Consolidated Statements of Comprehensive Income - Southern - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 4,260	$ 3,849	$ 3,428
Qualifying hedges:
Changes in fair value, net of tax	(5)	(41)	(60)
Reclassification adjustment for amounts included in net income, net of tax	80	69	73
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	23	(39)	48
Reclassification adjustment for amounts included in net income, net of tax	1	1	10
Total other comprehensive income (loss)	99	(10)	71
Dividends on preferred stock of subsidiaries	0	0	11
Comprehensive loss attributable to noncontrolling interests	(141)	(127)	(107)
Comprehensive Income	$ 4,500	$ 3,966	$ 3,595