v3.25.0.1
REGULATORY MATTERS - APC Rate ECR (Details) - Alabama Power
$ in Millions
1 Months Ended 12 Months Ended
May 08, 2024
USD ($)
$ / KWH_Kilowatt_hour
Jan. 31, 2026
$ / KWH_Kilowatt_hour
Jan. 31, 2025
USD ($)
$ / KWH_Kilowatt_hour
Dec. 31, 2023
USD ($)
$ / 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, 2024
USD ($)
$ / KWH_Kilowatt_hour
Schedule of Regulatory Assets and Liabilities [Line Items]                  
Current billing rates under rate ECR (usd per KWH) | $ / KWH_Kilowatt_hour 0.03015     0.03270 3.510 2.557 2.557 1.960 0.05910
Current billing rates under rate ECR, amount $ 135     $ 126 $ 500   $ 310    
Over (under) recovered fuel cost       $ (246)         $ (29)
Scenario, Forecast                  
Schedule of Regulatory Assets and Liabilities [Line Items]                  
Current billing rates under rate ECR (usd per KWH) | $ / KWH_Kilowatt_hour   0.05910 0.02600            
Current billing rates under rate ECR, amount     $ 218