Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Consolidated Net Income	$ 1,338	$ 1,270
Qualifying hedges:
Changes in fair value, net of tax	(3)	14
Reclassification adjustment for amounts included in net income, net of tax	4	(12)
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	1	1
Total other comprehensive income	2	3
Comprehensive Income	1,340	1,273
Comprehensive loss attributable to noncontrolling interests	(18)	(64)
Consolidated Comprehensive Income Attributable to Company	$ 1,358	$ 1,337