Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)			$ (7)	$ 6
Southern Company [Member]
Net Income (loss)	$ 970	$ 735	2,138	1,731
Qualifying hedges:
Changes in fair value, net of tax	(18)	0	(16)	0
Reclassification adjustment for amounts included in net income, net of tax	1	1	4	4
Pension and other post retirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	2	1	5	2
Total other comprehensive income (loss)	(15)	2	(7)	6
Dividends on preferred and preference stock of subsidiaries	(11)	(17)	(42)	(51)
Comprehensive Income (Loss)	944	720	2,089	1,686
Alabama Power [Member]
Net Income (loss)	299	292	686	672
Qualifying hedges:
Changes in fair value, net of tax	(6)	0	(6)	0
Reclassification adjustment for amounts included in net income, net of tax	0	0	1	1
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	(6)	0	(5)	1
Dividends on preferred and preference stock of subsidiaries	(4)	(10)	(21)	(30)
Comprehensive Income (Loss)	293	292	681	673
Georgia Power [Member]
Net Income (loss)	555	529	1,077	1,115
Qualifying hedges:
Changes in fair value, net of tax	(11)	0	(10)	0
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)	(10)	0	(8)	1
Dividends on preferred and preference stock of subsidiaries	(4)	(4)	(13)	(13)
Comprehensive Income (Loss)	545	529	1,069	1,116
Gulf Power [Member]
Net Income (loss)	50	49	127	124
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	0	0	0	0
Dividends on preferred and preference stock of subsidiaries	(2)	(2)	(7)	(7)
Comprehensive Income (Loss)	50	49	127	124
Mississippi Power [Member]
Net Income (loss)	(21)	(195)	63	(303)
Qualifying hedges:
Reclassification adjustment for amounts included in net income, net of tax	0	0	1	0
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	0	0	1	0
Dividends on preferred and preference stock of subsidiaries	0	0	(1)	(2)
Comprehensive Income (Loss)	(21)	(195)	64	(303)
Southern Power [Member]
Net Income (loss)	111	65	196	132
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	0	0	0	0
Less: Comprehensive income attributable to noncontrolling interest/Dividends on preferred and preference stock of subsidiaries	9	1	15	4
Comprehensive Income (Loss)	$ 102	$ 64	$ 181	$ 128