Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Consolidated Net Income	$ 1,071	$ 799
Qualifying hedges:
Changes in fair value, net of tax	1	(63)
Reclassification adjustment for amounts included in net income, net of tax	32	19
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax of $1 and $—, respectively	4	0
Total other comprehensive income (loss)	37	(44)
Comprehensive Income	1,108	755
Comprehensive loss attributable to noncontrolling interests	(58)	(63)
Comprehensive Income	$ 1,166	$ 818