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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
--- | --- | --- | ---
Dec. 31, 2021 USD ($) project | Jul. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2023 USD ($) project | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | $ 25,253 | $ 29,279 | $ 23,113
Depreciation and amortization |  |  |  |  |  |  |  | 4,525 | 3,663 | 3,565
Interest income |  |  |  |  |  |  |  | 85 | 59 | 22
Earnings from equity method investments |  |  |  |  |  |  |  | 144 | 151 | 76
Interest expense |  |  |  |  |  |  |  | 2,446 | 2,022 | 1,837
Income taxes (benefit) |  |  |  |  |  |  |  | 496 | 795 | 267
Segment net income (loss) |  |  |  |  |  |  |  | 3,976 | 3,524 | 2,393
Goodwill | $ 5,280 |  | $ 5,161 |  | $ 5,161 |  |  | 5,161 | 5,161 | 5,280
Total assets | 127,534 |  | 139,331 |  | 134,891 |  |  | 139,331 | 134,891 | 127,534
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Estimated loss on Plant Vogtle Units 3 and 4 |  |  |  |  |  |  |  | (68) | 183 | 1,692
Impairment charges |  |  |  |  |  |  |  | $ 0 | 251 | 2
Gain (loss) on termination of leveraged leases | 93 |  |  |  |  |  |  |  |  |
Gain (loss) on termination of leveraged leases, after tax | $ 99 |  |  |  |  |  |  |  |  |
Number of international projects subject to leveraged lease terminated | project | 2 |  |  |  |  |  |  | 2 |  |
Southern Company Gas |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | $ 4,702 | 5,962 | 4,380
Operating Segments | Electric Utilities |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 19,998 | 22,873 | 18,300
Depreciation and amortization |  |  |  |  |  |  |  | 3,865 | 3,029 | 2,953
Interest income |  |  |  |  |  |  |  | 76 | 47 | 21
Earnings from equity method investments |  |  |  |  |  |  |  | (1) | 0 | 1
Interest expense |  |  |  |  |  |  |  | 1,274 | 1,067 | 968
Income taxes (benefit) |  |  |  |  |  |  |  | 583 | 848 | 219
Segment net income (loss) |  |  |  |  |  |  |  | 3,994 | 3,672 | 2,247
Goodwill | $ 2 |  | 2 |  | 2 |  |  | 2 | 2 | 2
Total assets | 101,774 |  | 112,645 |  | 108,283 |  |  | 112,645 | 108,283 | 101,774
Operating Segments | Traditional Electric Operating Companies |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 18,358 | 20,408 | 16,614
Depreciation and amortization |  |  |  |  |  |  |  | 3,361 | 2,513 | 2,436
Interest income |  |  |  |  |  |  |  | 69 | 44 | 20
Earnings from equity method investments |  |  |  |  |  |  |  | (1) | 0 | 1
Interest expense |  |  |  |  |  |  |  | 1,145 | 929 | 821
Income taxes (benefit) |  |  |  |  |  |  |  | 571 | 828 | 232
Segment net income (loss) |  |  |  |  |  |  |  | 3,637 | 3,318 | 1,981
Goodwill | 0 |  | 0 |  | 0 |  |  | 0 | 0 | 0
Total assets | 89,051 |  | 100,429 |  | 95,861 |  |  | 100,429 | 95,861 | 89,051
Operating Segments | Southern Power |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 2,189 | 3,369 | 2,216
Depreciation and amortization |  |  |  |  |  |  |  | 504 | 516 | 517
Interest income |  |  |  |  |  |  |  | 7 | 3 | 1
Earnings from equity method investments |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  | 129 | 138 | 147
Income taxes (benefit) |  |  |  |  |  |  |  | 12 | 20 | (13)
Segment net income (loss) |  |  |  |  |  |  |  | 357 | 354 | 266
Goodwill | 2 |  | 2 |  | 2 |  |  | 2 | 2 | 2
Total assets | 13,390 |  | 12,761 |  | 13,081 |  |  | 12,761 | 13,081 | 13,390
