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Derivatives - Schedule of Pre-Tax Effects of Cash Flow and Fair Value Hedging on Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivative [Line Items]        
Depreciation and amortization $ 1,112 $ 913 $ 2,222 $ 1,805
Total interest expense, net of amounts capitalized (610) (488) (1,192) (950)
Total other income (expense), net 142 139 286 283
Natural gas        
Derivative [Line Items]        
Total cost of sales 199 452 1,097 1,546
Other Income (Expense)        
Derivative [Line Items]        
Amount excluded from effectiveness testing recognized in earnings (29) 7 (1) 3
Cash Flow Hedging | Energy-related derivatives | Cost of Sales        
Derivative [Line Items]        
Gain (loss) on hedges (9) 10 (29) 18
Cash Flow Hedging | Energy-related derivatives | Depreciation and Amortization        
Derivative [Line Items]        
Gain (loss) on hedges (4) 4 (13) 6
Cash Flow Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges (5) (6) (9) (13)
Cash Flow Hedging | Foreign currency derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges (2) (7) (5) (13)
Cash Flow Hedging | Foreign currency derivatives | Other Income (Expense)        
Derivative [Line Items]        
Gain (loss) on hedges 0 (73) 10 (97)
Fair Value Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges (45) (76) (3) (198)
Fair Value Hedging | Foreign currency derivatives | Other Income (Expense)        
Derivative [Line Items]        
Gain (loss) on hedges 29 (96) 26 (121)
SOUTHERN POWER CO        
Derivative [Line Items]        
Depreciation and amortization 122 131 250 251
Total interest expense, net of amounts capitalized (33) (36) (66) (73)
Total other income (expense), net 2 1 4 3
SOUTHERN POWER CO | Cash Flow Hedging | Energy-related derivatives | Depreciation and Amortization        
Derivative [Line Items]        
Gain (loss) on hedges (4) 4 (13) 6
SOUTHERN POWER CO | Cash Flow Hedging | Foreign currency derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges (2) (7) (5) (13)
SOUTHERN POWER CO | Cash Flow Hedging | Foreign currency derivatives | Other Income (Expense)        
Derivative [Line Items]        
Gain (loss) on hedges 0 (73) 10 (97)
SOUTHERN Co GAS        
Derivative [Line Items]        
Depreciation and amortization 143 138 284 275
Total interest expense, net of amounts capitalized (73) (61) (150) (122)
Total other income (expense), net 17 16 32 32
SOUTHERN Co GAS | Natural gas        
Derivative [Line Items]        
Total cost of sales 199 452 1,097 1,546
SOUTHERN Co GAS | Cash Flow Hedging | Energy-related derivatives | Cost of Sales        
Derivative [Line Items]        
Gain (loss) on hedges (9) 10 (29) 18
SOUTHERN Co GAS | Cash Flow Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges 0 (1) (1) (1)
SOUTHERN Co GAS | Fair Value Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges (15) (22) (2) (57)
Traditional Electric Operating Companies | Cash Flow Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges 0 0 0 0
Traditional Electric Operating Companies | Fair Value Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges $ 0 $ 0 $ 0 $ 0