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SEGMENT AND RELATED INFORMATION - Financial Data for Business Segments (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2024 MW | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | $ 26,724 | $ 25,253 | $ 29,279
Other segment items |  |  |  |  |  |  | 13,995 | 13,954 | 19,426
Depreciation and amortization |  |  |  |  |  |  | 4,755 | 4,525 | 3,663
Earnings from equity method investments |  |  |  |  |  |  | 139 | 144 | 151
Interest expense |  |  |  |  |  |  | 2,743 | 2,446 | 2,022
Income taxes (benefit) |  |  |  |  |  |  | 969 | 496 | 795
Segment net income (loss) |  |  |  |  |  |  | 4,401 | 3,976 | 3,524
Goodwill |  |  |  | $ 5,161 |  | $ 5,161 | 5,161 | 5,161 | 5,161
Total assets |  |  |  | 139,331 |  | 134,891 | 145,180 | 139,331 | 134,891
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Estimated loss on Plant Vogtle Units 3 and 4 |  |  |  |  |  |  | (21) | (68) | 183
Southern Company Gas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 4,456 | 4,702 | 5,962
Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 26,059 | 24,700 | 28,835
Other segment items |  |  |  |  |  |  | 13,342 | 13,405 | 18,793
Depreciation and amortization |  |  |  |  |  |  | 4,684 | 4,447 | 3,588
Earnings from equity method investments |  |  |  |  |  |  | 154 | 139 | 148
Interest expense |  |  |  |  |  |  | 1,713 | 1,584 | 1,330
Income taxes (benefit) |  |  |  |  |  |  | 1,261 | 794 | 1,028
Segment net income (loss) |  |  |  |  |  |  | 5,213 | 4,609 | 4,244
Goodwill |  |  |  | 5,017 |  | 5,017 | 5,017 | 5,017 | 5,017
Total assets |  |  |  | 137,728 |  | 132,904 | 143,382 | 137,728 | 132,904
Operating Segments | Electric Utilities |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 21,603 | 19,998 | 22,873
Other segment items |  |  |  |  |  |  | 10,729 | 10,281 | 14,257
Depreciation and amortization |  |  |  |  |  |  | 4,034 | 3,865 | 3,029
Earnings from equity method investments |  |  |  |  |  |  | 8 | (1) | 0
Interest expense |  |  |  |  |  |  | 1,372 | 1,274 | 1,067
Income taxes (benefit) |  |  |  |  |  |  | 1,003 | 583 | 848
Segment net income (loss) |  |  |  |  |  |  | 4,473 | 3,994 | 3,672
Goodwill |  |  |  | 2 |  | 2 | 2 | 2 | 2
Total assets |  |  |  | 112,645 |  | 108,283 | 117,205 | 112,645 | 108,283
Operating Segments | Traditional Electric Operating Companies |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 19,977 | 18,358 | 20,408
Other segment items |  |  |  |  |  |  | 10,057 | 9,643 | 12,820
Depreciation and amortization |  |  |  |  |  |  | 3,512 | 3,361 | 2,513
Earnings from equity method investments |  |  |  |  |  |  | 8 | (1) | 0
Interest expense |  |  |  |  |  |  | 1,255 | 1,145 | 929
Income taxes (benefit) |  |  |  |  |  |  | 1,016 | 571 | 828
Segment net income (loss) |  |  |  |  |  |  | 4,145 | 3,637 | 3,318
Goodwill |  |  |  | 0 |  | 0 | 0 | 0 | 0
Total assets |  |  |  | 100,429 |  | 95,861 | 105,577 | 100,429 | 95,861
Operating Segments | Southern Power |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 2,014 | 2,189 | 3,369
Other segment items |  |  |  |  |  |  | 1,060 | 1,187 | 2,341
Depreciation and amortization |  |  |  |  |  |  | 522 | 504 | 516
Earnings from equity method investments |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  | 117 | 129 | 138
Income taxes (benefit) |  |  |  |  |  |  | (13) | 12 | 20
Segment net income (loss) |  |  |  |  |  |  | 328 | 357 | 354
Goodwill |  |  |  | 2 |  | 2 | 2 | 2 | 2
Total assets |  |  |  | 12,761 |  | 13,081 | 12,653 | 12,761 | 13,081
Operating Segments | Southern Company Gas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 4,456 | 4,702 | 5,962
Other segment items |  |  |  |  |  |  | 2,613 | 3,124 | 4,536
Depreciation and amortization |  |  |  |  |  |  | 650 | 582 | 559
