Consolidated Statements of Comprehensive Income - Southern - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 3,849	$ 3,428	$ 2,309
Qualifying hedges:
Changes in fair value, net of tax	(41)	(60)	(49)
Reclassification adjustment for amounts included in net income, net of tax	69	73	96
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	(39)	48	98
Reclassification adjustment for amounts included in net income, net of tax	1	10	13
Total other comprehensive income (loss)	(10)	71	158
Dividends on preferred stock of subsidiaries	0	11	15
Comprehensive loss attributable to noncontrolling interests	(127)	(107)	(99)
Comprehensive Income	$ 3,966	$ 3,595	$ 2,551