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Consolidated Statements of Comprehensive Income - GAS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net Income (Loss) $ 3,428 $ 2,309 $ 3,103
Qualifying hedges:      
Changes in fair value, net of tax (60) (49) 10
Reclassification adjustment for amounts included in net income, net of tax 73 96 (40)
Pension and other postretirement benefit plans:      
Benefit plan net gain (loss), net of tax 48 98 (55)
Current period change 71 158 (75)
Comprehensive Income (Loss) Attributable to Parent 3,595 2,551 3,044
Southern Company Gas      
Net Income (Loss) 572 539 590
Qualifying hedges:      
Changes in fair value, net of tax 13 17 (21)
Reclassification adjustment for amounts included in net income, net of tax (24) (11) 7
Pension and other postretirement benefit plans:      
Benefit plan net gain (loss), net of tax 18 40 (15)
Current period change 7 46 (29)
Comprehensive Income (Loss) Attributable to Parent $ 579 $ 585 $ 561