Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss)	$ (127)	$ (1,348)	$ 809	$ (684)
Qualifying hedges:
Changes in fair value, net of tax	(54)	38	(8)	29
Reclassification adjustment for amounts included in net income, net of tax	64	(41)	45	(42)
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	2	1	4	2
Total other comprehensive income (loss)	12	(2)	41	(11)
Comprehensive Income (Loss)	(115)	(1,350)	850	(695)
Less:
Dividends on preferred and preference stock of subsidiaries	4	11	8	22
Comprehensive income attributable to noncontrolling interests	23	22	17	17
Comprehensive Income (Loss) Attributable to Parent	(142)	(1,383)	825	(734)
ALABAMA POWER CO
Net income (loss)	262	235	491	412
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)	263	236	493	414
Less:
Dividends on preferred and preference stock of subsidiaries	3	5	7	9
GEORGIA POWER CO
Net income (loss)	(396)	352	(44)	616
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)	(395)	353	(42)	618
Less:
Dividends on preferred and preference stock of subsidiaries	0	5	0	9
GULF POWER CO
Net income (loss)	42	37	84	57
Qualifying hedges:
Changes in fair value, net of tax	0	(1)	0	(1)
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	0	(1)	0	(1)
Comprehensive Income (Loss)	42	36	84	56
Less:
Dividends on preferred and preference stock of subsidiaries	0	2	0	4
MISSISSIPPI POWER CO
Net income (loss)	47	(2,053)	40	(2,073)
Qualifying hedges:
Changes in fair value, net of tax	0	0	(1)	1
Reclassification adjustment for amounts included in net income, net of tax	0	0	1	0
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	0	0	0	1
Comprehensive Income (Loss)	47	(2,053)	40	(2,072)
Less:
Dividends on preferred and preference stock of subsidiaries	1	1	1	1
SOUTHERN POWER CO
Net income (loss)	45	104	160	168
Qualifying hedges:
Changes in fair value, net of tax	(55)	40	(8)	32
Reclassification adjustment for amounts included in net income, net of tax	59	(45)	35	(48)
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)	4	(5)	28	(16)
Comprehensive Income (Loss)	49	99	188	152
Less:
Comprehensive income attributable to noncontrolling interests	23	22	17	17
Comprehensive Income (Loss) Attributable to Parent	26	77	171	135
SOUTHERN Co GAS
Net income (loss)	(31)	49	248	288
Qualifying hedges:
Changes in fair value, net of tax	1	(1)	1	(2)
Reclassification adjustment for amounts included in net income, net of tax	0	0	2	0
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)	1	(1)	3	(3)
Comprehensive Income (Loss)	$ (30)	$ 48	$ 251	$ 285