Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Southern Company [Member]
Operating Activities:
Net income (loss)	$ 1,169	$ 996
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	1,171	1,182
Deferred income taxes	783	46
Allowance for equity funds used during construction	(102)	(119)
Stock based compensation expense	66	40
Estimated loss on Kemper IGCC	32	380
Income taxes receivable, non-current	(444)	0
Other, net	(6)	23
Changes in certain current assets and liabilities —
-Receivables	(158)	(579)
-Fossil fuel stock	136	419
-Materials and supplies	(21)	(20)
-Other current assets	(78)	(88)
-Accounts payable	(311)	(231)
-Accrued taxes	(60)	72
-Accrued compensation	(269)	(40)
-Mirror CWIP	82	67
-Other current liabilities	117	(78)
Net cash provided from operating activities	2,107	2,070
Investing Activities:
Property additions	(2,647)	(2,692)
Nuclear decommissioning trust fund purchases	(933)	(445)
Nuclear decommissioning trust fund sales	928	443
Cost of removal, net of salvage	(87)	(54)
Change in construction payables	56	89
Prepaid long-term service agreement	(110)	(93)
Other investing activities	27	(17)
Net cash used for investing activities	(2,766)	(2,769)
Financing Activities:
Increase (decrease) in notes payable, net	184	339
Proceeds —
Long-term debt issuances	3,075	1,314
Interest-bearing refundable deposit	0	75
Common stock issuances	116	318
Short-term borrowings	320	0
Redemptions and repurchases—
Long-term debt	(939)	(431)
Interest-bearing refundable deposits	(275)	0
Preferred and preference stock	(412)	0
Common stock	(115)	(5)
Short-term borrowings	(250)	0
Payment of common stock dividends	(972)	(920)
Payment of dividends on preferred and preference stock of subsidiaries	(36)	(34)
Other financing activities	66	(33)
Net cash provided from (used for) financing activities	762	623
Net Change in Cash and Cash Equivalents	103	(76)
Cash and Cash Equivalents at Beginning of Period	710	659
Cash and Cash Equivalents at End of Period	813	583
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	374	365
Income taxes, net	(16)	212
Noncash transactions - Accrued property additions at end of period	345	509
Alabama Power [Member]
Operating Activities:
Net income (loss)	386	380
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	387	416
Deferred income taxes	60	49
Allowance for equity funds used during construction	(29)	(21)
Other, net	(23)	(40)
Changes in certain current assets and liabilities —
-Receivables	(115)	(120)
-Fossil fuel stock	19	94
-Materials and supplies	3	(2)
-Other current assets	(55)	(57)
-Accounts payable	(212)	(94)
-Accrued taxes	177	104
-Accrued compensation	(66)	(17)
-Retail fuel cost over recovery - short-term	25	(23)
-Other current liabilities	40	5
Net cash provided from operating activities	597	674
Investing Activities:
Property additions	(612)	(637)
Nuclear decommissioning trust fund purchases	(278)	(121)
Nuclear decommissioning trust fund sales	278	121
Cost of removal, net of salvage	(28)	(30)
Change in construction payables	28	71
Other investing activities	(14)	(13)
Net cash used for investing activities	(626)	(609)
Financing Activities:
Increase (decrease) in notes payable, net	0	27
Proceeds —
Senior notes issuances	975	0
Capital contributions from parent company	10	12
Pollution control revenue bond	80	0
Redemptions and repurchases—
Preferred and preference stock	(412)	0
Pollution control revenue bond	(134)	0
Senior notes	(250)	0
Payment of preferred and preference stock dividends	(22)	(20)
Payment of common stock dividends	(286)	(275)
Other financing activities	(10)	1
Net cash provided from (used for) financing activities	(49)	(255)
Net Change in Cash and Cash Equivalents	(78)	(190)
Cash and Cash Equivalents at Beginning of Period	273	295
Cash and Cash Equivalents at End of Period	195	105
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	118	114
Income taxes, net	47	141
Noncash transactions - Accrued property additions at end of period	35	89
Georgia Power [Member]
Operating Activities:
Net income (loss)	522	586
