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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregate Revenue Sources (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers $ 24,828 $ 25,941 $ 23,463
Total operating revenues 25,253 29,279 23,113
Retail electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 16,894 15,839 14,244
Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 7,309 6,604 6,207
Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 5,860 5,369 4,877
Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 3,613 3,764 3,067
Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 112 102 93
Natural gas distribution revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 4,039 5,218 3,625
Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,981 2,843 1,799
Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 505 763 470
Transportation      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,184 1,186 1,038
Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 45 84 49
Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 324 342 269
Wholesale electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,981 3,120 1,851
PPA energy revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,107 2,274 1,122
PPA capacity revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 624 596 493
Non-PPA revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 250 250 236
Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 31 687 2,668
Wholesale gas services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers     2,168
Gas marketing services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 528 636 464
Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 559 51 36
Other revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,355 1,077 1,075
Other revenue sources      
Disaggregation of Revenue [Line Items]      
Other 425 3,338 3,349
Other adjustments      
Disaggregation of Revenue [Line Items]      
Other     (3,699)
Alabama Power      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 7,233 6,921 6,141
Total operating revenues 7,050 7,817 6,413
Alabama Power | Retail electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 6,565 5,844 5,470
Alabama Power | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 2,904 2,638 2,467
Alabama Power | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,928 1,685 1,600
Alabama Power | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,721 1,507 1,386
Alabama Power | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 12 14 17
Alabama Power | Natural gas distribution revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Transportation      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Wholesale electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 455 883 469
Alabama Power | PPA energy revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 234 489 184
Alabama Power | PPA capacity revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 156 194 115
Alabama Power | Non-PPA revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 65 200 170
Alabama Power | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Wholesale gas services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers     0
Alabama Power | Gas marketing services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Alabama Power | Other revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 213 194 202
Alabama Power | Other revenue sources      
Disaggregation of Revenue [Line Items]      
Other (183) 896 272
Alabama Power | Other adjustments      
Disaggregation of Revenue [Line Items]      
Other     0
Georgia Power      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 10,129 9,702 8,563
Total operating revenues 10,118 11,584 9,260
Georgia Power | Retail electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 9,378 9,049 7,940
Georgia Power | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 4,105 3,664 3,471
Georgia Power | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 3,624 3,385 3,010
Georgia Power | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,558 1,921 1,391
Georgia Power | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 91 79 68
Georgia Power | Natural gas distribution revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Transportation      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Wholesale electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 173 207 171
Georgia Power | PPA energy revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 87 130 95
Georgia Power | PPA capacity revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 51 47 55
Georgia Power | Non-PPA revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 35 30 21
Georgia Power | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Wholesale gas services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers     0
Georgia Power | Gas marketing services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Georgia Power | Other revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 578 446 452
Georgia Power | Other revenue sources      
Disaggregation of Revenue [Line Items]      
Other (11) 1,882 697
Georgia Power | Other adjustments      
Disaggregation of Revenue [Line Items]      
Other     0
Mississippi Power      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,462 1,703 1,282
Total operating revenues 1,474 1,694 1,322
Mississippi Power | Retail electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 951 946 834
Mississippi Power | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 300 302 269
Mississippi Power | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 308 299 267
Mississippi Power | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 334 336 290
Mississippi Power | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 9 9 8
Mississippi Power | Natural gas distribution revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Transportation      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Wholesale electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 472 710 417
Mississippi Power | PPA energy revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 20 16 11
Mississippi Power | PPA capacity revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 45 4 5
Mississippi Power | Non-PPA revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 407 690 401
Mississippi Power | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Wholesale gas services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers     0
Mississippi Power | Gas marketing services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Mississippi Power | Other revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 39 47 31
Mississippi Power | Other revenue sources      
Disaggregation of Revenue [Line Items]      
Other 12 (9) 40
Mississippi Power | Other adjustments      
Disaggregation of Revenue [Line Items]      
Other     0
Southern Power      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,630 2,805 1,605
Total operating revenues 2,189 3,369 2,216
Southern Power | Retail electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Natural gas distribution revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Transportation      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Wholesale electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,575 2,769 1,575
Southern Power | PPA energy revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 790 1,673 854
Southern Power | PPA capacity revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 376 356 323
Southern Power | Non-PPA revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 409 740 398
Southern Power | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Wholesale gas services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers     0
Southern Power | Gas marketing services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Power | Other revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 55 36 30
Southern Power | Other revenue sources      
Disaggregation of Revenue [Line Items]      
Other 559 564 611
Southern Power | Other adjustments      
Disaggregation of Revenue [Line Items]      
Other     0
Southern Company Gas      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 4,598 5,905 6,293
Total operating revenues 4,702 5,962 4,380
Southern Company Gas | Retail electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | Natural gas distribution revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 4,039 5,218 3,625
Southern Company Gas | Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,981 2,843 1,799
Southern Company Gas | Commercial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 505 763 470
Southern Company Gas | Transportation      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,184 1,186 1,038
Southern Company Gas | Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 45 84 49
Southern Company Gas | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 324 342 269
Southern Company Gas | Wholesale electric revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | PPA energy revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | PPA capacity revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | Non-PPA revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 559 687 2,668
Southern Company Gas | Wholesale gas services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers     2,168
Southern Company Gas | Gas marketing services      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 528 636 464
Southern Company Gas | Other natural gas revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 31 51 36
Southern Company Gas | Other revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Southern Company Gas | Other revenue sources      
Disaggregation of Revenue [Line Items]      
Other $ 104 $ 57 1,786
Southern Company Gas | Other adjustments      
Disaggregation of Revenue [Line Items]      
Other     $ (3,699)