Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Consolidated Net Income	$ 1,432	$ 1,487	$ 3,053	$ 3,566
Qualifying hedges:
Changes in fair value, net of tax	2	0	(34)	(27)
Reclassification adjustment for amounts included in net income, net of tax	36	26	70	100
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	2	1	8
Total other comprehensive income	38	28	37	81
Comprehensive Income	1,470	1,515	3,090	3,647
Dividends on preferred stock of subsidiaries	0	3	0	10
Comprehensive income (loss) attributable to noncontrolling interests	10	12	(68)	(55)
Comprehensive Income	$ 1,460	$ 1,500	$ 3,158	$ 3,692