v3.25.0.1
SEGMENT AND RELATED INFORMATION - Traditional Electric Companies (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Total operating revenues     $ 26,724 $ 25,253 $ 29,279
Total utility operations and maintenance     6,539 6,093 6,824
Other segment items     13,995 13,954 19,426
Depreciation and amortization     4,755 4,525 3,663
Interest expense     2,743 2,446 2,022
Income taxes (benefit)     969 496 795
Net Income     4,260 3,849 3,428
Estimated Loss On Plant Vogtle Units 3 And 4     (21) (68) 183
Alabama Power          
Segment Reporting Information [Line Items]          
Total operating revenues     7,554 7,050 7,817
Total utility operations and maintenance     1,895 1,769 1,935
Depreciation and amortization     1,459 1,401 875
Interest expense     448 425 382
Income taxes (benefit)     360 81 423
Net Income     1,403 1,370 1,351
Impairment charges $ 36        
Impairment charges, after tax $ 27        
Alabama Power | Reportable Segment          
Segment Reporting Information [Line Items]          
Total operating revenues     7,554 7,050 7,817
Rate RSE expenses     1,480 1,421 1,645
Rate CNP Compliance expenses     279 254 237
Total utility operations and maintenance     1,759 1,675 1,882
Other segment items     2,125 2,098 2,915
Depreciation and amortization     1,459 1,401 875
Interest expense     448 425 382
Income taxes (benefit)     360 81 423
Net Income     1,403 1,370 1,340
Capital expenditures     2,114 2,159 2,206
Georgia Power          
Segment Reporting Information [Line Items]          
Total operating revenues     11,331 10,118 11,584
Total utility operations and maintenance     2,372 2,083 2,349
Depreciation and amortization     1,774 1,681 1,430
Interest expense     725 626 485
Income taxes (benefit)     603 448 370
Net Income     2,543 2,080 1,813
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 | Reportable Segment          
Segment Reporting Information [Line Items]          
Total operating revenues     11,331 10,118 11,584
Total utility operations and maintenance     2,210 1,901 2,237
Other segment items     3,476 3,382 5,249
Depreciation and amortization     1,774 1,681 1,430
Interest expense     725 626 485
Income taxes (benefit)     603 448 370
Net Income     2,543 2,080 1,813
Capital expenditures     5,355 5,394 4,219
Georgia Power | Traditional Electric Operating Companies | Plant Vogtle Units 3 and 4          
Segment Reporting Information [Line Items]          
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 Company And Georgia Power | Disposal Group, Held-for-sale, Not Discontinued Operations          
Segment Reporting Information [Line Items]          
Gain on sale   114      
Gain on sale, after tax   $ 84      
Mississippi Power          
Segment Reporting Information [Line Items]          
Total operating revenues     1,463 1,474 1,694
Total utility operations and maintenance     370 362 376
Depreciation and amortization     193 190 181
Interest expense     77 71 56
Income taxes (benefit)     47 36 37
Net Income     199 188 164
Mississippi Power | Reportable Segment          
Segment Reporting Information [Line Items]          
Other segment items     $ 900 $ 1,000 $ 1,300