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Revenue Customer Type (Details) $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) Units	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Electric revenue		$ 12,371	$ 10,357	$ 10,104
Other revenue		169	146	145
Revenues		12,540	10,503	10,249
Bill credits for LTA		$ (199)	(189)	163
Number of LPCs signed LTA | Units		147
Percentage of total operating revenues		90.00%
Total number of LPCs | Units		153
Off-system sales		$ 19	7	4
Percent of sales of electricity to LPCs		91.00%
Pandemic Relief Credit		$ (228)	(221)
MLGW's % of operating revenues		9.00%
NES's % of operating revenues		8.00%
Scenario, Forecast
Pandemic Relief Credit	$ 230
20-year contract arrangement [Member]
Percentage of total operating revenues		77.10%
5-year contract arrangement [Member]
Number of LPCs signed LTA | Units		6
Percentage of total operating revenues		12.90%
TENNESSEE
Electric revenue		$ 8,137	6,841	6,740
VIRGINIA
Electric revenue		48	42	42
NORTH CAROLINA
Electric revenue		87	66	65
MISSISSIPPI
Electric revenue		1,182	984	941
KENTUCKY
Electric revenue		821	655	624
GEORGIA
Electric revenue		299	254	249
ALABAMA
Electric revenue		1,778	1,508	1,439
Federal agencies and other [Member]
Electric revenue		154	116	110
20-year contract arrangement [Member]
Electric revenue		9,670
5-year contract arrangement [Member]
Electric revenue		1,621
Local Power Company [Member]
Electric revenue		11,291	9,534	9,406
Industries Directly Served [Member]
Electric revenue		$ 926	$ 707	$ 588

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