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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregate Revenue Sources (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 23,463 | $ 21,097 | $ 22,596
Total operating revenues | 23,113 | 20,375 | 21,419
Retail electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 14,244 | 13,677 | 14,445
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 6,207 | 6,113 | 6,164
Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 4,877 | 4,699 | 5,065
Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,067 | 2,775 | 3,126
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 93 | 90 | 90
Natural gas distribution revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,625 | 2,888 | 2,989
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,799 | 1,338 | 1,413
Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 470 | 340 | 389
Transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,038 | 971 | 907
Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 49 | 30 | 35
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 269 | 209 | 245
Wholesale electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,851 | 1,399 | 1,518
PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,122 | 735 | 833
PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 493 | 454 | 453
Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 236 | 210 | 232
Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,668 | 2,151 | 2,609
Gas pipeline investments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  |  | 32
Wholesale gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,168 | 1,727 | 2,095
Gas marketing services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 464 | 391 | 440
Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 36 | 33 | 42
Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,075 | 982 | 1,035
Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 3,349 | 3,764 | 4,266
Other adjustments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | (3,699) | (4,486) | (5,443)
Alabama Power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 6,141 | 5,646 | 6,152
Total operating revenues | 6,413 | 5,830 | 6,125
Alabama Power | Retail electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 5,470 | 5,203 | 5,671
Alabama Power | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,467 | 2,377 | 2,509
Alabama Power | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,600 | 1,512 | 1,677
Alabama Power | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,386 | 1,293 | 1,460
Alabama Power | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 17 | 21 | 25
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 | 469 | 284 | 328
Alabama Power | PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 184 | 133 | 145
Alabama Power | PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 115 | 108 | 102
Alabama Power | Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 170 | 43 | 81
Alabama Power | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 | 0
Alabama Power | Gas pipeline investments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  |  | 0
Alabama Power | Wholesale gas services |  |  |
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 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 | 202 | 159 | 153
Alabama Power | Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 272 | 184 | (27)
Alabama Power | Other adjustments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 0 | 0 | 0
Georgia Power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 8,563 | 8,215 | 8,418
Total operating revenues | 9,260 | 8,309 | 8,408
Georgia Power | Retail electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 7,940 | 7,666 | 7,888
Georgia Power | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,471 | 3,476 | 3,377
Georgia Power | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,010 | 2,933 | 3,097
Georgia Power | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,391 | 1,197 | 1,360
Georgia Power | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 68 | 60 | 54
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 | 171 | 102 | 123
Georgia Power | PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 95 | 42 | 60
Georgia Power | PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 55 | 50 | 54
Georgia Power | Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 21 | 10 | 9
Georgia Power | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 | 0
Georgia Power | Gas pipeline investments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  |  | 0
Georgia Power | Wholesale gas services |  |  |
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 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 | 452 | 447 | 407
Georgia Power | Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 697 | 94 | (10)
Georgia Power | Other adjustments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 0 | 0 | 0
Mississippi Power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,282 | 1,157 | 1,271
Total operating revenues | 1,322 | 1,172 | 1,264
Mississippi Power | Retail electric revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 834 | 808 | 886
Mississippi Power | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 269 | 260 | 278
Mississippi Power | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 267 | 254 | 291
Mississippi Power | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 290 | 285 | 306
Mississippi Power | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 8 | 9 | 11
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 | 417 | 323 | 366
Mississippi Power | PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 11 | 9 | 11
Mississippi Power | PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 5 | 3 | 3
Mississippi Power | Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 401 | 311 | 352
Mississippi Power | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 | 0
Mississippi Power | Gas pipeline investments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  |  | 0
Mississippi Power | Wholesale gas services |  |  |
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 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 | 31 | 26 | 19
Mississippi Power | Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 40 | 15 | (7)
Mississippi Power | Other adjustments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 0 | 0 | 0
Southern Power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,605 | 1,119 | 1,220
Total operating revenues | 2,216 | 1,733 | 1,938
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 | 1,105 | 1,208
Southern Power | PPA energy revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 854 | 570 | 648
Southern Power | PPA capacity revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 323 | 296 | 322
Southern Power | Non-PPA revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 398 | 239 | 238
Southern Power | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 | 0
Southern Power | Gas pipeline investments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  |  | 0
Southern Power | Wholesale gas services |  |  |
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 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 | 30 | 14 | 12
Southern Power | Other revenue sources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 611 | 614 | 718
Southern Power | Other adjustments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | 0 | 0 | 0
Southern Company Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 6,293 | 5,039 | 5,598
Total operating revenues | 4,380 | 3,434 | 3,792
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 | 3,625 | 2,888 | 2,989
Southern Company Gas | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,799 | 1,338 | 1,413
Southern Company Gas | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 470 | 340 | 389
Southern Company Gas | Transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,038 | 971 | 907
Southern Company Gas | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 49 | 30 | 35
Southern Company Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 269 | 209 | 245
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 | 2,668 | 2,151 | 2,609
Southern Company Gas | Gas pipeline investments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  |  | 32
Southern Company Gas | Wholesale gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,168 | 1,727 | 2,095
Southern Company Gas | Gas marketing services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 464 | 391 | 440
Southern Company Gas | Other natural gas revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 36 | 33 | 42
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 | 1,786 | 2,881 | 3,637
Southern Company Gas | Other adjustments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other | $ (3,699) | $ (4,486) | $ (5,443)

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