Consolidated Statements of Comprehensive Income - GAS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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
Comprehensive Income	3,966	3,595	2,551
Southern Company Gas
Net Income	615	572	539
Qualifying hedges:
Changes in fair value, net of tax	(45)	13	17
Reclassification adjustment for amounts included in net income, net of tax	46	(24)	(11)
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	(15)	18	40
Reclassification adjustment for amounts included in net income, net of tax	(1)	0	0
Total other comprehensive income (loss)	(15)	7	46
Comprehensive Income	$ 600	$ 579	$ 585