v3.26.1
Revenue from Contracts with Customers and Lease Income - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 6,722 $ 6,734 $ 14,765 $ 14,328
Total operating revenues 6,977 6,973 15,374 14,748
Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2,007 2,021 4,010 4,087
Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,757 1,716 3,419 3,327
Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,021 1,015 1,962 1,930
Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 29 29 61 61
Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 4,814 4,781 9,452 9,405
Natural gas distribution revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 873 886 2,763 2,464
Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 353 394 1,380 1,239
Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 89 94 342 292
Transportation        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 358 331 798 737
Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 6 7 30 26
Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 67 60 213 170
Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 510 524 1,246 1,158
PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 301 310 796 723
PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 145 154 294 299
Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 64 60 156 136
Other natural gas revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 75 86 359 347
Gas marketing services        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 73 81 355 337
Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2 5 4 10
Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 450 457 945 954
Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues 255 239 609 420
ALABAMA POWER CO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,847 1,853 3,776 3,768
Total operating revenues 1,963 1,968 4,055 3,980
ALABAMA POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 720 725 1,493 1,531
ALABAMA POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 501 504 978 986
ALABAMA POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 441 432 855 822
ALABAMA POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3 2 6 4
ALABAMA POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,665 1,663 3,332 3,343
ALABAMA POWER CO | Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 120 123 304 275
ALABAMA POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 47 58 93 112
ALABAMA POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 18 29 36 57
ALABAMA POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 55 36 175 106
ALABAMA POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 62 67 140 150
ALABAMA POWER CO | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues 116 115 279 212
GEORGIA POWER CO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3,172 3,166 6,278 6,239
Total operating revenues 3,133 3,110 6,276 6,148
GEORGIA POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,208 1,217 2,358 2,403
GEORGIA POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,166 1,127 2,269 2,181
GEORGIA POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 471 496 909 940
GEORGIA POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 24 25 50 52
GEORGIA POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2,869 2,865 5,586 5,576
GEORGIA POWER CO | Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 91 95 243 227
GEORGIA POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 40 50 104 134
GEORGIA POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 32 35 76 74
GEORGIA POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 19 10 63 19
GEORGIA POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 212 206 449 436
GEORGIA POWER CO | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues (39) (56) (2) (91)
MISSISSIPPI POWER CO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 404 381 867 788
Total operating revenues 403 400 875 821
MISSISSIPPI POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 79 79 159 153
MISSISSIPPI POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 90 85 172 160
MISSISSIPPI POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 109 87 198 168
MISSISSIPPI POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2 2 5 5
MISSISSIPPI POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 280 253 534 486
MISSISSIPPI POWER CO | Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 113 119 307 272
MISSISSIPPI POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 8 2 11 5
MISSISSIPPI POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 25 17 46 34
MISSISSIPPI POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 80 100 250 233
MISSISSIPPI POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 11 9 26 30
MISSISSIPPI POWER CO | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues (1) 19 8 33
SOUTHERN POWER CO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 354 362 878 795
Total operating revenues 535 546 1,216 1,113
SOUTHERN POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 0 0 0 0
SOUTHERN POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 0 0 0 0
SOUTHERN POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 0 0 0 0
SOUTHERN POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 0 0 0 0
SOUTHERN POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 0 0 0 0
SOUTHERN POWER CO | Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 350 354 870 781
SOUTHERN POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 218 210 610 491
SOUTHERN POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 89 85 172 169
SOUTHERN POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 43 59 88 121
SOUTHERN POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 4 8 8 14
SOUTHERN POWER CO | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues 181 184 338 318
SOUTHERN Co GAS        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 948 972 3,122 2,811
Total operating revenues 966 979 3,157 2,818
SOUTHERN Co GAS | Natural gas distribution revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 873 886 2,763 2,464
SOUTHERN Co GAS | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 353 394 1,380 1,239
SOUTHERN Co GAS | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 89 94 342 292
SOUTHERN Co GAS | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 358 331 798 737
SOUTHERN Co GAS | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 6 7 30 26
SOUTHERN Co GAS | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 67 60 213 170
SOUTHERN Co GAS | Other natural gas revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 75 86 359 347
SOUTHERN Co GAS | Gas marketing services        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 73 81 355 337
SOUTHERN Co GAS | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2 5 4 10
SOUTHERN Co GAS | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 0 0 0 0
SOUTHERN Co GAS | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues $ 18 $ 7 $ 35 $ 7