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Revenue Customer Type (Details) $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($) Units	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Electric revenue	$ 11,899	$ 12,371	$ 10,357
Other revenue	155	169	146
Revenues	12,054	12,540	10,503
Bill credits for LTA	$ (199)	(199)	189
Number of LPCs signed LTA | Units	147
Percentage of total operating revenues	90.40%
Total number of LPCs | Units	153
Off-system sales	$ 14	19	7
Revenue capitalized during pre-commercial operations	$ (3)	0	0
Percent of sales of electricity to LPCs	92.00%
Pandemic Relief Credit	$ (225)	$ (228)	$ 221
Number of LPCs signed flexibility agreement | Units	89
MLGW's % of operating revenues	9.00%	9.00%	9.00%
NES's % of operating revenues	8.00%	8.00%	8.00%
20-year contract arrangement [Member]
Percentage of total operating revenues	77.70%
5-year contract arrangement [Member]
Number of LPCs signed LTA | Units	6
Percentage of total operating revenues	12.70%
TENNESSEE
Electric revenue	$ 7,819	$ 8,137	$ 6,841
VIRGINIA
Electric revenue	46	48	42
NORTH CAROLINA
Electric revenue	89	87	66
MISSISSIPPI
Electric revenue	1,146	1,182	984
KENTUCKY
Electric revenue	773	821	655
GEORGIA
Electric revenue	284	299	254
ALABAMA
Electric revenue	1,731	1,778	1,508
Federal agencies and other [Member]
Electric revenue	135	154	116
20-year contract arrangement [Member]
Electric revenue	9,367
5-year contract arrangement [Member]
Electric revenue	1,536
Local Power Company [Member]
Electric revenue	10,903	11,291	9,534
Industries Directly Served [Member]
Electric revenue	$ 864	$ 926	$ 707

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