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Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	$ 3,476	$ 3,093	$ 6,352	$ 5,824
Electric revenue	(3,477)	(3,091)	(6,352)	(5,823)
Off System Sales of Electricity	1	2	2	4
Pre-commercial Ops - capitalized revenue	2	0	2	(3)
Unregulated Operating Revenue	56	61	100	95
Regulated and Unregulated Operating Revenue	$ 3,532	3,154	$ 6,452	$ 5,919
Total long duration contract revenue recognition	3,199		5,815
Percent of wholesale Credit offered			310.00%
Percent of Generation Flexibility Credit			5.00%
NES's % of operating revenues			800.00%	800.00%
Percent of Generation Flexibility Credit			5.00%
MLGW's % of operating revenues			700.00%	700.00%
ALABAMA
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	$ 520	457	$ 951	$ 865
GEORGIA
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	94	80	168	149
KENTUCKY
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	214	201	396	378
MISSISSIPPI
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	307	284	576	539
NORTH CAROLINA
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	28	28	49	51
TENNESSEE
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	2,298	2,027	4,184	3,816
VIRGINIA
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	$ 16	$ 14	$ 28	$ 25

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MLGW's % of operating revenues

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Off System Sales of Electricity

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Percent of Generation Flexibility Credit

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Pre-commercial Ops - capitalized revenue

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Total long duration contract revenue recognition

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