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Introduction - Schedule of Amortization of Other Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets $ 7 $ 8
Decrease in operating revenues 5 5
SOUTHERN POWER CO    
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets 5 5
SOUTHERN Co GAS    
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets $ 1 $ 2