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Segment and Related Information - Schedule of Gas Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | $ 7,823 |  |  | $ 7,274 |  |  | $ 22,572 | $ 20,383 |
Other segment items | 3,564 |  |  | 3,491 |  |  | 11,377 | 10,146 |
Depreciation and amortization | 1,422 |  |  | 1,210 |  |  | 4,030 | 3,537 |
Earnings from equity method investments | 33 |  |  | 31 |  |  | 76 | 107 |
Interest expense(e) | 755 |  |  | 692 |  |  | 2,343 | 2,050 |
Income taxes (benefit) | 404 |  |  | 377 |  |  | 973 | 890 |
Consolidated Net Income Attributable to Southern Company | 1,711 |  |  | 1,535 |  |  | 3,925 | 3,867 |
Total assets | 153,248 |  |  |  |  |  | 153,248 |  | $ 145,180
SOUTHERN Co GAS |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | 734 |  |  | 682 |  |  | 3,552 | 3,220 |
Other segment items | 464 |  |  | 421 |  |  | 2,133 | 1,866 |
Depreciation and amortization | 176 |  |  | 162 |  |  | 517 | 475 |
Earnings from equity method investments | 31 |  |  | 34 |  |  | 93 | 110 |
Interest expense(e) | 94 |  |  | 84 |  |  | 277 | 250 |
Income taxes (benefit) | 6 |  |  | 11 |  |  | 169 | 184 |
Consolidated Net Income Attributable to Southern Company | 25 | $ 106 | $ 418 | 38 | $ 108 | $ 409 | 549 | 555 |
Total assets | 26,926 |  |  |  |  |  | 26,926 |  | 26,177
Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | 7,662 |  |  | 7,104 |  |  | 22,040 | 19,913 |
Other segment items | 3,396 |  |  | 3,329 |  |  | 10,886 | 9,700 |
Depreciation and amortization | 1,404 |  |  | 1,193 |  |  | 3,978 | 3,484 |
Earnings from equity method investments | 33 |  |  | 36 |  |  | 97 | 114 |
Interest expense(e) | 458 |  |  | 433 |  |  | 1,343 | 1,293 |
Income taxes (benefit) | 489 |  |  | 447 |  |  | 1,246 | 1,101 |
Consolidated Net Income Attributable to Southern Company | 1,948 |  |  | 1,738 |  |  | 4,684 | 4,449 |
Total assets | 151,312 |  |  |  |  |  | 151,312 |  | 143,382
Operating Segments | SOUTHERN Co GAS |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | 734 |  |  | 677 |  |  | 3,549 | 3,210 |
Other segment items | 460 |  |  | 417 |  |  | 2,129 | 1,859 |
Depreciation and amortization | 175 |  |  | 161 |  |  | 516 | 474 |
Earnings from equity method investments | 31 |  |  | 34 |  |  | 93 | 110 |
Interest expense(e) | 100 |  |  | 84 |  |  | 282 | 257 |
Income taxes (benefit) | (5) |  |  | 6 |  |  | 159 | 178 |
Consolidated Net Income Attributable to Southern Company | 35 |  |  | 43 |  |  | 556 | 552 |
Total assets | 28,335 |  |  |  |  |  | 28,335 |  | 27,336
Operating Segments | Gas distribution operations | SOUTHERN Co GAS |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | 668 |  |  | 616 |  |  | 3,122 | 2,828 |
Other segment items | 409 |  |  | 366 |  |  | 1,842 | 1,612 |
Depreciation and amortization | 171 |  |  | 156 |  |  | 502 | 459 |
Earnings from equity method investments | 0 |  |  | 0 |  |  | 0 | 0 |
Interest expense(e) | 89 |  |  | 75 |  |  | 252 | 229 |
Income taxes (benefit) | (13) |  |  | (2) |  |  | 109 | 125 |
Consolidated Net Income Attributable to Southern Company | 12 |  |  | 21 |  |  | 417 | 403 |
Total assets | 25,200 |  |  |  |  |  | 25,200 |  | 24,067
Operating Segments | Gas Pipeline Investments | SOUTHERN Co GAS |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | 8 |  |  | 8 |  |  | 24 | 24 |
Other segment items | 1 |  |  | 1 |  |  | 3 | 3 |
Depreciation and amortization | 1 |  |  | 1 |  |  | 4 | 4 |
