Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income (loss)	$ 1,168	$ 970	$ 2,299	$ 2,138
Qualifying hedges:
Changes in fair value, net of tax	19	(18)	(118)	(16)
Reclassification adjustment for amounts included in net income, net of tax	2	1	20	4
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	1	2	3	5
Total other comprehensive income (loss)	22	(15)	(95)	(7)
Dividends on preferred and preference stock of subsidiaries	11	11	34	42
Comprehensive income attributable to noncontrolling interests	27	0	39	0
Comprehensive Income (Loss)	1,152	944	2,131	2,089
Alabama Power [Member]
Net Income (loss)	354	299	730	686
Qualifying hedges:
Changes in fair value, net of tax	0	(6)	(2)	(6)
Reclassification adjustment for amounts included in net income, net of tax	1	0	3	1
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	1	(6)	1	(5)
Dividends on preferred and preference stock of subsidiaries	4	4	13	21
Comprehensive Income (Loss)	355	293	731	681
Georgia Power [Member]
Net Income (loss)	602	555	1,227	1,077
Qualifying hedges:
Changes in fair value, net of tax	0	(11)	0	(10)
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	(10)	2	(8)
Dividends on preferred and preference stock of subsidiaries	4	4	13	13
Comprehensive Income (Loss)	603	545	1,229	1,069
Gulf Power [Member]
Net Income (loss)	47	50	115	127
Qualifying hedges:
Changes in fair value, net of tax	0	0	(4)	0
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	0	0	(4)	0
Dividends on preferred and preference stock of subsidiaries	2	2	7	7
Comprehensive Income (Loss)	47	50	111	127
Mississippi Power [Member]
Net Income (loss)	26	(21)	40	63
Qualifying hedges:
Changes in fair value, net of tax	0	0	(1)	0
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	0	1
Dividends on preferred and preference stock of subsidiaries	0	0	1	1
Comprehensive Income (Loss)	26	(21)	40	64
Southern Power [Member]
Net Income (loss)	203	111	354	196
Qualifying hedges:
Changes in fair value, net of tax	23	0	(1)	0
Reclassification adjustment for amounts included in net income, net of tax	(1)	0	13	0
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	22	0	12	0
Comprehensive income attributable to noncontrolling interests	27	9	39	15
Comprehensive Income (Loss)	$ 198	$ 102	$ 327	$ 181