v3.25.0.1
LEASES - Balance Sheet Amounts Recorded for Operating and Financing Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Operating Leases    
Operating lease ROU assets, net $ 1,386 $ 1,432
Operating lease obligations - current 200 183
Operating lease obligations - non-current 1,253 1,307
Total operating lease obligations $ 1,453 $ 1,490
Finance Leases    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service
Finance lease ROU assets, net $ 254 $ 272
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Finance lease obligations - current $ 9 $ 11
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-Term Debt Long-Term Debt
Finance lease obligations - non-current $ 278 $ 287
Total finance lease obligations 287 298
Assets Subject to Power Purchase Agreement    
Operating Leases    
Total operating lease obligations 567 566
Alabama Power    
Operating Leases    
Operating lease ROU assets, net $ 84 $ 87
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Operating lease obligations - current $ 14 $ 12
Operating lease obligations - non-current 76 81
Total operating lease obligations $ 90 $ 93
Finance Leases    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service
Finance lease ROU assets, net $ 4 $ 5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Finance lease obligations - current $ 1 $ 2
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-Term Debt Long-Term Debt
Finance lease obligations - non-current $ 3 $ 3
Total finance lease obligations 4 5
Alabama Power | Assets Subject to Power Purchase Agreement    
Operating Leases    
Total operating lease obligations 55 58
Georgia Power    
Operating Leases    
Operating lease ROU assets, net 1,331 884
Operating lease obligations - current 169 135
Operating lease obligations - non-current 1,159 740
Total operating lease obligations $ 1,328 $ 875
Finance Leases    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service
Finance lease ROU assets, net $ 227 $ 203
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Finance lease obligations - current $ 20 $ 18
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-Term Debt Long-Term Debt
Finance lease obligations - non-current $ 241 $ 222
Total finance lease obligations 261 240
Georgia Power | Assets Subject to Power Purchase Agreement    
Operating Leases    
Total operating lease obligations $ 1,300 $ 813
Mississippi Power    
Operating Leases    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other deferred charges and assets Other deferred charges and assets
Operating lease ROU assets, net $ 8 $ 9
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Operating lease obligations - current $ 4 $ 3
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Operating lease obligations - non-current $ 4 $ 6
Total operating lease obligations $ 8 $ 9
Finance Leases    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service
Finance lease ROU assets, net $ 14 $ 15
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Finance lease obligations - current $ 1 $ 1
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-Term Debt Long-Term Debt
Finance lease obligations - non-current $ 13 $ 15
Total finance lease obligations 14 16
Southern Power    
Operating Leases    
Operating lease ROU assets, net $ 484 $ 488
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Operating lease obligations - current $ 29 $ 29
Operating lease obligations - non-current 511 517
Total operating lease obligations 540 546
Finance Leases    
Finance lease ROU assets, net 0 0
Finance lease obligations - current 0 0
Finance lease obligations - non-current 0 0
Total finance lease obligations 0 0
Southern Company Gas    
Operating Leases    
Operating lease ROU assets, net $ 38 $ 47
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Operating lease obligations - current $ 11 $ 11
Operating lease obligations - non-current 30 40
Total operating lease obligations 41 51
Finance Leases    
Finance lease ROU assets, net 0 0
Finance lease obligations - current 0 0
Finance lease obligations - non-current 0 0
Total finance lease obligations $ 0 $ 0