Earnings from equity method investments |  |  |  |  |  |  | 146 | 140 | 148
Interest expense |  |  |  |  |  |  | 341 | 310 | 263
Income taxes (benefit) |  |  |  |  |  |  | 258 | 211 | 180
Segment net income (loss) |  |  |  |  |  |  | 740 | 615 | 572
Goodwill |  |  |  | 5,015 |  | 5,015 | 5,015 | 5,015 | 5,015
Total assets |  |  |  | 25,083 |  | 24,621 | 26,177 | 25,083 | 24,621
Eliminations |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | (178) | (165) | (149)
Other segment items |  |  |  |  |  |  | (149) | (150) | (138)
Depreciation and amortization |  |  |  |  |  |  | 0 | 0 | 0
Earnings from equity method investments |  |  |  |  |  |  | 2 | 0 | 0
Interest expense |  |  |  |  |  |  | 0 | (17) | (2)
Income taxes (benefit) |  |  |  |  |  |  | 0 | 0 | 0
Segment net income (loss) |  |  |  |  |  |  | (27) | 2 | (9)
Goodwill |  |  |  | 0 |  | 0 | 0 | 0 | 0
Total assets |  |  |  | (843) |  | (678) | (573) | (843) | (678)
Eliminations | Electric Utilities |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | (388) | (549) | (904)
Other segment items |  |  |  |  |  |  | (388) | (549) | (904)
Depreciation and amortization |  |  |  |  |  |  | 0 | 0 | 0
Earnings from equity method investments |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  | 0 | 0 | 0
Income taxes (benefit) |  |  |  |  |  |  | 0 | 0 | 0
Segment net income (loss) |  |  |  |  |  |  | 0 | 0 | 0
Goodwill |  |  |  | 0 |  | 0 | 0 | 0 | 0
Total assets |  |  |  | (545) |  | (659) | (1,025) | (545) | (659)
All Other |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 843 | 718 | 593
Other segment items |  |  |  |  |  |  | 802 | 699 | 771
Depreciation and amortization |  |  |  |  |  |  | 71 | 78 | 75
Earnings from equity method investments |  |  |  |  |  |  | (17) | 5 | 3
Interest expense |  |  |  |  |  |  | 1,030 | 879 | 694
Income taxes (benefit) |  |  |  |  |  |  | (292) | (298) | (233)
Segment net income (loss) |  |  |  |  |  |  | (785) | (635) | (711)
Goodwill |  |  |  | 144 |  | 144 | 144 | 144 | 144
Total assets |  |  |  | 2,446 |  | 2,665 | 2,371 | 2,446 | 2,665
Georgia Power |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 11,331 | 10,118 | 11,584
Depreciation and amortization |  |  |  |  |  |  | 1,774 | 1,681 | 1,430
Interest expense |  |  |  |  |  |  | 725 | 626 | 485
Income taxes (benefit) |  |  |  |  |  |  | 603 | 448 | 370
Total assets |  |  |  | 56,817 |  |  | 61,255 | 56,817 |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Estimated loss on Plant Vogtle Units 3 and 4 |  |  | $ (21) |  |  |  | (21) | (68) | 183
Estimated loss on Plant Vogtle Units 3 and 4, net of tax |  |  | $ (16) |  |  |  |  |  |
Georgia Power | Traditional Electric Operating Companies | Plant Vogtle Units 3 and 4 |  |  |  |  |  |  |  |  |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Estimated loss on Plant Vogtle Units 3 and 4 |  |  |  |  |  |  | (21) | (68) | 183
Estimated loss on Plant Vogtle Units 3 and 4, net of tax |  |  |  |  |  |  | (16) | (50) | 137
Southern Power |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 2,014 | 2,189 | 3,369
Depreciation and amortization |  |  |  |  |  |  | 522 | 504 | 516
Interest expense |  |  |  |  |  |  | 117 | 129 | 138
Income taxes (benefit) |  |  |  |  |  |  | (13) | 12 | 20
Segment net income (loss) |  |  |  |  |  |  | 328 | 357 | 354
Total assets |  |  |  | 12,761 |  |  | 12,653 | 12,761 |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  | 18 |  |
Amount awarded from other party |  |  |  |  |  |  | 9 |  |
Gain (loss) on dispositions |  |  |  |  |  |  | 0 | 20 | 2
Southern Power | Kay Wind Facility |  |  |  |  |  |  |  |  |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Pre-tax accelerated depreciation |  |  |  |  |  |  | 9 |  |
Accelerated depreciation, net of tax |  |  |  |  |  |  | 7 |  |
Approximate Nameplate Capacity (MW) | MW | 299 |  |  |  |  |  |  |  |
