v3.25.0.1
LEASES - Major Categories of Lease Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Lessee, Lease, Description [Line Items]    
Lease obligations $ 1,740 $ 1,788
Alabama Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 94 98
Georgia Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 1,589 1,115
Mississippi Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 22 25
Southern Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 540 546
Southern Company Gas    
Lessee, Lease, Description [Line Items]    
Lease obligations 41 51
Electric generating units(*)    
Lessee, Lease, Description [Line Items]    
Lease obligations 672 670
Electric generating units(*) | Alabama Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 56 58
Electric generating units(*) | Georgia Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 1,509 1,028
Electric generating units(*) | Mississippi Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 0 0
Electric generating units(*) | Southern Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 0 0
Electric generating units(*) | Southern Company Gas    
Lessee, Lease, Description [Line Items]    
Lease obligations 0 0
Real estate/land    
Lessee, Lease, Description [Line Items]    
Lease obligations 834 871
Real estate/land | Alabama Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 3 4
Real estate/land | Georgia Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 45 54
Real estate/land | Mississippi Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 2 2
Real estate/land | Southern Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 540 546
Real estate/land | Southern Company Gas    
Lessee, Lease, Description [Line Items]    
Lease obligations 20 28
Communication towers    
Lessee, Lease, Description [Line Items]    
Lease obligations 118 123
Communication towers | Alabama Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 2 1
Communication towers | Georgia Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 4 4
Communication towers | Mississippi Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 0 0
Communication towers | Southern Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 0 0
Communication towers | Southern Company Gas    
Lessee, Lease, Description [Line Items]    
Lease obligations 21 23
Railcars    
Lessee, Lease, Description [Line Items]    
Lease obligations 64 64
Railcars | Alabama Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 31 32
Railcars | Georgia Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 29 27
Railcars | Mississippi Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 4 5
Railcars | Southern Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 0 0
Railcars | Southern Company Gas    
Lessee, Lease, Description [Line Items]    
Lease obligations 0 0
Other    
Lessee, Lease, Description [Line Items]    
Lease obligations 52 60
Other | Alabama Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 2 3
Other | Georgia Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 2 2
Other | Mississippi Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 16 18
Other | Southern Power    
Lessee, Lease, Description [Line Items]    
Lease obligations 0 0
Other | Southern Company Gas    
Lessee, Lease, Description [Line Items]    
Lease obligations $ 0 $ 0