Operating Segments | Southern Company Gas |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 4,702 | 5,962 | 4,380
Depreciation and amortization |  |  |  |  |  |  |  | 582 | 559 | 536
Interest income |  |  |  |  |  |  |  | 9 | 3 | 0
Earnings from equity method investments |  |  |  |  |  |  |  | 140 | 148 | 50
Interest expense |  |  |  |  |  |  |  | 310 | 263 | 238
Income taxes (benefit) |  |  |  |  |  |  |  | 211 | 180 | 275
Segment net income (loss) |  |  |  |  |  |  |  | 615 | 572 | 539
Goodwill | 5,015 |  | 5,015 |  | 5,015 |  |  | 5,015 | 5,015 | 5,015
Total assets | 23,560 |  | 25,083 |  | 24,621 |  |  | 25,083 | 24,621 | 23,560
Operating Segments | All Other |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 718 | 593 | 582
Depreciation and amortization |  |  |  |  |  |  |  | 78 | 75 | 76
Interest income |  |  |  |  |  |  |  | 26 | 16 | 4
Earnings from equity method investments |  |  |  |  |  |  |  | 5 | 3 | 24
Interest expense |  |  |  |  |  |  |  | 879 | 694 | 631
Income taxes (benefit) |  |  |  |  |  |  |  | (298) | (233) | (227)
Segment net income (loss) |  |  |  |  |  |  |  | (635) | (711) | (384)
Goodwill | 263 |  | 144 |  | 144 |  |  | 144 | 144 | 263
Total assets | 2,975 |  | 2,446 |  | 2,665 |  |  | 2,446 | 2,665 | 2,975
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | (165) | (149) | (149)
Depreciation and amortization |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  | (26) | (7) | (3)
Earnings from equity method investments |  |  |  |  |  |  |  | 0 | 0 | 1
Interest expense |  |  |  |  |  |  |  | (17) | (2) | 0
Income taxes (benefit) |  |  |  |  |  |  |  | 0 | 0 | 0
Segment net income (loss) |  |  |  |  |  |  |  | 2 | (9) | (9)
Goodwill | 0 |  | 0 |  | 0 |  |  | 0 | 0 | 0
Total assets | (775) |  | (843) |  | (678) |  |  | (843) | (678) | (775)
Intersegment Eliminations | Electric Utilities |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | (549) | (904) | (530)
Depreciation and amortization |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  | 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 | 0
Total assets | (667) |  | (545) |  | (659) |  |  | (545) | (659) | (667)
Georgia Power |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 10,118 | 11,584 | 9,260
Depreciation and amortization |  |  |  |  |  |  |  | 1,681 | 1,430 | 1,371
Interest expense |  |  |  |  |  |  |  | 626 | 485 | 421
Income taxes (benefit) |  |  |  |  |  |  |  | 448 | 370 | (168)
Total assets |  |  | 56,817 |  | 53,163 |  |  | 56,817 | 53,163 |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Estimated loss on Plant Vogtle Units 3 and 4 |  |  |  |  |  |  |  | (68) | 183 | 1,692
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 |  |  |  |  |  |  |  | (68) | 183 | 1,700
Estimated loss on Plant Vogtle Units 3 and 4, net of tax |  |  |  |  |  |  |  | (50) | 137 | 1,300
Southern Power |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 2,189 | 3,369 | 2,216
Depreciation and amortization |  |  |  |  |  |  |  | 504 | 516 | 517
Interest expense |  |  |  |  |  |  |  | 129 | 138 | 147
Income taxes (benefit) |  |  |  |  |  |  |  | 12 | 20 | (13)
Segment net income (loss) |  |  |  |  |  |  |  | 357 | 354 | 266
Total assets |  |  | 12,761 |  | 13,081 |  |  | 12,761 | 13,081 |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Amount awarded from other party |  |  |  |  |  |  |  | 9 |  |
Gain (loss) on dispositions |  |  |  |  |  |  |  | 20 | 2 | 41
