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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - GAS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net income $ 880 $ 1,203 $ 2,214 $ 2,332
Qualifying hedges:        
Changes in fair value, net of tax 35 (5) 49 (4)
Reclassification adjustment for amounts included in net income, net of tax (31) 15 (43) 47
Pension and other postretirement benefit plans:        
Consolidated Comprehensive Income Attributable to Company 884 1,213 2,221 2,378
SOUTHERN Co GAS        
Net income 106 108 524 517
Qualifying hedges:        
Changes in fair value, net of tax (6) 2 6 (3)
Reclassification adjustment for amounts included in net income, net of tax (1) 5 0 22
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) 7 5 19
Consolidated Comprehensive Income Attributable to Company $ 99 $ 115 $ 529 $ 536