REGULATORY MATTERS - APC Rate ECR (Details) - Alabama Power $ in Millions		1 Months Ended					12 Months Ended
	Nov. 09, 2023 USD ($) $ / KWH_Kilowatt_hour	Jan. 31, 2025 $ / KWH_Kilowatt_hour	Dec. 31, 2022 USD ($) $ / KWH_Kilowatt_hour	Nov. 30, 2022 $ / KWH_Kilowatt_hour	Aug. 31, 2022 USD ($) $ / KWH_Kilowatt_hour	Jul. 31, 2022 $ / KWH_Kilowatt_hour	Dec. 31, 2023 USD ($) $ / KWH_Kilowatt_hour	Feb. 28, 2022 USD ($)
Schedule of Regulatory Assets and Liabilities [Line Items]
Current billing rates under rate ECR (usd per KWH) | $ / KWH_Kilowatt_hour	3.270		3.510	2.557	2.557	1.960	0.05910
Current billing rates under rate ECR, amount	$ 126		$ 500		$ 310
Rate RSE refund liability, portion attributable to reduce under recovered balance								$ 126
Over (under) recovered fuel cost			(622)				$ (246)
Regulatiry Assets, Under Recovered Fuel Clause Revenues
Schedule of Regulatory Assets and Liabilities [Line Items]
Over (under) recovered fuel cost			(102)				$ (246)
Other regulatory assets, deferred
Schedule of Regulatory Assets and Liabilities [Line Items]
Over (under) recovered fuel cost			$ (520)
Scenario, Forecast
Schedule of Regulatory Assets and Liabilities [Line Items]
Current billing rates under rate ECR (usd per KWH) | $ / KWH_Kilowatt_hour		0.05910