v3.25.0.1
LEASES - Lease Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Lease cost      
Operating lease cost $ 248 $ 252 $ 297
Finance lease cost:      
Amortization of ROU assets 20 24 23
Interest on lease obligations 15 14 13
Total finance lease cost 35 38 36
Short-term lease costs 37 40 64
Variable lease cost 48 47 125
Sublease income     (1)
Total lease cost 368 377 521
Assets Subject to Power Purchase Agreement      
Lease cost      
Operating lease cost 108 112 162
Alabama Power      
Lease cost      
Operating lease cost 19 16 59
Finance lease cost:      
Amortization of ROU assets 2 2 1
Interest on lease obligations 0 0 0
Total finance lease cost 2 2 1
Short-term lease costs 15 16 44
Variable lease cost   0 13
Variable lease cost (1)    
Sublease income     0
Total lease cost 35 34 117
Alabama Power | Assets Subject to Power Purchase Agreement      
Lease cost      
Operating lease cost 5 4 48
Georgia Power      
Lease cost      
Operating lease cost 190 192 198
Finance lease cost:      
Amortization of ROU assets 23 19 15
Interest on lease obligations 15 17 17
Total finance lease cost 38 36 32
Short-term lease costs 15 16 13
Variable lease cost 77 74 105
Sublease income     0
Total lease cost 320 318 348
Georgia Power | Assets Subject to Power Purchase Agreement      
Lease cost      
Operating lease cost 168 174 180
Mississippi Power      
Lease cost      
Operating lease cost 4 5 5
Finance lease cost:      
Amortization of ROU assets 1 1 1
Interest on lease obligations 1 0 1
Total finance lease cost 2 1 2
Short-term lease costs 0 0 0
Variable lease cost 0 0 0
Sublease income     0
Total lease cost 6 6 7
Southern Power      
Lease cost      
Operating lease cost 27 34 32
Finance lease cost:      
Amortization of ROU assets 0 0 0
Interest on lease obligations 0 0 0
Total finance lease cost 0 0 0
Short-term lease costs 0 0 0
Variable lease cost 4 4 5
Sublease income     0
Total lease cost 31 38 37
Southern Company Gas      
Lease cost      
Operating lease cost 12 12 15
Finance lease cost:      
Amortization of ROU assets 0 0 0
Interest on lease obligations 0 0 0
Total finance lease cost 0 0 0
Short-term lease costs 0 0 0
Variable lease cost 0 0 0
Sublease income     0
Total lease cost $ 12 $ 12 $ 15