Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income (loss)	$ 1,110	$ 1,283	$ 2,592	$ 2,746
Qualifying hedges:
Changes in fair value, net of tax	1	49	(15)	(26)
Reclassification adjustment for amounts included in net income, net of tax	31	(32)	81	(3)
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	4	3	10	6
Total other comprehensive income (loss)	36	20	76	(23)
Comprehensive Income	1,146	1,303	2,668	2,723
Dividends on preferred stock of subsidiaries	4	4	11	11
Comprehensive income (loss) attributable to noncontrolling interests	5	28	(27)	3
Comprehensive Income (Loss) Attributable to Parent	1,137	1,271	2,684	2,709
ALABAMA POWER CO
Net income (loss)	503	448	1,200	1,033
Qualifying hedges:
Changes in fair value, net of tax	4	0	3	0
Reclassification adjustment for amounts included in net income, net of tax	1	1	3	3
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	5	1	6	3
Comprehensive Income	508	449	1,206	1,036
Dividends on preferred stock of subsidiaries	4	4	11	11
GEORGIA POWER CO
Net income (loss)	536	773	1,030	1,411
Qualifying hedges:
Changes in fair value, net of tax	0	0	0	(2)
Reclassification adjustment for amounts included in net income, net of tax	2	2	5	4
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	2	2	5	2
Comprehensive Income	538	775	1,035	1,413
MISSISSIPPI POWER CO
Net income (loss)	50	67	133	138
Qualifying hedges:
Reclassification adjustment for amounts included in net income, net of tax	0	0	1	1
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	0	0	1	1
Comprehensive Income	50	67	134	139
SOUTHERN POWER CO
Net income (loss)	83	102	184	215
Qualifying hedges:
Changes in fair value, net of tax	(21)	44	(48)	(6)
Reclassification adjustment for amounts included in net income, net of tax	27	(36)	66	(24)
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	1	0	2	2
Total other comprehensive income (loss)	7	8	20	(28)
Comprehensive Income	90	110	204	187
Comprehensive income (loss) attributable to noncontrolling interests	5	28	(27)	3
Comprehensive Income (Loss) Attributable to Parent	85	82	231	184
SOUTHERN Co GAS
Net income (loss)	56	14	389	360
Qualifying hedges:
Changes in fair value, net of tax	23	4	32	(17)
Reclassification adjustment for amounts included in net income, net of tax	(2)	1	1	7
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	21	5	33	(10)
Comprehensive Income	$ 77	$ 19	$ 422	$ 350