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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Accounts Receivable | $ 3,048 | $ 2,820
Contract Assets | 323 | 271
Contract Liabilities | 140 | 116
Contract with customer, liability, revenue recognized | 98 | 36
Unregulated Distributed Generation |  |
Disaggregation of Revenue [Line Items] |  |
Contract Assets | 67 | 91
Contract Liabilities | 95 | 115
Alabama Power |  |
Disaggregation of Revenue [Line Items] |  |
Accounts Receivable | 783 | 821
Contract Assets | 3 | 2
Contract Liabilities | 11 | 0
Georgia Power |  |
Disaggregation of Revenue [Line Items] |  |
Accounts Receivable | 1,244 | 1,011
Contract Assets | 184 | 121
Contract Liabilities | 34 | 1
Mississippi Power |  |
Disaggregation of Revenue [Line Items] |  |
Accounts Receivable | 113 | 90
Contract Assets | 0 | 0
Contract Liabilities | 0 | 0
Southern Power |  |
Disaggregation of Revenue [Line Items] |  |
Accounts Receivable | 106 | 122
Contract Assets | 0 | 0
Contract Liabilities | 2 | 4
Southern Company Gas |  |
Disaggregation of Revenue [Line Items] |  |
Accounts Receivable | 660 | 684
Contract Assets | 72 | 56
Contract Liabilities | 3 | $ 0
Southern Company Gas | Energy Efficiency Enhancement And Upgrade |  |
Disaggregation of Revenue [Line Items] |  |
Contract Liabilities | $ 68 |

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