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Revenue Customer Type (Details) $ in Millions	12 Months Ended
	Sep. 30, 2021 USD ($) Units	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Electric revenue	$ 10,357	$ 10,104	$ 11,159
Other revenue	146	145	159
Revenues	10,503	10,249	11,318
Bill credits for LTA	$ (189)	(163)	14
Number of LPCs signed LTA | Units	145
Percentage of total operating revenues	90.70%
Total number of LPCs | Units	153
Number of LPCs signed Flexibility Agreement | Units	74
Off-system sales	$ 7	4	4
Percent of sales of electricity to LPCs	92.00%
Pandemic Relief Credit	$ (221)
MLGW's % of operating revenues	9.00%
NES's % of operating revenues	8.00%
20-year contract arrangement [Member]
Percentage of total operating revenues	76.00%
5-year contract arrangement [Member]
Number of LPCs signed LTA | Units	8
Percentage of total operating revenues	14.70%
TENNESSEE
Electric revenue	$ 6,841	6,740	7,419
VIRGINIA
Electric revenue	42	42	45
NORTH CAROLINA
Electric revenue	66	65	74
MISSISSIPPI
Electric revenue	984	941	1,063
KENTUCKY
Electric revenue	655	624	691
GEORGIA
Electric revenue	254	249	270
ALABAMA
Electric revenue	1,508	1,439	1,593
Federal agencies and other [Member]
Electric revenue	116	110	122
20-year contract arrangement [Member]
Electric revenue	7,987
5-year contract arrangement [Member]
Electric revenue	1,547
Local Power Company [Member]
Electric revenue	9,534	9,406	10,351
Industries Directly Served [Member]
Electric revenue	$ 707	$ 588	$ 686

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