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Segment and Related Information - Schedule of Southern Power (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Segment Reporting Information [Line Items]        
Operating revenues $ 7,823 $ 7,274 $ 22,572 $ 20,383
Other segment items 3,564 3,491 11,377 10,146
Depreciation and amortization 1,422 1,210 4,030 3,537
Interest expense 755 692 2,343 2,050
Income taxes (benefit) 404 377 973 890
Net income 1,711 1,535 $ 3,925 3,867
SOUTHERN POWER CO        
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     1  
Operating revenues 613 600 $ 1,726 1,597
Depreciation and amortization 247 133 576 378
Interest expense 25 30 76 89
Income taxes (benefit) 6 33 3 32
Net income 3 82 141 264
SOUTHERN POWER CO | Kay Wind Facility        
Segment Reporting Information [Line Items]        
Depreciation before tax 112   181  
Depreciation after tax 80   $ 130  
Traditional Electric Operating Companies        
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     1  
Reportable Segment | SOUTHERN POWER CO        
Segment Reporting Information [Line Items]        
Operating revenues 613 600 $ 1,726 1,597
Other segment items 332 322 930 834
Depreciation and amortization 247 133 576 378
Interest expense 25 30 76 89
Income taxes (benefit) 6 33 3 32
Net income $ 3 $ 82 $ 141 $ 264