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Revenue Customer Type (Details) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2020 USD ($) Units	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Units	Jun. 30, 2019 USD ($)
Revenue, Major Customer [Line Items]
MLGW's % of operating revenues				900.00%	800.00%
NES's % of operating revenues				800.00%
Sales of Electricity	$ 2,216		$ 2,565	$ 7,237	$ 7,958
Electric revenue	2,215		2,563	7,234	7,955
Off System Sales of Electricity	1		2	3	3
Other revenue	35		39	113	121
Revenues	2,251		2,604	7,350	8,079
Bill credits for LTA	$ 38			$ 108
Number of LPCs signed LTA | Units	141			141
Percent of sales of electricity to LPCs				93.00%
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	$ 2,058	$ 2,366		$ 6,716	7,347
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	132	168		442	521
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	26	$ 31		79	90
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue	312		367	1,041	1,146
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue	52		59	179	196
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue	140		157	455	498
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue	204		250	668	751
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue	13		15	50	56
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue	1,485		1,705	4,809	5,273
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue	$ 9		$ 10	$ 32	$ 35

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MLGW's % of operating revenues

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NES's % of operating revenues

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Off System Sales of Electricity

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Sales of Electricity

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