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DERIVATIVES - Pre-Tax Effects of Derivatives Designated as Cash Flow and Fair Value Hedging (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative $ (154)    
Gain (Loss) Recognized in OCI on Derivative   $ (62) $ 91
Depreciation and amortization 3,038 3,131 3,010
Interest expense, net of amounts capitalized (1,736) (1,842) (1,694)
Other income (expense), net 252 114 163
Energy-related derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (13)    
Gain (Loss) Recognized in OCI on Derivative   17 (47)
Energy-related derivatives | Cost of Sales | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (2)    
Gain (Loss) Recognized in OCI on Derivative   2 (2)
Energy-related derivatives | Depreciation and Amortization | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (6)    
Gain (Loss) Recognized in OCI on Derivative   7 (16)
Interest rate derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (57)    
Gain (Loss) Recognized in OCI on Derivative   (1) (2)
Interest rate derivatives | Interest Expense | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (20)    
Gain (Loss) Recognized in OCI on Derivative   (21) (21)
Interest rate derivatives | Interest Expense | Fair Value Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative 42    
Gain (Loss) Recognized in OCI on Derivative   (12) (22)
Foreign currency derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (84)    
Gain (Loss) Recognized in OCI on Derivative   (78) 140
Foreign currency derivatives | Interest Expense | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (24)    
Gain (Loss) Recognized in OCI on Derivative   (24) (23)
Foreign currency derivatives | Other Income (Expense) | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (24)    
Gain (Loss) Recognized in OCI on Derivative   (60) 160
Natural gas revenues      
Derivative Instruments, Gain (Loss) [Line Items]      
Cost of revenue 1,319 1,539 1,601
Alabama Power      
Derivative Instruments, Gain (Loss) [Line Items]      
Depreciation and amortization 793 764 736
Interest expense, net of amounts capitalized (336) (323) (305)
Other income (expense), net 46 20 43
Alabama Power | Interest rate derivatives | Interest Expense | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (6)    
Gain (Loss) Recognized in OCI on Derivative   (6) (6)
Georgia Power      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (59)    
Gain (Loss) Recognized in OCI on Derivative   0 1
Depreciation and amortization 981 923 895
Interest expense, net of amounts capitalized (409) (397) (419)
Other income (expense), net 140 115 104
Georgia Power | Interest rate derivatives | Interest Expense | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (3)    
Gain (Loss) Recognized in OCI on Derivative   (4) (4)
Georgia Power | Interest rate derivatives | Interest Expense | Fair Value Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative 2    
Gain (Loss) Recognized in OCI on Derivative   2 (3)
Mississippi Power      
Derivative Instruments, Gain (Loss) [Line Items]      
Depreciation and amortization 192 169 161
Interest expense, net of amounts capitalized (69) (76) (42)
Other income (expense), net 12 17 1
Mississippi Power | Interest rate derivatives | Interest Expense | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (2)    
Gain (Loss) Recognized in OCI on Derivative   (2) (2)
Southern Power      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (88)    
Gain (Loss) Recognized in OCI on Derivative   (68) 102
Depreciation and amortization 479 493 503
Interest expense, net of amounts capitalized (169) (183) (191)
Other income (expense), net 47 23 1
Southern Power | Energy-related derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (4)    
Gain (Loss) Recognized in OCI on Derivative   10 (38)
Southern Power | Energy-related derivatives | Depreciation and Amortization | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (6)    
Gain (Loss) Recognized in OCI on Derivative   7 (17)
Southern Power | Foreign currency derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (84)    
Gain (Loss) Recognized in OCI on Derivative   (78) 140
Southern Power | Foreign currency derivatives | Interest Expense | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (24)    
Gain (Loss) Recognized in OCI on Derivative   (24) (23)
Southern Power | Foreign currency derivatives | Other Income (Expense) | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (24)    
Gain (Loss) Recognized in OCI on Derivative   (60) 159
Southern Company Gas      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (7)    
Gain (Loss) Recognized in OCI on Derivative   7 (9)
Interest expense, net of amounts capitalized (232) (228) (200)
Other income (expense), net 20 1 44
Southern Company Gas | Energy-related derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (9)    
Gain (Loss) Recognized in OCI on Derivative   7 (9)
Southern Company Gas | Interest rate derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative 2    
Gain (Loss) Recognized in OCI on Derivative   0 0
Southern Company Gas | Foreign currency derivatives | Other Income (Expense) | Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI on Derivative (2)    
Gain (Loss) Recognized in OCI on Derivative   2 (2)
Southern Company Gas | Natural gas revenues      
Derivative Instruments, Gain (Loss) [Line Items]      
Cost of revenue $ 1,319 $ 1,539 $ 1,601