Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 823	$ 1,089	$ 1,622	$ 2,079
Qualifying hedges:
Changes in fair value, net of tax	28	(45)	(36)	(26)
Reclassification adjustment for amounts included in net income, net of tax	15	54	34	74
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	2	0	5
Total other comprehensive income (loss)	43	11	(2)	53
Comprehensive Income	866	1,100	1,620	2,132
Dividends on preferred stock of subsidiaries	0	4	0	7
Comprehensive loss attributable to noncontrolling interests	(15)	(22)	(78)	(67)
Comprehensive Income	$ 881	$ 1,118	$ 1,698	$ 2,192