Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income	$ 1,107	$ 841
Qualifying hedges:
Changes in fair value, net of tax	(30)	(86)
Reclassification adjustment for amounts included in net income, net of tax	55	38
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	3	1
Total other comprehensive income (loss)	28	(47)
Comprehensive Income	1,135	794
Dividends on preferred stock of subsidiaries	4	4
Comprehensive loss attributable to noncontrolling interests	(32)	(31)
Comprehensive Income (Loss) Attributable to Parent	1,163	821
ALABAMA POWER CO
Net income	363	284
Qualifying hedges:
Reclassification adjustment for amounts included in net income, net of tax	1	1
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	1	1
Comprehensive Income	364	285
Dividends on preferred stock of subsidiaries	4	4
GEORGIA POWER CO
Net income	351	331
Qualifying hedges:
Changes in fair value, net of tax	0	(2)
Reclassification adjustment for amounts included in net income, net of tax	2	1
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	2	(1)
Comprehensive Income	353	330
MISSISSIPPI POWER CO
Net income	45	32
Pension and other postretirement benefit plans:
Comprehensive Income	45	32
SOUTHERN POWER CO
Net income	65	44
Qualifying hedges:
Changes in fair value, net of tax	(33)	(62)
Reclassification adjustment for amounts included in net income, net of tax	48	28
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	1	1
Total other comprehensive income (loss)	16	(33)
Comprehensive Income	81	11
Comprehensive loss attributable to noncontrolling interests	(32)	(31)
Comprehensive Income (Loss) Attributable to Parent	113	42
SOUTHERN Co GAS
Net income	398	275
Qualifying hedges:
Changes in fair value, net of tax	1	(20)
Reclassification adjustment for amounts included in net income, net of tax	3	5
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	4	(15)
Comprehensive Income	$ 402	$ 260