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Segment and Related Information - Schedule of Traditional Electric Companies (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
segment
Jun. 30, 2024
USD ($)
Segment Reporting Information [Line Items]            
Total operating revenues $ 6,973   $ 6,463   $ 14,748 $ 13,109
Total utility operations and maintenance 1,685   1,388   3,305 2,860
Other segment items 3,617   3,125   7,812 6,656
Depreciation and amortization 1,323   1,182   2,608 2,327
Interest expense(c) 874   694   1,588 1,358
Income taxes (benefit) 289   290   569 513
Consolidated Net Income Attributable to Southern Company 880   1,203   $ 2,214 2,332
Traditional Electric Operating Companies            
Segment Reporting Information [Line Items]            
Number of reportable segments | segment         1  
ALABAMA POWER CO            
Segment Reporting Information [Line Items]            
Total operating revenues 1,968   1,873   $ 3,980 3,664
Total utility operations and maintenance 472   429   935 840
Depreciation and amortization 371   364   741 725
Interest expense(c) 116   114   225 224
Income taxes (benefit) 115   102   226 187
Consolidated Net Income Attributable to Southern Company 381 $ 375 369 $ 333 755 702
GEORGIA POWER CO            
Segment Reporting Information [Line Items]            
Total operating revenues 3,110   2,875   6,148 5,273
Total utility operations and maintenance 645   438   1,283 953
Depreciation and amortization 512   447   1,015 872
Interest expense(c) 198   185   385 359
Income taxes (benefit) 236   192   334 271
Consolidated Net Income Attributable to Southern Company 607 596 762 437 1,204 1,199
GEORGIA POWER CO | Disposal Group, Held-for-Sale, Not Discontinued Operations            
Segment Reporting Information [Line Items]            
Gain (loss) on sale     114     114
Gain (loss) on sale, after tax     84     84
MISSISSIPPI POWER CO            
Segment Reporting Information [Line Items]            
Total operating revenues 400   364   821 706
Total utility operations and maintenance 82   83   166 171
Depreciation and amortization 52   47   105 93
Interest expense(c) 20   20   40 39
Income taxes (benefit) 17   15   34 25
Consolidated Net Income Attributable to Southern Company 59 $ 55 61 $ 50 114 111
SOUTHERN POWER CO            
Segment Reporting Information [Line Items]            
Total operating revenues 546   524   1,113 997
Total utility operations and maintenance 135   119   257 241
Depreciation and amortization 177   127   329 245
Interest expense(c) 24   30   50 59
Income taxes (benefit) (2)   13   (3) (1)
Consolidated Net Income Attributable to Southern Company 51   86   $ 138 182
Number of reportable segments | segment         1  
Reportable Segment | ALABAMA POWER CO            
Segment Reporting Information [Line Items]            
Total operating revenues 1,968   1,873   $ 3,980 3,664
Rate RSE expenses 374   339   739 664
Rate CNP Compliance expenses 67   66   142 129
Total utility operations and maintenance 441   405   881 793
Other segment items 544   519   1,152 1,033
Depreciation and amortization 371   364   741 725
Interest expense(c) 116   114   225 224
Income taxes (benefit) 115   102   226 187
Consolidated Net Income Attributable to Southern Company 381   369   755 702
Capital expenditures 599   470   1,159 921
Reportable Segment | GEORGIA POWER CO            
Segment Reporting Information [Line Items]            
Total operating revenues 3,110   2,875   6,148 5,273
Total utility operations and maintenance 568   499   1,104 962
Other segment items 989   790   2,106 1,610
Depreciation and amortization 512   447   1,015 872
Interest expense(c) 198   185   385 359
Income taxes (benefit) 236   192   334 271
Consolidated Net Income Attributable to Southern Company 607   762   1,204 1,199
Capital expenditures 1,676   1,320   3,313 2,353
Reportable Segment | MISSISSIPPI POWER CO            
Segment Reporting Information [Line Items]            
Other segment items 252   221   528 438
Reportable Segment | SOUTHERN POWER CO            
Segment Reporting Information [Line Items]            
Other segment items $ 296   268   $ 599 512
Traditional Electric Operating Companies            
Segment Reporting Information [Line Items]            
Number of reportable segments | segment         1  
Traditional Electric Operating Companies | GEORGIA POWER CO | Plant Vogtle Units 3 And 4            
Segment Reporting Information [Line Items]            
Credit on plant vogtle units 3 and 4     21     21
After tax credit on plant vogtle units 3 and 4     $ 16     $ 16