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CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Southern Company (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Equity investments in unconsolidated subsidiaries $ 1,416 $ 1,368
Southern Holdings Company    
Schedule of Equity Method Investments [Line Items]    
Equity investments in unconsolidated subsidiaries $ 128 $ 126