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Revenue from Contracts with Customers and Lease Income - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 7,822 $ 7,481 $ 22,142 $ 20,513
Total operating revenues 7,823 7,274 22,572 20,383
Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2,737 2,651 6,822 6,551
Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2,074 1,991 5,400 5,075
Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,195 1,184 3,127 3,019
Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 32 33 94 94
Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 6,038 5,859 15,443 14,739
Natural gas distribution revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 668 610 3,132 2,749
Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 236 212 1,475 1,244
Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 65 55 357 300
Transportation        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 316 294 1,053 959
Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 4 4 30 25
Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 47 45 217 221
Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 659 557 1,810 1,512
PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 373 300 1,097 838
PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 180 190 478 495
Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 106 67 235 179
Other natural gas revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 57 57 405 368
Gas marketing services        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 56 51 394 352
Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1 6 11 16
Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 400 398 1,352 1,145
Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues 1 (207) 430 (130)
ALABAMA POWER CO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2,294 2,244 6,053 5,926
Total operating revenues 2,318 2,138 6,298 5,803
ALABAMA POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 982 975 2,512 2,477
ALABAMA POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 614 607 1,599 1,583
ALABAMA POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 481 483 1,304 1,338
ALABAMA POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3 3 8 9
ALABAMA POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2,080 2,068 5,423 5,407
ALABAMA POWER CO | Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 155 116 421 345
ALABAMA POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 81 58 193 171
ALABAMA POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 32 24 89 71
ALABAMA POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 42 34 139 103
ALABAMA POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 59 60 209 174
ALABAMA POWER CO | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues 24 (106) 245 (123)
GEORGIA POWER CO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3,970 3,740 10,209 9,259
Total operating revenues 3,770 3,472 9,918 8,745
GEORGIA POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,653 1,580 4,056 3,832
GEORGIA POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,358 1,288 3,539 3,243
GEORGIA POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 620 606 1,560 1,424
GEORGIA POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 27 28 79 78
GEORGIA POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3,658 3,502 9,234 8,577
GEORGIA POWER CO | Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 121 68 348 175
GEORGIA POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 58 26 192 66
GEORGIA POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 40 42 113 106
GEORGIA POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 23 0 43 3
GEORGIA POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 191 170 627 507
GEORGIA POWER CO | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues (200) (268) (291) (514)
MISSISSIPPI POWER CO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 481 424 1,270 1,131
Total operating revenues 480 412 1,301 1,118
MISSISSIPPI POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 102 96 254 242
MISSISSIPPI POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 102 96 262 249
MISSISSIPPI POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 94 95 263 257
MISSISSIPPI POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2 2 7 7
MISSISSIPPI POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 300 289 786 755
MISSISSIPPI POWER CO | Wholesale electric revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 169 122 442 342
MISSISSIPPI POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3 1 8 3
MISSISSIPPI POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 16 15 50 47
MISSISSIPPI POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 150 106 384 292
MISSISSIPPI POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 12 13 42 34
MISSISSIPPI POWER CO | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues (1) (12) 31 (13)
SOUTHERN POWER CO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 417 423 1,212 1,143
Total operating revenues 613 600 1,726 1,597
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 414 414 1,195 1,112
SOUTHERN POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 246 222 739 616
SOUTHERN POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 109 125 276 320
SOUTHERN POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 59 67 180 176
SOUTHERN POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3 9 17 31
SOUTHERN POWER CO | Other revenue sources        
Disaggregation of Revenue [Line Items]        
Other revenues 196 177 514 454
SOUTHERN Co GAS        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 725 667 3,537 3,117
Total operating revenues 734 682 3,552 3,220
SOUTHERN Co GAS | Natural gas distribution revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 668 610 3,132 2,749
SOUTHERN Co GAS | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 236 212 1,475 1,244
SOUTHERN Co GAS | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 65 55 357 300
SOUTHERN Co GAS | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 316 294 1,053 959
SOUTHERN Co GAS | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 4 4 30 25
SOUTHERN Co GAS | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 47 45 217 221
SOUTHERN Co GAS | Other natural gas revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 57 57 405 368
SOUTHERN Co GAS | Gas marketing services        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 56 51 394 352
SOUTHERN Co GAS | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1 6 11 16
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 $ 9 $ 15 $ 15 $ 103