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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivative [Line Items]        
Total other operations and maintenance $ 1,409 $ 1,489 $ 2,881 $ 2,929
Depreciation and amortization 1,182 1,112 2,327 2,222
Total interest expense, net of amounts capitalized (694) (610) (1,358) (1,192)
Total other income (expense), net 151 142 302 286
Natural gas        
Derivative [Line Items]        
Total cost of sales 149 199 754 1,097
Other Income (Expense)        
Derivative [Line Items]        
Amount excluded from effectiveness testing recognized in earnings 5 (29) 5 (1)
Cash Flow Hedging | Energy-related derivatives | Cost of Sales        
Derivative [Line Items]        
Gain (loss) on hedges (7) (9) (30) (29)
Cash Flow Hedging | Energy-related derivatives | Operating Expense        
Derivative [Line Items]        
Gain (loss) on hedges 0 0 (1) 0
Cash Flow Hedging | Energy-related derivatives | Depreciation and Amortization        
Derivative [Line Items]        
Gain (loss) on hedges (1) (4) (2) (13)
Cash Flow Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges (4) (5) (8) (9)
Cash Flow Hedging | Foreign currency derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges (3) (2) (6) (5)
Cash Flow Hedging | Foreign currency derivatives | Other Income (Expense)        
Derivative [Line Items]        
Gain (loss) on hedges (5) 0 (17) 10
Fair Value Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges 0 (45) (31) (3)
Fair Value Hedging | Foreign currency derivatives | Other Income (Expense)        
Derivative [Line Items]        
Gain (loss) on hedges (18) 29 21 26
SOUTHERN POWER CO        
Derivative [Line Items]        
Total other operations and maintenance 119 117 241 224
Depreciation and amortization 127 122 245 250
Total interest expense, net of amounts capitalized (30) (33) (59) (66)
Total other income (expense), net 3 2 6 4
SOUTHERN POWER CO | Cash Flow Hedging | Energy-related derivatives | Depreciation and Amortization        
Derivative [Line Items]        
Gain (loss) on hedges (1) (4) (2) (13)
SOUTHERN POWER CO | Cash Flow Hedging | Foreign currency derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges (3) (2) (6) (5)
SOUTHERN POWER CO | Cash Flow Hedging | Foreign currency derivatives | Other Income (Expense)        
Derivative [Line Items]        
Gain (loss) on hedges (5) 0 (17) 10
SOUTHERN Co GAS        
Derivative [Line Items]        
Total cost of sales 149 199 754 1,097
Total other operations and maintenance 288 309 581 615
Depreciation and amortization 158 143 313 284
Total interest expense, net of amounts capitalized (83) (73) (167) (150)
Total other income (expense), net 15 17 35 32
SOUTHERN Co GAS | Natural gas        
Derivative [Line Items]        
Total cost of sales 149 199 754 1,097
SOUTHERN Co GAS | Cash Flow Hedging | Energy-related derivatives | Cost of Sales        
Derivative [Line Items]        
Gain (loss) on hedges (7) (9) (30) (29)
SOUTHERN Co GAS | Cash Flow Hedging | Energy-related derivatives | Operating Expense        
Derivative [Line Items]        
Gain (loss) on hedges 0 0 (1) 0
SOUTHERN Co GAS | Cash Flow Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges 0 0 0 (1)
SOUTHERN Co GAS | Fair Value Hedging | Interest rate derivatives | Interest Expense        
Derivative [Line Items]        
Gain (loss) on hedges $ (6) $ (15) $ (10) $ (2)