Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	$ (15)	$ 2
Southern Company [Member]
Net Income (loss)	525	368
Qualifying hedges:
Changes in fair value, net of tax	(18)	0
Reclassification adjustment for amounts included in net income, net of tax	1	1
Pension and other post retirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	2	1
Total other comprehensive income (loss)	(15)	2
Dividends on preferred and preference stock of subsidiaries	(17)	(17)
Comprehensive Income (Loss)	493	353
Alabama Power [Member]
Net Income (loss)	179	197
Qualifying hedges:
Changes in fair value, net of tax	(4)	0
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	(4)	0
Dividends on preferred and preference stock of subsidiaries	(10)	(10)
Comprehensive Income (Loss)	175	197
Georgia Power [Member]
Net Income (loss)	240	270
Qualifying hedges:
Changes in fair value, net of tax	(14)	0
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	(14)	0
Dividends on preferred and preference stock of subsidiaries	(4)	(4)
Comprehensive Income (Loss)	226	270
Gulf Power [Member]
Net Income (loss)	39	39
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	0	0
Dividends on preferred and preference stock of subsidiaries	(2)	(2)
Comprehensive Income (Loss)	39	39
Mississippi Power [Member]
Net Income (loss)	35	(172)
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	0	0
Dividends on preferred and preference stock of subsidiaries	0	0
Comprehensive Income (Loss)	35	(172)
Southern Power [Member]
Net Income (loss)	33	34
Pension and other post retirement benefit plans:
Total other comprehensive income (loss)	0	0
Less: Comprehensive income attributable to noncontrolling interest/Dividends on preferred and preference stock of subsidiaries	0	1
Comprehensive Income (Loss)	$ 33	$ 33