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Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	$ 2,876	$ 2,731
Electric revenue	(2,875)	(2,732)
Off System Sales of Electricity	1	2
Pre-commercial Ops - capitalized revenue	0	3
Unregulated Operating Revenue	44	34
Regulated and Unregulated Operating Revenue	$ 2,920	$ 2,765
Total long duration contract revenue recognition	2,616
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	800.00%	800.00%
ALABAMA
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	$ 431	$ 408
GEORGIA
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	74	69
KENTUCKY
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	182	177
MISSISSIPPI
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	269	255
NORTH CAROLINA
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	21	23
TENNESSEE
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	1,886	1,789
VIRGINIA
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue	$ 12	$ 11

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Off System Sales of Electricity

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Total long duration contract revenue recognition

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