Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Income	$ (1,348)	$ 647	$ (684)	$ 1,148
Qualifying hedges:
Changes in fair value, net of tax	38	(20)	29	(137)
Reclassification adjustment for amounts included in net income, net of tax	(41)	16	(42)	18
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	1	1	2	2
Total other comprehensive income (loss)	(2)	(3)	(11)	(117)
Comprehensive Income (Loss)	(1,350)	644	(695)	1,031
Dividends on preferred and preference stock of subsidiaries	11	12	22	23
Comprehensive income attributable to noncontrolling interests	22	12	17	13
Comprehensive Income (Loss) Attributable to Parent	(1,383)	620	(734)	995
ALABAMA POWER CO
Net Income	235	218	412	379
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	2	2
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	1	1	2	0
Comprehensive Income (Loss)	236	219	414	379
Dividends on preferred and preference stock of subsidiaries	5	5	9	9
GEORGIA POWER CO
Net Income	352	354	616	627
Qualifying hedges:
Reclassification adjustment for amounts included in net income, net of tax	1	1	2	1
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	1	1	2	1
Comprehensive Income (Loss)	353	355	618	628
Dividends on preferred and preference stock of subsidiaries	5	5	9	9
GULF POWER CO
Net Income	37	37	57	68
Qualifying hedges:
Changes in fair value, net of tax	(1)	(1)	(1)	(4)
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	(1)	(1)	(1)	(4)
Comprehensive Income (Loss)	36	36	56	64
Dividends on preferred and preference stock of subsidiaries	2	3	4	5
MISSISSIPPI POWER CO
Net Income	(2,053)	3	(2,073)	14
Qualifying hedges:
Changes in fair value, net of tax	0	0	1	0
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	0	0	1	0
Comprehensive Income (Loss)	(2,053)	3	(2,072)	14
Dividends on preferred and preference stock of subsidiaries	1	1	1	1
SOUTHERN POWER CO
Net Income	104	101	168	152
Qualifying hedges:
Changes in fair value, net of tax	40	(24)	32	(24)
Reclassification adjustment for amounts included in net income, net of tax	(45)	13	(48)	14
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	(5)	(11)	(16)	(10)
Comprehensive Income (Loss)	99	90	152	142
Comprehensive income attributable to noncontrolling interests	22	12	17	13
Comprehensive Income (Loss) Attributable to Parent	77	78	135	129
SOUTHERN Co GAS
Net Income	49		288
Qualifying hedges:
Changes in fair value, net of tax	(1)		(2)
Reclassification adjustment for amounts included in net income, net of tax	0		0
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0		(1)
Total other comprehensive income (loss)	(1)		(3)
Comprehensive Income (Loss)	48		285
Comprehensive income attributable to noncontrolling interests	0		0
Comprehensive Income (Loss) Attributable to Parent	$ 48		$ 285
Predecessor | SOUTHERN Co GAS
Net Income		(48)		145
Qualifying hedges:
Changes in fair value, net of tax		(12)		(41)
Reclassification adjustment for amounts included in net income, net of tax		2		1
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax		2		5
Total other comprehensive income (loss)		(8)		(35)
Comprehensive Income (Loss)		(56)		110
Comprehensive income attributable to noncontrolling interests		3		14
Comprehensive Income (Loss) Attributable to Parent		$ (59)		$ 96