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Revenue Customer Type (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) Units	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) Units	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)
Revenue, Major Customer [Line Items]
NES's % of operating revenues			800.00%
Sales of Electricity	$ 2,533	$ 2,489	$ 4,803	$ 5,021
Electric revenue	2,531	2,488	4,799	5,019
Off System Sales of Electricity	2		4	2
Other revenue	39	32	73	78
Revenues	2,572	2,521	4,876	5,099
Bill credits for LTA	$ 48	36	$ 90	70
Number of LPCs signed LTA | Units	142		142
Number of LPCs signed Flexibility Agreement | Units	71		71
Percent of sales of electricity to LPCs			92.00%
Pandemic Relief Credit	$ (55)		$ (104)		$ 200
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	2,337	2,301	4,428	4,658
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	168	160	322	310
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	28	28	53	53
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue	379	360	713	729
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue	66	64	124	127
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue	157	158	294	315
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue	237	227	449	464
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue	18	19	34	37
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue	1,663	1,648	3,164	3,324
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue	$ 11	$ 12	$ 21	$ 23

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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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