Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Income (loss)	$ 636	$ 643	$ 1,133	$ 1,169
Qualifying hedges:
Changes in fair value, net of tax	(20)	19	(137)	1
Reclassification adjustment for amounts included in net income, net of tax	16	2	18	3
Pension and other post retirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	1	1	2	3
Total other comprehensive income (loss)	(3)	22	(117)	7
Dividends on preferred and preference stock of subsidiaries	12	14	23	31
Comprehensive income attributable to noncontrolling interests	12	0	13	0
Comprehensive Income (Loss)	609	651	980	1,145
Alabama Power [Member]
Net Income (loss)	216	207	376	386
Qualifying hedges:
Changes in fair value, net of tax	0	5	(2)	1
Reclassification adjustment for amounts included in net income, net of tax	1	0	2	1
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	1	5	0	2
Dividends on preferred and preference stock of subsidiaries	5	7	9	17
Comprehensive Income (Loss)	217	212	376	388
Georgia Power [Member]
Net Income (loss)	352	282	625	522
Qualifying hedges:
Changes in fair value, net of tax	0	14	0	0
Reclassification adjustment for amounts included in net income, net of tax	1	1	1	1
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	1	15	1	1
Dividends on preferred and preference stock of subsidiaries	5	5	9	9
Comprehensive Income (Loss)	353	297	626	523
Gulf Power [Member]
Net Income (loss)	37	38	68	77
Qualifying hedges:
Changes in fair value, net of tax	(1)	0	(4)	0
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	(1)	0	(4)	0
Dividends on preferred and preference stock of subsidiaries	3	3	5	5
Comprehensive Income (Loss)	36	38	64	77
Mississippi Power [Member]
Net Income (loss)	3	50	14	85
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	0	0	0	0
Dividends on preferred and preference stock of subsidiaries	1	1	1	1
Comprehensive Income (Loss)	3	50	14	85
Southern Power [Member]
Net Income (loss)	101	52	152	85
Qualifying hedges:
Changes in fair value, net of tax	(24)	0	(24)	0
Reclassification adjustment for amounts included in net income, net of tax	13	0	14	0
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	(11)	0	(10)	0
Comprehensive income attributable to noncontrolling interests	12	6	13	6
Comprehensive Income (Loss)	$ 78	$ 46	$ 129	$ 79