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FINANCING - Outstanding Classes of Capital Stock Narrative (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2024 shares
Debt Instrument [Line Items] |
Stock issued employee and director stock plans (in shares) | 5.8
Number of shares reserved for issuance to stock-based compensation plan (in shares) | 177.0
Southern Company Common Stock |
Debt Instrument [Line Items] |
Remaining shares available for awards (in shares) | 25.0

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