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Revenue Customer Type (Details) $ in Millions	3 Months Ended
	Dec. 31, 2020 USD ($) Units	Dec. 31, 2019 USD ($)
Revenue, Major Customer [Line Items]
NES's % of operating revenues	800.00%
Sales of Electricity	$ 2,270	$ 2,532
Electric revenue	2,268	2,531
Off System Sales of Electricity	2
Other revenue	34	46
Revenues	2,304	2,578
Bill credits for LTA	$ 42	34
Number of LPCs signed LTA | Units	142
Number of LPCs signed Flexibility Agreement | Units	68
Percent of sales of electricity to LPCs	92.00%
Pandemic Relief Credit	$ 200
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	2,091	2,357
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	154	150
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	25	25
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue	334	369
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue	58	63
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue	137	157
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue	212	237
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue	16	18
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue	1,501	1,676
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue	$ 10	$ 11

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Bill credits for LTA

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Revenue from sales of electricity

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NES's % of operating revenues

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Number of LPCs signed Flexibility Agreement

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Off System Sales of Electricity

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Other revenue

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Percent of sales of electricity to LPCs

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Sales of Electricity

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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