercial operations	$ (3)	(3)	0
Pandemic Relief Credit		$ (225)	228
Number of LPCs signed flexibility agreement | Units	102
Percent of sales of electricity to LPCs	92.00%	92.00%
Regulated Operating Revenue	$ 12,128	$ 11,899	12,371
Unregulated Operating Revenue	186	155	169
Regulated and Unregulated Operating Revenue	$ 12,314	$ 12,054	$ 12,540
MLGW's % of operating revenues	9.00%	9.00%	9.00%
NES's % of operating revenues	8.00%	8.00%	8.00%
ALABAMA
Regulated Operating Revenue	$ 1,768	$ 1,731	$ 1,778
GEORGIA
Regulated Operating Revenue	295	284	299
KENTUCKY
Regulated Operating Revenue	776	773	821
MISSISSIPPI
Regulated Operating Revenue	1,150	1,146	1,182
NORTH CAROLINA
Regulated Operating Revenue	89	89	87
TENNESSEE
Regulated Operating Revenue	7,998	7,819	8,137
VIRGINIA
Regulated Operating Revenue	$ 47	46	48
5-year contract arrangement [Member]
Number of LPCs signed LTA | Units	5
Percentage of total operating revenues	12.30%
Revenues	$ 1,517
20-year Termination Notice
Number of LPCs signed LTA | Units	148
Percentage of total operating revenues	78.10%
Revenues	$ 9,621
Federal agencies and other [Member]
Regulated Operating Revenue	125	135	154
Local Power Company [Member]
Electric revenue	11,138
Regulated Operating Revenue	11,138	10,903	11,291
Industries Directly Served [Member]
Regulated Operating Revenue	$ 868	$ 864	$ 926

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