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PROPERTY, PLANT, AND EQUIPMENT - Deferred Cloud Implementation Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | $ 19,069 | $ 20,148 |
Deferred Cloud Implementation Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 325 | 345 |
Amortization | 46 | 29 | $ 0
Alabama Power |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 5,090 | 5,372 |
Alabama Power | Deferred Cloud Implementation Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 85 | 81 |
Amortization | 11 | 8 | 0
Georgia Power |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 10,200 | 11,117 |
Georgia Power | Deferred Cloud Implementation Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 99 | 108 |
Amortization | 19 | 12 | 0
Mississippi Power |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 887 | 828 |
Mississippi Power | Deferred Cloud Implementation Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 13 | 14 |
Amortization | 0 | 0 | 0
Southern Power |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 998 | 956 |
Southern Power | Deferred Cloud Implementation Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 15 | 18 |
Amortization | 0 | 0 | 0
Southern Company Gas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 890 | 882 |
Southern Company Gas | Deferred Cloud Implementation Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total deferred charges and other assets | 43 | 54 |
Amortization | $ 8 | $ 0 | $ 0

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets, excluding Property, Plant, and Equipment and Other Property and Investments, that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. + References No definition available. + Details
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