Southern Company Gas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 4,456 | 4,702 | 5,962
Other segment items |  |  |  |  |  |  | 2,613 | 3,124 | 4,536
Depreciation and amortization |  |  |  |  |  |  | 650 | 582 | 559
Earnings from equity method investments |  |  |  |  |  |  | 146 | 140 | 148
Interest expense |  |  |  |  |  |  | 341 | 310 | 263
Income taxes (benefit) |  |  |  |  |  |  | 258 | 211 | 180
Segment net income (loss) |  |  |  |  |  |  | 740 | 615 | 572
Goodwill |  |  |  | 5,015 |  |  | 5,015 | 5,015 |
Total assets |  |  |  | 25,083 |  | 24,621 | 26,177 | 25,083 | 24,621
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  | 0 | 0 | 131
Estimated loss on regulatory disallowance |  |  |  |  |  |  | 0 | (96) | 0
Southern Company Gas | Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 4,447 | 4,685 | 5,937
Other segment items |  |  |  |  |  |  | 2,598 | 3,109 | 4,401
Depreciation and amortization |  |  |  |  |  |  | 649 | 581 | 537
Earnings from equity method investments |  |  |  |  |  |  | 146 | 140 | 148
Interest expense |  |  |  |  |  |  | 349 | 310 | 259
Income taxes (benefit) |  |  |  |  |  |  | 244 | 195 | 217
Segment net income (loss) |  |  |  |  |  |  | 753 | 630 | 671
Total assets |  |  |  | 26,055 |  | 25,233 | 27,336 | 26,055 | 25,233
Southern Company Gas | Eliminations |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | (14) | (19) | (30)
Other segment items |  |  |  |  |  |  | (14) | (19) | (30)
Depreciation and amortization |  |  |  |  |  |  | 0 | 0 | 0
Earnings from equity method investments |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  | 0 | 0 | 0
Income taxes (benefit) |  |  |  |  |  |  | 0 | 0 | 0
Segment net income (loss) |  |  |  |  |  |  | 0 | 0 | 0
Total assets |  |  |  | (10,647) |  | (9,555) | (11,206) | (10,647) | (9,555)
Southern Company Gas | All Other |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 23 | 36 | 55
Other segment items |  |  |  |  |  |  | 29 | 34 | 165
Depreciation and amortization |  |  |  |  |  |  | 1 | 1 | 22
Earnings from equity method investments |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  | (8) | 0 | 4
Income taxes (benefit) |  |  |  |  |  |  | 14 | 16 | (37)
Segment net income (loss) |  |  |  |  |  |  | (13) | (15) | (99)
Total assets |  |  |  | 9,675 |  | 8,943 | 10,047 | 9,675 | 8,943
Nicor Gas |  |  |  |  |  |  |  |  |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Estimated loss on regulatory disallowance |  |  |  | (58) | $ (38) |  | 96 |  |
Estimated loss on regulatory disallowance, after tax |  |  |  | (44) | $ (28) |  | 72 |  |
Alabama Power |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  | 7,554 | 7,050 | 7,817
Depreciation and amortization |  |  |  |  |  |  | 1,459 | 1,401 | 875
Interest expense |  |  |  |  |  |  | 448 | 425 | 382
Income taxes (benefit) |  |  |  |  |  |  | 360 | 81 | 423
Segment net income (loss) |  |  |  |  |  |  | 1,403 | 1,370 | $ 1,340
Total assets |  |  |  | $ 35,780 |  |  | 36,538 | $ 35,780 |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Impairment charges |  | $ 36 |  |  |  |  |  |  |
Impairment charges, after tax |  | $ 27 |  |  |  |  |  |  |
Spare Parts | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Southern Power |  |  |  |  |  |  |  |  |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Gain on sale |  |  |  |  |  |  | 16 |  |
Gain on sale, after tax |  |  |  |  |  |  | $ 12 |  |
Natural Gas Storage Facilities | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Southern Company Gas |  |  |  |  |  |  |  |  |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Gain (loss) on dispositions |  |  |  |  |  | (131) |  |  |
Gain (loss) on dispositions, after tax |  |  |  |  |  | $ (99) |  |  |

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