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Consolidated Statements of Comprehensive Income - SPC - 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)
Reclassification adjustment for amounts included in net income, net of tax 10 13 10
Current period change 71 158 (75)
Comprehensive loss attributable to noncontrolling interests (107) (99) (31)
Comprehensive Income (Loss) Attributable to Parent 3,595 2,551 3,044
Southern Power      
Net Income (Loss) 247 167 207
Qualifying hedges:      
Changes in fair value, net of tax (91) (67) 33
Reclassification adjustment for amounts included in net income, net of tax 81 89 (65)
Pension and other postretirement benefit plans:      
Benefit plan net gain (loss), net of tax 18 16 (12)
Reclassification adjustment for amounts included in net income, net of tax 2 2 2
Current period change 10 40 (42)
Comprehensive loss attributable to noncontrolling interests (107) (99) (31)
Comprehensive Income (Loss) Attributable to Parent $ 364 $ 306 $ 196