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Revenue Customer Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Revenue, Major Customer [Line Items]
MLGW's % of operating revenues			800.00%
Sales of Electricity	$ 2,489	$ 2,712	$ 5,021	$ 5,393
Electric revenue	2,488	2,712	5,019	5,392
Off System Sales of Electricity	1	0	2	1
Other revenue	32	38	78	82
Revenues	2,521	2,750	5,099	5,475
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	2,301	2,514	4,658	4,981
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	160	168	310	353
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	28	30	53	59
ALABAMA
Revenue, Major Customer [Line Items]
Electric revenue	360	387	729	779
GEORGIA
Revenue, Major Customer [Line Items]
Electric revenue	64	70	127	137
KENTUCKY
Revenue, Major Customer [Line Items]
Electric revenue	158	173	315	341
MISSISSIPPI
Revenue, Major Customer [Line Items]
Electric revenue	227	249	464	501
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Electric revenue	19	21	37	41
TENNESSEE
Revenue, Major Customer [Line Items]
Electric revenue	1,648	1,799	3,324	3,568
VIRGINIA
Revenue, Major Customer [Line Items]
Electric revenue	$ 12	$ 13	$ 23	$ 25

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Revenue from sales of electricity

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MLGW's % of operating revenues

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Off System Sales of Electricity

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Other revenue

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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