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FINANCING - Maturities of Long-Term Debt (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]  
2023 $ 4,293
2024 2,280
2025 1,699
2026 3,726
2027 2,074
Alabama Power  
Debt Instrument [Line Items]  
2023 301
2024 23
2025 251
2026 46
2027 550
Georgia Power  
Debt Instrument [Line Items]  
2023 901
2024 499
2025 145
2026 445
2027 510
Mississippi Power  
Debt Instrument [Line Items]  
2023 1
2024 201
2025 12
2026 1
2027 11
Southern Power  
Debt Instrument [Line Items]  
2023 290
2024 0
2025 500
2026 964
2027 0
Southern Power | Euro-denominated Debt  
Debt Instrument [Line Items]  
2027 564
Southern Company Gas  
Debt Instrument [Line Items]  
2023 400
2024 0
2025 300
2026 530
2027 $ 154