Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 799	$ 991
Qualifying hedges:
Changes in fair value, net of tax	(63)	19
Reclassification adjustment for amounts included in net income, net of tax	19	20
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	3
Total other comprehensive income (loss)	(44)	42
Comprehensive Income	755	1,033
Dividends on preferred stock of subsidiaries	0	4
Comprehensive loss attributable to noncontrolling interests	(63)	(45)
Comprehensive Income	$ 818	$ 1,074