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FINANCING - Notes Payable (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 2,314 | $ 2,609
Weighted Average Interest Rate | 5.70% | 4.90%
Commercial paper |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 1,794 | $ 809
Weighted Average Interest Rate | 5.60% | 4.70%
Short-term bank debt |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 520 | $ 1,800
Weighted Average Interest Rate | 6.40% | 5.00%
Alabama Power |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 40 | $ 0
Alabama Power | Commercial paper |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 40 | $ 0
Weighted Average Interest Rate | 5.50% | 0.00%
Georgia Power |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 1,329 | $ 1,600
Weighted Average Interest Rate | 5.90% | 5.00%
Georgia Power | Commercial paper |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 809 | $ 0
Weighted Average Interest Rate | 5.60% | 0.00%
Georgia Power | Short-term bank debt |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 520 | $ 1,600
Weighted Average Interest Rate | 6.40% | 5.00%
Southern Power |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 138 | $ 225
Southern Power | Commercial paper |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 138 | $ 225
Weighted Average Interest Rate | 5.50% | 4.70%
Southern Company Gas |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 415 | $ 768
Southern Company Gas | Commercial paper |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 415 | $ 768
Weighted Average Interest Rate | 5.50% | 4.70%
Southern Company Gas Capital | Commercial paper |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 23 | $ 285
Weighted Average Interest Rate | 5.50% | 4.80%
Nicor Gas | Commercial paper |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 392 | $ 283
Weighted Average Interest Rate | 5.50% | 4.60%
Nicor Gas | Short-term bank debt |  |
Short-term Debt [Line Items] |  |
Amount Outstanding | $ 0 | $ 200
Weighted Average Interest Rate | 0.00% | 4.90%

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