Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income (loss)	$ 931	$ (127)	$ 2,989	$ 809
Qualifying hedges:
Changes in fair value, net of tax	(32)	(54)	(60)	(8)
Reclassification adjustment for amounts included in net income, net of tax	(3)	64	24	45
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	2	1	4
Total other comprehensive income (loss)	(35)	12	(35)	41
Comprehensive Income (Loss)	896	(115)	2,954	850
Dividends on preferred stock of subsidiaries	3	4	7	8
Comprehensive income attributable to noncontrolling interests	29	23	0	17
Comprehensive Income (Loss) Attributable to Parent	864	(142)	2,947	825
ALABAMA POWER CO
Net income (loss)	299	262	520	491
Qualifying hedges:
Reclassification adjustment for amounts included in net income, net of tax	1	1	2	2
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	1	1	2	2
Comprehensive Income (Loss)	300	263	522	493
Dividends on preferred stock of subsidiaries	3	3	7	7
GEORGIA POWER CO
Net income (loss)	448	(396)	759	(44)
Qualifying hedges:
Changes in fair value, net of tax	(28)	0	(28)	0
Reclassification adjustment for amounts included in net income, net of tax	1	1	1	2
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	(27)	1	(27)	2
Comprehensive Income (Loss)	421	(395)	732	(42)
MISSISSIPPI POWER CO
Net income (loss)	37	47	74	40
Qualifying hedges:
Changes in fair value, net of tax	0	0	0	(1)
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	0
Comprehensive Income (Loss)	37	47	75	40
Dividends on preferred stock of subsidiaries	0	1	0	1
SOUTHERN POWER CO
Net income (loss)	203	45	230	160
Qualifying hedges:
Changes in fair value, net of tax	(1)	(55)	(30)	(8)
Reclassification adjustment for amounts included in net income, net of tax	(7)	59	17	35
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	0	0	1
Total other comprehensive income (loss)	(8)	4	(13)	28
Comprehensive Income (Loss)	195	49	217	188
Comprehensive income attributable to noncontrolling interests	29	23	0	17
Comprehensive Income (Loss) Attributable to Parent	166	26	217	171
SOUTHERN Co GAS
Net income (loss)	106	(31)	376	248
Qualifying hedges:
Changes in fair value, net of tax	(3)	1	(3)	1
Reclassification adjustment for amounts included in net income, net of tax	0	0	0	2
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	0	(1)	0
Total other comprehensive income (loss)	(3)	1	(4)	3
Comprehensive Income (Loss)	$ 103	$ (30)	$ 372	$ 251