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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - GAS - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income $ 1,711 $ 1,535 $ 3,925 $ 3,867
Qualifying hedges:        
Changes in fair value, net of tax (13) (2) 36 (5)
Reclassification adjustment for amounts included in net income, net of tax 5 (8) (38) 39
Pension and other postretirement benefit plans:        
Reclassification adjustment for amounts included in net income, net of tax of $—, $—, $—, and $—, respectively 0 1 0 1
Consolidated Comprehensive Income Attributable to Company 1,703 1,526 3,924 3,905
SOUTHERN Co GAS        
Net income 25 38 549 555
Qualifying hedges:        
Changes in fair value, net of tax (8) (7) (2) (10)
Reclassification adjustment for amounts included in net income, net of tax 1 3 1 25
Pension and other postretirement benefit plans:        
Reclassification adjustment for amounts included in net income, net of tax of $—, $—, $—, and $—, respectively 0 0 (1) 0
Total other comprehensive income (loss) (7) (4) (2) 15
Consolidated Comprehensive Income Attributable to Company $ 18 $ 34 $ 547 $ 570