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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | $ 6,347 | $ 5,532 | $ 13,028 | $ 11,777
Total operating revenues | 6,463 | 5,748 | 13,109 | 12,228
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,049 | 1,647 | 3,900 | 3,174
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,613 | 1,370 | 3,084 | 2,619
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 962 | 864 | 1,834 | 1,653
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 30 | 27 | 60 | 54
Retail electric revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 4,654 | 3,908 | 8,878 | 7,500
Natural gas distribution revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 728 | 753 | 2,140 | 2,340
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 287 | 330 | 1,032 | 1,226
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 69 | 82 | 245 | 314
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 304 | 284 | 666 | 603
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 5 | 6 | 21 | 29
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 63 | 51 | 176 | 168
Wholesale electric revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 472 | 463 | 953 | 973
PPA energy revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 265 | 253 | 537 | 534
PPA capacity revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 153 | 149 | 304 | 341
Non-PPA revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 54 | 61 | 112 | 98
Other natural gas revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 74 | 81 | 311 | 324
Gas marketing services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 68 | 73 | 300 | 304
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 6 | 8 | 11 | 20
Other revenue sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 116 | 216 | 81 | 451
Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 419 | 327 | 746 | 640
ALABAMA POWER CO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,859 | 1,702 | 3,678 | 3,404
Total operating revenues | 1,873 | 1,689 | 3,664 | 3,336
ALABAMA POWER CO | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 736 | 648 | 1,501 | 1,308
ALABAMA POWER CO | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 508 | 465 | 976 | 894
ALABAMA POWER CO | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 445 | 429 | 855 | 827
ALABAMA POWER CO | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 3 | 3 | 6 | 6
ALABAMA POWER CO | Retail electric revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,692 | 1,545 | 3,338 | 3,035
ALABAMA POWER CO | Wholesale electric revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 105 | 114 | 226 | 266
ALABAMA POWER CO | PPA energy revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 55 | 58 | 112 | 129
ALABAMA POWER CO | PPA capacity revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 23 | 44 | 46 | 105
ALABAMA POWER CO | Non-PPA revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 27 | 12 | 68 | 32
ALABAMA POWER CO | Other revenue sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 14 | (13) | (14) | (68)
ALABAMA POWER CO | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 62 | 43 | 114 | 103
GEORGIA POWER CO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,959 | 2,321 | 5,517 | 4,368
Total operating revenues | 2,875 | 2,391 | 5,273 | 4,567
GEORGIA POWER CO | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,236 | 928 | 2,252 | 1,730
GEORGIA POWER CO | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,023 | 830 | 1,955 | 1,582
GEORGIA POWER CO | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 434 | 353 | 817 | 666
GEORGIA POWER CO | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 25 | 22 | 50 | 44
GEORGIA POWER CO | Retail electric revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,718 | 2,133 | 5,074 | 4,022
GEORGIA POWER CO | Wholesale electric revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 56 | 43 | 106 | 70
GEORGIA POWER CO | PPA energy revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 22 | 24 | 40 | 35
GEORGIA POWER CO | PPA capacity revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 32 | 13 | 64 | 25
GEORGIA POWER CO | Non-PPA revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2 | 6 | 2 | 10
GEORGIA POWER CO | Other revenue sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | (84) | 70 | (244) | 199
GEORGIA POWER CO | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 185 | 145 | 337 | 276
MISSISSIPPI POWER CO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 365 | 314 | 708 | 682
Total operating revenues | 364 | 311 | 706 | 702
MISSISSIPPI POWER CO | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 77 | 71 | 147 | 136
MISSISSIPPI POWER CO | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 82 | 75 | 153 | 143
MISSISSIPPI POWER CO | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 83 | 82 | 162 | 160
MISSISSIPPI POWER CO | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2 | 2 | 4 | 4
MISSISSIPPI POWER CO | Retail electric revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 244 | 230 | 466 | 443
MISSISSIPPI POWER CO | Wholesale electric revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 111 | 74 | 220 | 217
MISSISSIPPI POWER CO | PPA energy revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1 | 2 | 2 | 5
MISSISSIPPI POWER CO | PPA capacity revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 15 | 2 | 31 | 34
MISSISSIPPI POWER CO | Non-PPA revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 95 | 70 | 187 | 178
MISSISSIPPI POWER CO | Other revenue sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | (1) | (3) | (2) | 20
MISSISSIPPI POWER CO | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 10 | 10 | 22 | 22
SOUTHERN POWER CO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 352 | 365 | 721 | 769
Total operating revenues | 524 | 525 | 997 | 1,033
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 | 341 | 349 | 700 | 742
SOUTHERN POWER CO | PPA energy revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 192 | 175 | 394 | 376
SOUTHERN POWER CO | PPA capacity revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 99 | 91 | 196 | 179
SOUTHERN POWER CO | Non-PPA revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 50 | 83 | 110 | 187
SOUTHERN POWER CO | Other revenue sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 172 | 160 | 276 | 264
SOUTHERN POWER CO | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 11 | 16 | 21 | 27
SOUTHERN Co GAS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 802 | 834 | 2,451 | 2,664
Total operating revenues | 831 | 852 | 2,538 | 2,728
SOUTHERN Co GAS | Natural gas distribution revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 728 | 753 | 2,140 | 2,340
SOUTHERN Co GAS | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 287 | 330 | 1,032 | 1,226
SOUTHERN Co GAS | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 69 | 82 | 245 | 314
SOUTHERN Co GAS | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 304 | 284 | 666 | 603
SOUTHERN Co GAS | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 5 | 6 | 21 | 29
SOUTHERN Co GAS | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 63 | 51 | 176 | 168
SOUTHERN Co GAS | Other natural gas revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 74 | 81 | 311 | 324
SOUTHERN Co GAS | Gas marketing services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 68 | 73 | 300 | 304
SOUTHERN Co GAS | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 6 | 8 | 11 | 20
SOUTHERN Co GAS | Other revenue sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other revenues | 29 | 18 | 87 | 64
SOUTHERN Co GAS | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | $ 0 | $ 0 | $ 0 | $ 0

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