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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 26,764 | $ 24,828 | $ 25,941
Total operating revenues | 26,724 | 25,253 | 29,279
Retail electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 18,877 | 16,894 | 15,839
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 8,276 | 7,309 | 6,604
Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 6,585 | 5,860 | 5,369
Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,892 | 3,613 | 3,764
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 124 | 112 | 102
Natural gas distribution revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,815 | 4,039 | 5,218
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,753 | 1,981 | 2,843
Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 417 | 505 | 763
Transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,295 | 1,184 | 1,186
Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 34 | 45 | 84
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 316 | 324 | 342
Wholesale electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,926 | 1,981 | 3,120
PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,059 | 1,107 | 2,274
PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 641 | 624 | 596
Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 226 | 250 | 250
Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 525 | 559 | 687
Gas marketing services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 507 | 528 | 636
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 18 | 31 | 51
Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,621 | 1,355 | 1,077
Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | (40) | 425 | 3,338
Alabama Power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 7,623 | 7,233 | 6,921
Total operating revenues | 7,554 | 7,050 | 7,817
Alabama Power | Retail electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 6,930 | 6,565 | 5,844
Alabama Power | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,133 | 2,904 | 2,638
Alabama Power | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,042 | 1,928 | 1,685
Alabama Power | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,742 | 1,721 | 1,507
Alabama Power | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 13 | 12 | 14
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 | 453 | 455 | 883
Alabama Power | PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 206 | 234 | 489
Alabama Power | PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 108 | 156 | 194
Alabama Power | Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 139 | 65 | 200
Alabama Power | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 | 0
Alabama Power | Gas marketing services |  |  |
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 | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 240 | 213 | 194
Alabama Power | Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | (69) | (183) | 896
Georgia Power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 11,920 | 10,129 | 9,702
Total operating revenues | 11,331 | 10,118 | 11,584
Georgia Power | Retail electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 10,964 | 9,378 | 9,049
Georgia Power | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 4,835 | 4,105 | 3,664
Georgia Power | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 4,219 | 3,624 | 3,385
Georgia Power | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,808 | 1,558 | 1,921
Georgia Power | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 102 | 91 | 79
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 | 235 | 173 | 207
Georgia Power | PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 94 | 87 | 130
Georgia Power | PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 136 | 51 | 47
Georgia Power | Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 5 | 35 | 30
Georgia Power | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 | 0
Georgia Power | Gas marketing services |  |  |
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 | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 721 | 578 | 446
Georgia Power | Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | (589) | (11) | 1,882
Mississippi Power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,477 | 1,462 | 1,703
Total operating revenues | 1,463 | 1,474 | 1,694
Mississippi Power | Retail electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 983 | 951 | 946
Mississippi Power | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 308 | 300 | 302
Mississippi Power | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 324 | 308 | 299
Mississippi Power | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 342 | 334 | 336
Mississippi Power | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 9 | 9 | 9
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 | 442 | 472 | 710
Mississippi Power | PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 4 | 20 | 16
Mississippi Power | PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 63 | 45 | 4
Mississippi Power | Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 375 | 407 | 690
Mississippi Power | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 | 0
Mississippi Power | Gas marketing services |  |  |
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 | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 52 | 39 | 47
Mississippi Power | Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | (14) | 12 | (9)
Southern Power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,445 | 1,630 | 2,805
Total operating revenues | 2,014 | 2,189 | 3,369
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 | 1,408 | 1,575 | 2,769
Southern Power | PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 778 | 790 | 1,673
Southern Power | PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 400 | 376 | 356
Southern Power | Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 230 | 409 | 740
Southern Power | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 | 0
Southern Power | Gas marketing services |  |  |
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 | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 37 | 55 | 36
Southern Power | Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 569 | 559 | 564
Southern Company Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 4,340 | 4,598 | 5,905
Total operating revenues | 4,456 | 4,702 | 5,962
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 | 3,815 | 4,039 | 5,218
Southern Company Gas | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,753 | 1,981 | 2,843
Southern Company Gas | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 417 | 505 | 763
Southern Company Gas | Transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,295 | 1,184 | 1,186
Southern Company Gas | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 34 | 45 | 84
Southern Company Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 316 | 324 | 342
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 | 525 | 559 | 687
Southern Company Gas | Gas marketing services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 507 | 528 | 636
Southern Company Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 18 | 31 | 51
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 | $ 116 | $ 104 | $ 57

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