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Segment and Related Information - Schedule of Financial Data for Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]      
Operating revenues $ 8,397 $ 7,775  
Other segment items 4,665 4,193  
Depreciation and amortization(b) 1,420 1,286  
Earnings from equity method investments 50 32  
Interest expense(c) 778 714  
Income taxes (benefit) 228 280  
Consolidated Net Income Attributable to Southern Company 1,356 1,334  
Goodwill 5,161   $ 5,161
Total assets 157,031   155,720
Loss from extinguishment of debt 11    
Loss from extinguishment of debt, net of tax 8    
SOUTHERN POWER CO      
Segment Reporting Information [Line Items]      
Operating revenues 681 567  
Depreciation and amortization(b) 278 152  
Earnings from equity method investments 0 0  
Interest expense(c) 27 26  
Income taxes (benefit) (70) (1)  
Consolidated Net Income Attributable to Southern Company 4 87  
Total assets 12,474   12,657
SOUTHERN POWER CO | Kay Wind Facility      
Segment Reporting Information [Line Items]      
Depreciation before tax 154 27  
Depreciation after tax 120 20  
SOUTHERN Co GAS      
Segment Reporting Information [Line Items]      
Operating revenues 2,191 1,839  
Other segment items 1,357 1,069  
Depreciation and amortization(b) 183 169  
Earnings from equity method investments 46 39  
Interest expense(c) 105 92  
Income taxes (benefit) 145 130  
Consolidated Net Income Attributable to Southern Company 447 418  
Goodwill 5,015   5,015
Total assets 27,551   27,387
GEORGIA POWER CO      
Segment Reporting Information [Line Items]      
Operating revenues 3,142 3,037  
Depreciation and amortization(b) 484 503  
Interest expense(c) 204 187  
Income taxes (benefit) 85 98  
Consolidated Net Income Attributable to Southern Company 628 596  
Total assets 69,720   68,077
ALABAMA POWER CO      
Segment Reporting Information [Line Items]      
Operating revenues 2,092 2,012  
Depreciation and amortization(b) 381 370  
Interest expense(c) 115 108  
Income taxes (benefit) 129 111  
Consolidated Net Income Attributable to Southern Company 425 375  
Total assets 38,151   38,124
Operating Segments      
Segment Reporting Information [Line Items]      
Operating revenues 8,213 7,594  
Other segment items 4,515 4,043  
Depreciation and amortization(b) 1,403 1,268  
Earnings from equity method investments 45 37  
Interest expense(c) 471 434  
Income taxes (benefit) 305 355  
Consolidated Net Income Attributable to Southern Company 1,564 1,531  
Goodwill 5,017   5,017
Total assets 155,141   153,416
Operating Segments | SOUTHERN Co GAS      
Segment Reporting Information [Line Items]      
Operating revenues 2,193 1,839  
Other segment items 1,360 1,072  
Depreciation and amortization(b) 182 168  
Earnings from equity method investments 46 39  
Interest expense(c) 101 92  
Income taxes (benefit) 155 139  
Consolidated Net Income Attributable to Southern Company 441 407  
Total assets 29,396   28,615
Operating Segments | Electric Utilities      
Segment Reporting Information [Line Items]      
Operating revenues 6,022 5,755  
Other segment items 3,158 2,974  
Depreciation and amortization(b) 1,220 1,099  
Earnings from equity method investments (1) (2)  
Interest expense(c) 366 342  
Income taxes (benefit) 160 225  
Consolidated Net Income Attributable to Southern Company 1,117 1,113  
Goodwill 2   2
Total assets 127,590   126,029
Operating Segments | Traditional Electric Operating Companies      
Segment Reporting Information [Line Items]      
Operating revenues 5,482 5,311  
Other segment items 2,857 2,794  
Depreciation and amortization(b) 942 947  
Earnings from equity method investments (1) (2)  
Interest expense(c) 339 316  
Income taxes (benefit) 230 226  
Consolidated Net Income Attributable to Southern Company 1,113 1,026  
Goodwill 0   0
Total assets 115,965   114,287
Operating Segments | SOUTHERN POWER CO      
Segment Reporting Information [Line Items]      
Operating revenues 681 567  
Other segment items 442 303  
Depreciation and amortization(b) 278 152  
Earnings from equity method investments 0 0  
Interest expense(c) 27 26  
Income taxes (benefit) (70) (1)  
Consolidated Net Income Attributable to Southern Company 4 87  
Goodwill 2   2
Total assets 12,474   12,657
Operating Segments | SOUTHERN Co GAS      
Segment Reporting Information [Line Items]      
Operating revenues 2,191 1,839  
Other segment items 1,357 1,069  
Depreciation and amortization(b) 183 169  
Earnings from equity method investments 46 39  
Interest expense(c) 105 92  
Income taxes (benefit) 145 130  
Consolidated Net Income Attributable to Southern Company 447 418  
Goodwill 5,015   5,015
Total assets 27,551   27,387
Eliminations      
Segment Reporting Information [Line Items]      
Operating revenues (34) (48)  
Other segment items (40) (58)  
Depreciation and amortization(b) 0 0  
Earnings from equity method investments 0 (1)  
Interest expense(c) 0 0  
Income taxes (benefit) 0 0  
Consolidated Net Income Attributable to Southern Company 6 9  
Goodwill 0   0
Total assets (794)   (525)
Eliminations | SOUTHERN Co GAS      
Segment Reporting Information [Line Items]      
Operating revenues (4) (4)  
Other segment items (4) (4)  
Depreciation and amortization(b) 0 0  
Earnings from equity method investments 0 0  
Interest expense(c) 0 0  
Income taxes (benefit) 0 0  
Consolidated Net Income Attributable to Southern Company 0 0  
Total assets (13,121)   (11,871)
Eliminations | Electric Utilities      
Segment Reporting Information [Line Items]      
Operating revenues (141) (123)  
Other segment items (141) (123)  
Depreciation and amortization(b) 0 0  
Earnings from equity method investments 0 0  
Interest expense(c) 0 0  
Income taxes (benefit) 0 0  
Consolidated Net Income Attributable to Southern Company 0 0  
Goodwill 0   0
Total assets (849)   (915)
All Other      
Segment Reporting Information [Line Items]      
Operating revenues 218 229  
Other segment items 190 208  
Depreciation and amortization(b) 17 18  
Earnings from equity method investments 5 (4)  
Interest expense(c) 307 280  
Income taxes (benefit) (77) (75)  
Consolidated Net Income Attributable to Southern Company (214) (206)  
Goodwill 144   144
Total assets 2,684   2,829
All Other | SOUTHERN Co GAS      
Segment Reporting Information [Line Items]      
Operating revenues 2 4  
Other segment items 1 1  
Depreciation and amortization(b) 1 1  
Earnings from equity method investments 0 0  
Interest expense(c) 4 0  
Income taxes (benefit) (10) (9)  
Consolidated Net Income Attributable to Southern Company 6 $ 11  
Total assets $ 11,276   $ 10,643