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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregate Revenue Sources (Details) - USD ($) $ in Millions | 12 Months Ended
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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)

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