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Revenue Customer Type (Details) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($) Units	Dec. 31, 2022 USD ($)
Revenue, Major Customer [Line Items]
MLGW's % of operating revenues	800.00%
NES's % of operating revenues	800.00%
Off System Sales of Electricity	$ 2
Bill credits for LTA	$ (47)	$ (48)
Number of LPCs signed LTA | Units	147
Number of LPCs signed Flexibility Agreement | Units	92
Percent of sales of electricity to LPCs	91.00%
Pre-commercial Ops - capitalized revenue	$ (3)	0
Regulated Operating Revenue	2,731	2,963
Regulated and Unregulated Operating Revenue	2,765	3,015
lpcs [Domain]
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	2,487	2,706
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	217	225
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	30	32
ALABAMA
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	408	428
GEORGIA
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	69	76
KENTUCKY
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	177	198
MISSISSIPPI
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	255	278
NORTH CAROLINA
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	23	25
TENNESSEE
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	1,789	1,941
VIRGINIA
Revenue, Major Customer [Line Items]
Regulated Operating Revenue	$ 11	$ 13

X

- Definition

Bill credits for LTA

+ References

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+ Details

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X

- Definition

MLGW's % of operating revenues

+ References

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X

- Definition

NES's % of operating revenues

+ References

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+ Details

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- Definition

Number of LPCs signed Flexibility Agreement

+ References

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- Definition

Number of LPCs signed LTA

+ References

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- Definition

Off System Sales of Electricity

+ References

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- Definition

Percent of sales of electricity to LPCs

+ References

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- Definition

Pre-commercial Ops - capitalized revenue

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The total amount of operating revenues recognized during the period.

+ References

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- Definition

The total amount of regulated operating revenues recognized during the period.

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