Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Consolidated Net Income	$ 1,707	$ 853	$ 1,270	$ 1,535	$ 1,188	$ 1,071	$ 3,830	$ 3,794
Qualifying hedges:
Changes in fair value, net of tax	(13)			(2)			36	(5)
Reclassification adjustment for amounts included in net income, net of tax	5			(8)			(38)	39
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	0			0			1	3
Total other comprehensive income (loss)	(8)	$ 4	$ 3	(9)	$ 10	$ 37	(1)	38
Comprehensive Income	1,699			1,526			3,829	3,832
Comprehensive loss attributable to noncontrolling interests	(4)			0			(95)	(73)
Consolidated Comprehensive Income Attributable to Company	$ 1,703			$ 1,526			$ 3,924	$ 3,905