Earnings from equity method investments | 31 |  |  | 34 |  |  | 93 | 110 |
Interest expense(e) | 10 |  |  | 8 |  |  | 28 | 26 |
Income taxes (benefit) | 7 |  |  | 8 |  |  | 20 | 24 |
Consolidated Net Income Attributable to Southern Company | 20 |  |  | 24 |  |  | 62 | 77 |
Total assets | 1,468 |  |  |  |  |  | 1,468 |  | 1,573
Operating Segments | Gas marketing services | SOUTHERN Co GAS |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | 58 |  |  | 53 |  |  | 403 | 358 |
Other segment items | 50 |  |  | 50 |  |  | 284 | 244 |
Depreciation and amortization | 3 |  |  | 4 |  |  | 10 | 11 |
Earnings from equity method investments | 0 |  |  | 0 |  |  | 0 | 0 |
Interest expense(e) | 1 |  |  | 1 |  |  | 2 | 2 |
Income taxes (benefit) | 1 |  |  | 0 |  |  | 30 | 29 |
Consolidated Net Income Attributable to Southern Company | 3 |  |  | (2) |  |  | 77 | 72 |
Total assets | 1,667 |  |  |  |  |  | 1,667 |  | 1,696
Operating Segments | All Other | SOUTHERN Co GAS |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Consolidated Net Income Attributable to Southern Company |  |  |  | (5) |  |  |  |  |
All Other |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | 202 |  |  | 215 |  |  | 656 | 598 |
Other segment items | 209 |  |  | 203 |  |  | 611 | 548 |
Depreciation and amortization | 18 |  |  | 17 |  |  | 52 | 53 |
Earnings from equity method investments | 0 |  |  | (5) |  |  | (21) | (8) |
Interest expense(e) | 297 |  |  | 261 |  |  | 1,000 | 769 |
Income taxes (benefit) | (85) |  |  | (70) |  |  | (273) | (211) |
Consolidated Net Income Attributable to Southern Company | (237) |  |  | (201) |  |  | (755) | (569) |
Total assets | 2,397 |  |  |  |  |  | 2,397 |  | 2,371
All Other | SOUTHERN Co GAS |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | 1 |  |  | 6 |  |  | 11 | 19 |
Other segment items | 5 |  |  | 5 |  |  | 12 | 16 |
Depreciation and amortization | 1 |  |  | 1 |  |  | 1 | 1 |
Earnings from equity method investments | 0 |  |  | 0 |  |  | 0 | 0 |
Interest expense(e) | (6) |  |  | 0 |  |  | (5) | (7) |
Income taxes (benefit) | 11 |  |  | 5 |  |  | 10 | 6 |
Consolidated Net Income Attributable to Southern Company | (10) |  |  |  |  |  | (7) | 3 |
Total assets | 10,845 |  |  |  |  |  | 10,845 |  | 10,047
Eliminations |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | (41) |  |  | (45) |  |  | (124) | (128) |
Other segment items | (41) |  |  | (41) |  |  | (120) | (102) |
Depreciation and amortization | 0 |  |  | 0 |  |  | 0 | 0 |
Earnings from equity method investments | 0 |  |  | 0 |  |  | 0 | 1 |
Interest expense(e) | 0 |  |  | (2) |  |  | 0 | (12) |
Income taxes (benefit) | 0 |  |  | 0 |  |  | 0 | 0 |
Consolidated Net Income Attributable to Southern Company | 0 |  |  | (2) |  |  | (4) | (13) |
Total assets | (461) |  |  |  |  |  | (461) |  | (573)
Eliminations | SOUTHERN Co GAS |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues | (1) |  |  | (1) |  |  | (8) | (9) |
Other segment items | (1) |  |  | (1) |  |  | (8) | (9) |
Depreciation and amortization | 0 |  |  | 0 |  |  | 0 | 0 |
Earnings from equity method investments | 0 |  |  | 0 |  |  | 0 | 0 |
Interest expense(e) | 0 |  |  | 0 |  |  | 0 | 0 |
Income taxes (benefit) | 0 |  |  | 0 |  |  | 0 | 0 |
Consolidated Net Income Attributable to Southern Company | 0 |  |  | $ 0 |  |  | 0 | $ 0 |
Total assets | $ (12,254) |  |  |  |  |  | $ (12,254) |  | $ (11,206)

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