Southern Power | Southern Power vs First Solar | Settled Litigation |  |  |  |  |  |  |  |  |  |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  | 18 |  |
Southern Power | Wind Generating Facility |  |  |  |  |  |  |  |  |  |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Gain (loss) on dispositions |  |  |  |  |  |  |  | 37 |  | 37
Gain (loss) on dispositions, after tax |  |  |  |  |  |  |  | 28 |  |
Southern Company Gas |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 4,702 | 5,962 | 4,380
Depreciation and amortization |  |  |  |  |  |  |  | 582 | 559 | 536
Earnings from equity method investments |  |  |  |  |  |  |  | 140 | 148 | 50
Interest expense |  |  |  |  |  |  |  | 310 | 263 | 238
Income taxes (benefit) |  |  |  |  |  |  |  | 211 | 180 | 275
Segment net income (loss) |  |  |  |  |  |  |  | 615 | 572 | 539
Goodwill |  |  | 5,015 |  | 5,015 |  |  | 5,015 | 5,015 |
Total assets | 23,560 |  | 25,083 |  | 24,621 |  |  | 25,083 | 24,621 | 23,560
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Estimated loss on regulatory disallowance |  |  |  |  |  |  |  | (96) | 0 | 0
Gain (loss) on dispositions |  |  |  |  |  |  |  | 7 | 4 | 127
Impairment charges |  |  |  |  |  |  |  | 0 | 131 | 0
Southern Company Gas | PennEast Pipeline |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Earnings from equity method investments |  |  |  |  |  |  |  | 0 | 0 | (81)
Income taxes (benefit) |  |  |  |  |  |  |  |  |  | 7
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 2 | $ 82 | 84 |  | 84
Impairment charges, after tax |  |  |  |  |  | $ 2 | $ 58 | 67 |  | 67
Southern Company Gas | Operating Segments |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 4,685 | 5,937 | 4,374
Depreciation and amortization |  |  |  |  |  |  |  | 581 | 537 | 505
Earnings from equity method investments |  |  |  |  |  |  |  | 140 | 148 | 50
Interest expense |  |  |  |  |  |  |  | 310 | 259 | 237
Income taxes (benefit) |  |  |  |  |  |  |  | 195 | 217 | 213
Segment net income (loss) |  |  |  |  |  |  |  | 630 | 671 | 626
Total assets | 23,971 |  | 26,055 |  | 25,233 |  |  | 26,055 | 25,233 | 23,971
Southern Company Gas | Operating Segments | All Other |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | 36 | 55 | 38
Depreciation and amortization |  |  |  |  |  |  |  | 1 | 22 | 31
Earnings from equity method investments |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  | 0 | 4 | 1
Income taxes (benefit) |  |  |  |  |  |  |  | 16 | (37) | 62
Segment net income (loss) |  |  |  |  |  |  |  | (15) | (99) | (87)
Total assets | 12,114 |  | 9,675 |  | 8,943 |  |  | 9,675 | 8,943 | 12,114
Southern Company Gas | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  | (19) | (30) | (32)
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 | $ (12,525) |  | (10,647) |  | (9,555) |  |  | (10,647) | $ (9,555) | (12,525)
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 |  |
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) |  |  |  |  |
Sequent | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Southern Company Gas |  |  |  |  |  |  |  |  |  |
Segment and Related Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Gain (loss) on dispositions |  | $ 121 |  |  |  |  |  | 121 |  | 121
Gain (loss) on dispositions, after tax |  | 92 |  |  |  |  |  | 92 |  | 92
Deferred tax expense, increase from change in appointment rate |  | $ 85 |  |  |  |  |  | $ 85 |  | $ 85

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