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Revenue from Contracts with Customers and Lease Income - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers $ 8,040 $ 7,591
Total operating revenues 8,397 7,775
Residential    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 2,003 2,065
Commercial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,663 1,612
Industrial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 942 915
Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 31 31
Retail electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 4,639 4,623
Natural gas distribution revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,890 1,580
Residential    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,028 845
Commercial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 253 199
Transportation    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 440 406
Industrial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 24 18
Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 145 112
Wholesale electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 734 635
PPA energy revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 496 415
PPA capacity revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 149 149
Non-PPA revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 89 71
Other natural gas revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 284 260
Gas marketing services    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 281 256
Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 3 4
Other revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 493 493
Other revenue sources    
Disaggregation of Revenue [Line Items]    
Other revenues 357 184
ALABAMA POWER CO    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,928 1,914
Total operating revenues 2,092 2,012
ALABAMA POWER CO | Residential    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 773 805
ALABAMA POWER CO | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 477 482
ALABAMA POWER CO | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 414 390
ALABAMA POWER CO | Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 3 3
ALABAMA POWER CO | Retail electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,667 1,680
ALABAMA POWER CO | Wholesale electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 183 151
ALABAMA POWER CO | PPA energy revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 46 54
ALABAMA POWER CO | PPA capacity revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 18 28
ALABAMA POWER CO | Non-PPA revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 119 69
ALABAMA POWER CO | Other revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 78 83
ALABAMA POWER CO | Other revenue sources    
Disaggregation of Revenue [Line Items]    
Other revenues 164 98
GEORGIA POWER CO    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 3,105 3,073
Total operating revenues 3,142 3,037
GEORGIA POWER CO | Residential    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,150 1,186
GEORGIA POWER CO | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,104 1,055
GEORGIA POWER CO | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 438 444
GEORGIA POWER CO | Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 25 26
GEORGIA POWER CO | Retail electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 2,717 2,711
GEORGIA POWER CO | Wholesale electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 152 132
GEORGIA POWER CO | PPA energy revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 64 84
GEORGIA POWER CO | PPA capacity revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 44 39
GEORGIA POWER CO | Non-PPA revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 44 9
GEORGIA POWER CO | Other revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 236 230
GEORGIA POWER CO | Other revenue sources    
Disaggregation of Revenue [Line Items]    
Other revenues 37 (36)
MISSISSIPPI POWER CO    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 464 406
Total operating revenues 472 420
MISSISSIPPI POWER CO | Residential    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 80 74
MISSISSIPPI POWER CO | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 82 75
MISSISSIPPI POWER CO | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 90 81
MISSISSIPPI POWER CO | Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 3 2
MISSISSIPPI POWER CO | Retail electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 255 232
MISSISSIPPI POWER CO | Wholesale electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 194 154
MISSISSIPPI POWER CO | PPA energy revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 4 3
MISSISSIPPI POWER CO | PPA capacity revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 21 17
MISSISSIPPI POWER CO | Non-PPA revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 169 134
MISSISSIPPI POWER CO | Other revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 15 20
MISSISSIPPI POWER CO | Other revenue sources    
Disaggregation of Revenue [Line Items]    
Other revenues 8 14
SOUTHERN POWER CO    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 523 432
Total operating revenues 681 567
SOUTHERN POWER CO | Residential    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 0 0
SOUTHERN POWER CO | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 0 0
SOUTHERN POWER CO | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 0 0
SOUTHERN POWER CO | Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 0 0
SOUTHERN POWER CO | Retail electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 0 0
SOUTHERN POWER CO | Wholesale electric revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 519 428
SOUTHERN POWER CO | PPA energy revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 392 284
SOUTHERN POWER CO | PPA capacity revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 83 82
SOUTHERN POWER CO | Non-PPA revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 44 62
SOUTHERN POWER CO | Other revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 4 4
SOUTHERN POWER CO | Other revenue sources    
Disaggregation of Revenue [Line Items]    
Other revenues 158 135
SOUTHERN Co GAS    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 2,174 1,840
Total operating revenues 2,191 1,839
SOUTHERN Co GAS | Natural gas distribution revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,890 1,580
SOUTHERN Co GAS | Residential    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,028 845
SOUTHERN Co GAS | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 253 199
SOUTHERN Co GAS | Transportation    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 440 406
SOUTHERN Co GAS | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 24 18
SOUTHERN Co GAS | Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 145 112
SOUTHERN Co GAS | Other natural gas revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 284 260
SOUTHERN Co GAS | Gas marketing services    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 281 256
SOUTHERN Co GAS | Other    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 3 4
SOUTHERN Co GAS | Other revenues    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 0 0
SOUTHERN Co GAS | Other revenue sources    
Disaggregation of Revenue [Line Items]    
Other revenues $ 17 $ (1)