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Segment and Related Information - Schedule of Southern Power (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 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 778 714
Income taxes (benefit) 228 280
Net income 1,356 1,334
Loss from extinguishment of debt 11  
Loss from extinguishment of debt, net of tax 8  
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 471 434
Income taxes (benefit) 305 355
Net income 1,564 1,531
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 0 0
Income taxes (benefit) 0 0
Net income 6 9
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 307 280
Income taxes (benefit) (77) (75)
Net income (214) (206)
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 27 26
Income taxes (benefit) (70) (1)
Net income 4 87
SOUTHERN POWER CO | Kay Wind Facility    
Segment Reporting Information [Line Items]    
Depreciation before tax 154 27
Depreciation after tax 120 20
Reportable Segment | SOUTHERN POWER CO    
Segment Reporting Information [Line Items]    
Operating revenues 681 567
Other segment items 442 303
Depreciation and amortization(b) 278 152
Interest expense 27 26
Income taxes (benefit) (70) (1)
Net income 4 87
Traditional Electric Operating Companies | Operating Segments    
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 339 316
Income taxes (benefit) 230 226
Net income 1,113 1,026
SOUTHERN POWER CO | Operating Segments    
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 27 26
Income taxes (benefit) (70) (1)
Net income 4 87
Electric Utilities | Operating Segments    
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 366 342
Income taxes (benefit) 160 225
Net income 1,117 1,113
Electric Utilities | Eliminations    
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 0 0
Income taxes (benefit) 0 0
Net income 0 0
SOUTHERN Co GAS | Operating Segments    
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 105 92
Income taxes (benefit) 145 130
Net income $ 447 $ 418