Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,487	$ 1,110	$ 3,566	$ 2,592
Qualifying hedges:
Changes in fair value, net of tax	0	1	(27)	(15)
Reclassification adjustment for amounts included in net income, net of tax	26	31	100	81
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	2	4	8	10
Total other comprehensive income	28	36	81	76
Comprehensive Income	1,515	1,146	3,647	2,668
Dividends on preferred stock of subsidiaries	3	4	10	11
Comprehensive income (loss) attributable to noncontrolling interests	12	5	(55)	(27)
Comprehensive Income	$ 1,500	$ 1,137	$ 3,692	$ 2,684