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Segment and Related Information - Schedule of Financial Data for Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]              
Operating revenues $ 6,973   $ 6,463   $ 14,748 $ 13,109  
Other segment items 3,617   3,125   7,812 6,656  
Depreciation and amortization 1,323   1,182   2,608 2,327  
Earnings from equity method investments 10   31   43 77  
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  
Goodwill 5,161       5,161   $ 5,161
Total assets 148,853       148,853   145,180
Loss from extinguishment of debt 129       129    
Loss from extinguishment of debt, net of tax         97    
SOUTHERN POWER CO              
Segment Reporting Information [Line Items]              
Operating revenues 546   524   1,113 997  
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  
Total assets 12,817       12,817   12,653
SOUTHERN POWER CO | Kay Wind Facility              
Segment Reporting Information [Line Items]              
Depreciation before tax 42       69    
Depreciation after tax 31       51    
SOUTHERN Co GAS              
Segment Reporting Information [Line Items]              
Operating revenues 979   831   2,818 2,538  
Other segment items 599   478   1,670 1,443  
Depreciation and amortization 172   158   341 313  
Earnings from equity method investments 23   32   62 76  
Interest expense(c) 92   83   183 167  
Income taxes (benefit) 33   36   162 174  
Consolidated Net Income Attributable to Southern Company 106 $ 418 108 $ 409 524 517  
Goodwill 5,015       5,015   5,015
Total assets 26,376       26,376   26,177
GEORGIA POWER CO              
Segment Reporting Information [Line Items]              
Operating revenues 3,110   2,875   6,148 5,273  
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  
Total assets 63,851       63,851   61,255
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  
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  
Operating Segments              
Segment Reporting Information [Line Items]              
Operating revenues 6,783   6,287   14,378 12,809  
Other segment items 3,447   2,975   7,492 6,369  
Depreciation and amortization 1,306   1,165   2,575 2,291  
Earnings from equity method investments 27   32   64 78  
Interest expense(c) 452   436   885 861  
Income taxes (benefit) 401   357   755 655  
Consolidated Net Income Attributable to Southern Company 1,204   1,386   2,735 2,711  
Goodwill 5,017       5,017   5,017
Total assets 146,856       146,856   143,382
Operating Segments | SOUTHERN Co GAS              
Segment Reporting Information [Line Items]              
Operating revenues 976   827   2,815 2,533  
Other segment items 595   474   1,668 1,443  
Depreciation and amortization 171   157   340 312  
Earnings from equity method investments 23   32   62 76  
Interest expense(c) 92   87   183 174  
Income taxes (benefit) 27   30   165 172  
Consolidated Net Income Attributable to Southern Company 114   111   521 508  
Total assets 28,138       28,138   27,336
Operating Segments | Electric Utilities              
Segment Reporting Information [Line Items]              
Operating revenues 5,804   5,456   11,560 10,271  
Other segment items 2,848   2,497   5,822 4,926  
Depreciation and amortization 1,134   1,007   2,234 1,978  
Earnings from equity method investments 4   0   2 2  
Interest expense(c) 360   353   702 694  
Income taxes (benefit) 368   321   593 481  
Consolidated Net Income Attributable to Southern Company 1,098   1,278   2,211 2,194  
Goodwill 2       2   2
Total assets 120,480       120,480   117,205
Operating Segments | Traditional Electric Operating Companies              
Segment Reporting Information [Line Items]              
Operating revenues 5,380   5,025   10,692 9,463  
Other segment items 2,674   2,322   5,468 4,603  
Depreciation and amortization 957   880   1,905 1,733  
Earnings from equity method investments 4   0   2 2  
Interest expense(c) 336   323   652 635  
Income taxes (benefit) 370   308   596 482  
Consolidated Net Income Attributable to Southern Company 1,047   1,192   2,073 2,012  
Goodwill 0       0   0
Total assets 108,676       108,676   105,577
Operating Segments | SOUTHERN POWER CO              
Segment Reporting Information [Line Items]              
Operating revenues 546   524   1,113 997  
Other segment items 296   268   599 512  
Depreciation and amortization 177   127   329 245  
Earnings from equity method investments 0   0   0 0  
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  
Goodwill 2       2   2
Total assets 12,817       12,817   12,653
Operating Segments | SOUTHERN Co GAS              
Segment Reporting Information [Line Items]              
Operating revenues 979   831   2,818 2,538  
Other segment items 599   478   1,670 1,443  
Depreciation and amortization 172   158   341 313  
Earnings from equity method investments 23   32   62 76  
Interest expense(c) 92   83   183 167  
Income taxes (benefit) 33   36   162 174  
Consolidated Net Income Attributable to Southern Company 106   108   524 517  
Goodwill 5,015       5,015   5,015
Total assets 26,376       26,376   26,177
Eliminations              
Segment Reporting Information [Line Items]              
Operating revenues (35)   (46)   (84) (83)  
Other segment items (23)   (43)   (81) (60)  
Depreciation and amortization 0   0   0 0  
Earnings from equity method investments 0   0   0 1  
Interest expense(c) 0   (1)   0 (11)  
Income taxes (benefit) 0   0   0 0  
Consolidated Net Income Attributable to Southern Company (12)   (2)   (3) (11)  
Goodwill 0       0   0
Total assets (420)       (420)   (573)
Eliminations | SOUTHERN Co GAS              
Segment Reporting Information [Line Items]              
Operating revenues (2)   (3)   (6) (8)  
Other segment items (2)   (3)   (6) (8)  
Depreciation and amortization 0   0   0 0  
Earnings from equity method investments 0   0   0 0  
Interest expense(c) 0   0   0 0  
Income taxes (benefit) 0   0   0 0  
Consolidated Net Income Attributable to Southern Company 0   0   0 0  
Total assets (12,254)       (12,254)   (11,206)
Eliminations | Electric Utilities              
Segment Reporting Information [Line Items]              
Operating revenues (122)   (93)   (245) (189)  
Other segment items (122)   (93)   (245) (189)  
Depreciation and amortization 0   0   0 0  
Earnings from equity method investments 0   0   0 0  
Interest expense(c) 0   0   0 0  
Income taxes (benefit) 0   0   0 0  
Consolidated Net Income Attributable to Southern Company 0   0   0 0  
Goodwill 0       0   0
Total assets (1,013)       (1,013)   (1,025)
All Other              
Segment Reporting Information [Line Items]              
Operating revenues 225   222   454 383  
Other segment items 193   193   401 347  
Depreciation and amortization 17   17   33 36  
Earnings from equity method investments (17)   (1)   (21) (2)  
Interest expense(c) 422   259   703 508  
Income taxes (benefit) (112)   (67)   (186) (142)  
Consolidated Net Income Attributable to Southern Company (312)   (181)   (518) (368)  
Goodwill 144       144   144
Total assets 2,417       2,417   2,371
All Other | SOUTHERN Co GAS              
Segment Reporting Information [Line Items]              
Operating revenues 5   7   9 13  
Other segment items 6   7   8 8  
Depreciation and amortization 1   1   1 1  
Earnings from equity method investments 0   0   0 0  
Interest expense(c) 0   (4)   0 (7)  
Income taxes (benefit) 6   $ 6   (3) 2  
Consolidated Net Income Attributable to Southern Company (8)       3 $ 9  
Total assets $ 10,492       $ 10,492   $ 10,047