Consolidated Statements of Comprehensive Income - SPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Income (Loss)	$ 2,309	$ 3,103	$ 4,744
Qualifying hedges:
Changes in fair value, net of tax	(49)	10	(115)
Reclassification adjustment for amounts included in net income, net of tax	96	(40)	57
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	98	(55)	(64)
Reclassification adjustment for amounts included in net income, net of tax	13	10	4
Current period change	158	(75)	(118)
Comprehensive loss attributable to noncontrolling interests	(99)	(31)	(10)
Comprehensive Income (Loss) Attributable to Parent	2,551	3,044	4,621
Southern Power
Net Income (Loss)	167	207	329
Qualifying hedges:
Changes in fair value, net of tax	(67)	33	(66)
Reclassification adjustment for amounts included in net income, net of tax	89	(65)	41
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	16	(12)	(17)
Reclassification adjustment for amounts included in net income, net of tax	2	2	0
Current period change	40	(42)	(42)
Comprehensive loss attributable to noncontrolling interests	(99)	(31)	(10)
Comprehensive Income (Loss) Attributable to Parent	$ 306	$ 196	$ 297