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Segment and Related Information - Schedule of Traditional Electric Companies (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Segment Reporting Information [Line Items]                
Total operating revenues $ 7,823     $ 7,274     $ 22,572 $ 20,383
Utility operations and maintenance                
Total utility operations and maintenance 1,643     1,662     4,948 4,522
Other segment items 3,564     3,491     11,377 10,146
Depreciation and amortization 1,422     1,210     4,030 3,537
Interest expense(e) 755     692     2,343 2,050
Income taxes (benefit) 404     377     973 890
Consolidated Net Income Attributable to Southern Company 1,711     1,535     $ 3,925 3,867
Traditional Electric Operating Companies                
Utility operations and maintenance                
Number of reportable segments | segment             1  
ALABAMA POWER CO                
Segment Reporting Information [Line Items]                
Total operating revenues 2,318     2,138     $ 6,298 5,803
Utility operations and maintenance                
Total utility operations and maintenance 434     493     1,370 1,335
Depreciation and amortization 380     366     1,121 1,091
Interest expense(e) 119     113     343 337
Income taxes (benefit) 175     135     401 322
Consolidated Net Income Attributable to Southern Company 588 $ 381 $ 375 493 $ 369 $ 333 1,343 1,195
Pre tax impairment loss               36
After tax impairment               27
GEORGIA POWER CO                
Segment Reporting Information [Line Items]                
Total operating revenues 3,770     3,472     9,918 8,745
Utility operations and maintenance                
Total utility operations and maintenance 616     613     1,897 1,565
Depreciation and amortization 526     462     1,541 1,334
Interest expense(e) 200     184     585 543
Income taxes (benefit) 278     246     612 516
Consolidated Net Income Attributable to Southern Company 1,248 607 596 1,050 762 437 2,452 2,249
GEORGIA POWER CO | Disposal Group, Held-for-Sale, Not Discontinued Operations                
Utility operations and maintenance                
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 480     412     1,301 1,118
Utility operations and maintenance                
Total utility operations and maintenance 94     90     261 261
Depreciation and amortization 53     48     157 141
Interest expense(e) 19     19     59 58
Income taxes (benefit) 24     22     58 47
Consolidated Net Income Attributable to Southern Company 84 $ 59 $ 55 75 $ 61 $ 50 198 186
SOUTHERN POWER CO                
Segment Reporting Information [Line Items]                
Total operating revenues 613     600     1,726 1,597
Utility operations and maintenance                
Total utility operations and maintenance 128     126     384 367
Depreciation and amortization 247     133     576 378
Interest expense(e) 25     30     76 89
Income taxes (benefit) 6     33     3 32
Consolidated Net Income Attributable to Southern Company 3     82     $ 141 264
Number of reportable segments | segment             1  
Reportable Segment | ALABAMA POWER CO                
Segment Reporting Information [Line Items]                
Total operating revenues 2,318     2,138     $ 6,298 5,803
Utility operations and maintenance                
Rate RSE expenses 346     365     1,085 1,028
Rate CNP Compliance expenses 69     72     211 202
Total utility operations and maintenance 415     437     1,296 1,230
Other segment items 641     594     1,794 1,628
Depreciation and amortization 380     366     1,121 1,091
Interest expense(e) 119     113     343 337
Income taxes (benefit) 175     135     401 322
Consolidated Net Income Attributable to Southern Company 588     493     1,343 1,195
Capital expenditures 537     483     1,696 1,404
Reportable Segment | GEORGIA POWER CO                
Segment Reporting Information [Line Items]                
Total operating revenues 3,770     3,472     9,918 8,745
Utility operations and maintenance                
Total utility operations and maintenance 576     549     1,680 1,510
Other segment items 942     981     3,048 2,593
Depreciation and amortization 526     462     1,541 1,334
Interest expense(e) 200     184     585 543
Income taxes (benefit) 278     246     612 516
Consolidated Net Income Attributable to Southern Company 1,248     1,050     2,452 2,249
Capital expenditures 1,961     1,557     5,273 3,910
Reportable Segment | MISSISSIPPI POWER CO                
Segment Reporting Information [Line Items]                
Total operating revenues 480     412     1,301 1,118
Operational expenses 46     45     134 127
Environmental compliance expenses 3     3     9 9
Utility operations and maintenance                
Other segment items 251     200     686 550
Depreciation and amortization 53     48     157 141
Interest expense(e) 19     19     59 58
Income taxes (benefit) 24     22     58 47
Consolidated Net Income Attributable to Southern Company 84     75     198 186
Capital expenditures 86     133     225 259
Reportable Segment | SOUTHERN POWER CO                
Segment Reporting Information [Line Items]                
Total operating revenues 613     600     1,726 1,597
Utility operations and maintenance                
Other segment items 332     322     930 834
Depreciation and amortization 247     133     576 378
Interest expense(e) 25     30     76 89
Income taxes (benefit) 6     33     3 32
Consolidated Net Income Attributable to Southern Company 3     82     $ 141 264
Traditional Electric Operating Companies                
Utility operations and maintenance                
Number of reportable segments | segment             1  
Traditional Electric Operating Companies | GEORGIA POWER CO | Plant Vogtle Units 3 And 4                
Utility operations and maintenance                
Credit on plant vogtle units 3 and 4 (33)     21     $ (33) 21
After tax credit on plant vogtle units 3 and 4 $ (25)     $ 16     $ (25) $ 16