Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Consolidated Net Income	$ 853	$ 1,270	$ 1,188	$ 1,071	$ 2,123	$ 2,259
Qualifying hedges:
Changes in fair value, net of tax	35		(5)		49	(4)
Reclassification adjustment for amounts included in net income, net of tax	(31)		15		(43)	47
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	0		0		1	3
Total other comprehensive income	4	$ 3	10	$ 37	7	46
Comprehensive Income	857		1,198		2,130	2,305
Comprehensive loss attributable to noncontrolling interests	(27)		(15)		(91)	(73)
Consolidated Comprehensive Income Attributable to Company	$ 884		$ 1,213		$ 2,221	$ 2,378