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Segment and Related Information - Schedule of Financial Data for Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
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  
Earnings from equity method investments 33     31     76 107  
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  
Goodwill 5,161           5,161   $ 5,161
Total assets 153,248           153,248   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 613     600     1,726 1,597  
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  
Total assets 13,595           13,595   12,653
SOUTHERN POWER CO | Kay Wind Facility                  
Segment Reporting Information [Line Items]                  
Depreciation before tax 112           181    
Depreciation after tax 80           130    
SOUTHERN Co GAS                  
Segment Reporting Information [Line Items]                  
Operating revenues 734     682     3,552 3,220  
Other segment items 464     421     2,133 1,866  
Depreciation and amortization 176     162     517 475  
Earnings from equity method investments 31     34     93 110  
Interest expense(e) 94     84     277 250  
Income taxes (benefit) 6     11     169 184  
Consolidated Net Income Attributable to Southern Company 25 $ 106 $ 418 38 $ 108 $ 409 549 555  
Goodwill 5,015           5,015   5,015
Total assets 26,926           26,926   26,177
GEORGIA POWER CO                  
Segment Reporting Information [Line Items]                  
Operating revenues 3,770     3,472     9,918 8,745  
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  
Total assets 65,959           65,959   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  
ALABAMA POWER CO                  
Segment Reporting Information [Line Items]                  
Operating revenues 2,318     2,138     6,298 5,803  
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  
Total assets 37,948           37,948   36,538
Pre tax impairment loss               36  
After tax impairment               27  
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 (33)     21     (33) 21  
After tax credit on plant vogtle units 3 and 4 (25)     16     (25) 16  
Operating Segments                  
Segment Reporting Information [Line Items]                  
Operating revenues 7,662     7,104     22,040 19,913  
Other segment items 3,396     3,329     10,886 9,700  
Depreciation and amortization 1,404     1,193     3,978 3,484  
Earnings from equity method investments 33     36     97 114  
Interest expense(e) 458     433     1,343 1,293  
Income taxes (benefit) 489     447     1,246 1,101  
Consolidated Net Income Attributable to Southern Company 1,948     1,738     4,684 4,449  
Goodwill 5,017           5,017   5,017
Total assets 151,312           151,312   143,382
Operating Segments | SOUTHERN Co GAS                  
Segment Reporting Information [Line Items]                  
Operating revenues 734     677     3,549 3,210  
Other segment items 460     417     2,129 1,859  
Depreciation and amortization 175     161     516 474  
Earnings from equity method investments 31     34     93 110  
Interest expense(e) 100     84     282 257  
Income taxes (benefit) (5)     6     159 178  
Consolidated Net Income Attributable to Southern Company 35     43     556 552  
Total assets 28,335           28,335   27,336
Operating Segments | Electric Utilities                  
Segment Reporting Information [Line Items]                  
Operating revenues 6,928     6,422     18,488 16,693  
Other segment items 2,932     2,908     8,753 7,834  
Depreciation and amortization 1,228     1,031     3,461 3,009  
Earnings from equity method investments 2     2     4 4  
Interest expense(e) 364     349     1,066 1,043  
Income taxes (benefit) 483     436     1,077 917  
Consolidated Net Income Attributable to Southern Company 1,923     1,700     4,135 3,894  
Goodwill 2           2   2
Total assets 124,386           124,386   117,205
Operating Segments | Traditional Electric Operating Companies                  
Segment Reporting Information [Line Items]                  
Operating revenues 6,438     5,927     17,130 15,389  
Other segment items 2,723     2,691     8,191 7,293  
Depreciation and amortization 981     898     2,885 2,631  
Earnings from equity method investments 2     2     4 4  
Interest expense(e) 339     319     990 954  
Income taxes (benefit) 477     403     1,074 885  
Consolidated Net Income Attributable to Southern Company 1,920     1,618     3,994 3,630  
Goodwill 0           0   0
Total assets 111,734           111,734   105,577
Operating Segments | 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  
Earnings from equity method investments 0     0     0 0  
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  
Goodwill 2           2   2
Total assets 13,595           13,595   12,653
Operating Segments | SOUTHERN Co GAS                  
Segment Reporting Information [Line Items]                  
Operating revenues 734     682     3,552 3,220  
Other segment items 464     421     2,133 1,866  
Depreciation and amortization 176     162     517 475  
Earnings from equity method investments 31     34     93 110  
Interest expense(e) 94     84     277 250  
Income taxes (benefit) 6     11     169 184  
Consolidated Net Income Attributable to Southern Company 25     38     549 555  
Goodwill 5,015           5,015   5,015
Total assets 26,926           26,926   26,177
Eliminations                  
Segment Reporting Information [Line Items]                  
Operating revenues (41)     (45)     (124) (128)  
Other segment items (41)     (41)     (120) (102)  
Depreciation and amortization 0     0     0 0  
Earnings from equity method investments 0     0     0 1  
Interest expense(e) 0     (2)     0 (12)  
Income taxes (benefit) 0     0     0 0  
Consolidated Net Income Attributable to Southern Company 0     (2)     (4) (13)  
Goodwill 0           0   0
Total assets (461)           (461)   (573)
Eliminations | SOUTHERN Co GAS                  
Segment Reporting Information [Line Items]                  
Operating revenues (1)     (1)     (8) (9)  
Other segment items (1)     (1)     (8) (9)  
Depreciation and amortization 0     0     0 0  
Earnings from equity method investments 0     0     0 0  
Interest expense(e) 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 (123)     (105)     (368) (293)  
Other segment items (123)     (105)     (368) (293)  
Depreciation and amortization 0     0     0 0  
Earnings from equity method investments 0     0     0 0  
Interest expense(e) 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 (943)           (943)   (1,025)
All Other                  
Segment Reporting Information [Line Items]                  
Operating revenues 202     215     656 598  
Other segment items 209     203     611 548  
Depreciation and amortization 18     17     52 53  
Earnings from equity method investments 0     (5)     (21) (8)  
Interest expense(e) 297     261     1,000 769  
Income taxes (benefit) (85)     (70)     (273) (211)  
Consolidated Net Income Attributable to Southern Company (237)     (201)     (755) (569)  
Goodwill 144           144   144
Total assets 2,397           2,397   2,371
All Other | SOUTHERN Co GAS                  
Segment Reporting Information [Line Items]                  
Operating revenues 1     6     11 19  
Other segment items 5     5     12 16  
Depreciation and amortization 1     1     1 1  
Earnings from equity method investments 0     0     0 0  
Interest expense(e) (6)     0     (5) (7)  
Income taxes (benefit) 11     $ 5     10 6  
Consolidated Net Income Attributable to Southern Company (10)           (7) $ 3  
Total assets $ 10,845           $ 10,845   $ 10,047