Consolidated Statements of Comprehensive Income - Southern - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
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
Total other comprehensive income (loss)	71	158	(75)
Dividends on preferred stock of subsidiaries	11	15	15
Comprehensive loss attributable to noncontrolling interests	(107)	(99)	(31)
Comprehensive Income (Loss) Attributable to Parent	$ 3,595	$ 2,551	$ 3,044