Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income	$ 1,109	$ 1,177		$ 427	$ 2,324
Qualifying hedges:
Changes in fair value, net of tax	25	19		54	(118)
Reclassification adjustment for amounts included in net income, net of tax	(17)	2		(59)	20
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	1	1		3	3
Total other comprehensive income (loss)	9	22		(2)	(95)
Comprehensive Income	1,118	1,199		425	2,229
Less:
Dividends on preferred and preference stock of subsidiaries	10	11		32	34
Comprehensive income attributable to noncontrolling interests	30	27		48	39
Comprehensive Income (Loss) Attributable to Parent	1,078	1,161		345	2,156
ALABAMA POWER CO
Net Income	330	356		743	734
Qualifying hedges:
Changes in fair value, net of tax	0	0		0	(2)
Reclassification adjustment for amounts included in net income, net of tax	1	1		3	3
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	1	1		3	1
Comprehensive Income	331	357		746	735
Less:
Dividends on preferred and preference stock of subsidiaries	5	4		14	13
GEORGIA POWER CO
Net Income	584	604		1,201	1,230
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	585	605		1,203	1,232
Less:
Dividends on preferred and preference stock of subsidiaries	4	4		13	13
GULF POWER CO
Net Income	63	47		121	115
Qualifying hedges:
Changes in fair value, net of tax	0	0		(1)	(4)
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	0	0		(1)	(4)
Comprehensive Income	63	47		120	111
Less:
Dividends on preferred and preference stock of subsidiaries	0	2		4	7
MISSISSIPPI POWER CO
Net Income	40	26		(2,033)	40
Qualifying hedges:
Changes in fair value, net of tax	(1)	0		0	(1)
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)	(1)	0		1	0
Comprehensive Income	39	26		(2,032)	40
Less:
Dividends on preferred and preference stock of subsidiaries	0	0		1	1
SOUTHERN POWER CO
Net Income	154	203		324	354
Qualifying hedges:
Changes in fair value, net of tax	25	23		58	(1)
Reclassification adjustment for amounts included in net income, net of tax	(20)	(1)		(68)	13
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	5	22		(10)	12
Comprehensive Income	159	225		314	366
Less:
Comprehensive income attributable to noncontrolling interests	30	27		48	39
Comprehensive Income (Loss) Attributable to Parent	129	198		266	$ 327
SOUTHERN Co GAS
Net Income	15	4		303
Qualifying hedges:
Changes in fair value, net of tax	0	(3)		(3)
Reclassification adjustment for amounts included in net income, net of tax	0	0		0
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	0		0
Total other comprehensive income (loss)	0	(3)		(3)
Comprehensive Income	15	1		300
Less:
Comprehensive income attributable to noncontrolling interests	0	0		0
Comprehensive Income (Loss) Attributable to Parent	$ 15	$ 1		$ 300
Predecessor | SOUTHERN Co GAS
Net Income			$ 145
Qualifying hedges:
Changes in fair value, net of tax			(41)
Reclassification adjustment for amounts included in net income, net of tax			1
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax			5
Total other comprehensive income (loss)			(35)
Comprehensive Income			110
Less:
Comprehensive income attributable to noncontrolling interests			14
Comprehensive Income (Loss) Attributable to Parent			$ 96