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	512	503
Deferred income taxes	(6)	121
Allowance for equity funds used during construction	(10)	(16)
Retail fuel cost over recovery — long-term	0	(44)
Deferred expenses	28	31
Contract Amendment	(118)	0
Other, net	0	(12)
Changes in certain current assets and liabilities —
-Receivables	(21)	(353)
-Fossil fuel stock	101	255
-Prepaid income taxes	86	(7)
-Other current assets	(38)	(14)
-Accounts payable	(110)	(140)
-Accrued taxes	(125)	(65)
-Accrued compensation	(61)	(15)
-Retail fuel cost over recovery - short-term	0	(14)
-Other current liabilities	14	27
Net cash provided from operating activities	774	843
Investing Activities:
Property additions	(853)	(906)
Nuclear decommissioning trust fund purchases	(655)	(324)
Nuclear decommissioning trust fund sales	649	322
Change in construction payables, net of joint owner portion	26	52
Prepaid long-term service agreement	(40)	(47)
Other investing activities	(18)	(14)
Net cash used for investing activities	(891)	(917)
Financing Activities:
Increase (decrease) in notes payable, net	44	(359)
Proceeds —
Capital contributions from parent company	23	24
Pollution control revenue bond	170	0
FFB loan	600	1,000
Short-term borrowings	250	0
Redemptions and repurchases—
Pollution control revenue bond	(65)	(37)
Senior notes	(125)	0
Short-term borrowings	(250)	0
Payment of preferred and preference stock dividends	(9)	(9)
Payment of common stock dividends	(517)	(477)
FFB loan issuance costs	0	(49)
Other financing activities	(4)	(3)
Net cash provided from (used for) financing activities	117	90
Net Change in Cash and Cash Equivalents	0	16
Cash and Cash Equivalents at Beginning of Period	24	30
Cash and Cash Equivalents at End of Period	24	46
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	170	157
Income taxes, net	240	145
Noncash transactions - Accrued property additions at end of period	171	267
Gulf Power [Member]
Operating Activities:
Net income (loss)	77	75
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	64	75
Deferred income taxes	40	20
Allowance for equity funds used during construction	(8)	(5)
Other, net	11	1
Changes in certain current assets and liabilities —
-Receivables	(15)	(57)
-Fossil fuel stock	6	39
-Prepaid income taxes	12	9
-Other current assets	1	2
-Accounts payable	(9)	1
-Accrued taxes	15	12
-Accrued compensation	(10)	0
-Over recovered regulatory clause revenues	0	9
-Other current liabilities	(1)	(4)
Net cash provided from operating activities	183	177
Investing Activities:
Property additions	(148)	(159)
Cost of removal, net of salvage	(7)	(6)
Other investing activities	(19)	(5)
Net cash used for investing activities	(174)	(170)
Financing Activities:
Increase (decrease) in notes payable, net	4	3
Proceeds —
Common stock issuances	20	50
Pollution control revenue bond	0	42
Short-term borrowings	40	0
Redemptions and repurchases—
Pollution control revenue bond	0	(29)
Payment of preferred and preference stock dividends	(5)	(5)
Payment of common stock dividends	(65)	(62)
Other financing activities	2	2
Net cash provided from (used for) financing activities	(4)	1
Net Change in Cash and Cash Equivalents	5	8
Cash and Cash Equivalents at Beginning of Period	39	22
Cash and Cash Equivalents at End of Period	44	30
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	26	26
Income taxes, net	(9)	17
Noncash transactions - Accrued property additions at end of period	28	31
Mississippi Power [Member]
Operating Activities:
Net income (loss)	85	(109)
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	55	50
Deferred income taxes	694	(108)
Investment tax credits	32	28
Allowance for equity funds used during construction	(53)	(75)
Regulatory assets associated with Kemper IGCC	(50)	(26)
Estimated loss on Kemper IGCC	32	380
Income taxes receivable, non-current	(544)	0
Other, net	8	7
Changes in certain current assets and liabilities —
-Receivables	6	(32)
-Fossil fuel stock	5	32
-Prepaid income taxes	24	(12)
-Other current assets	(7)	(5)
-Accounts payable	(25)	4
-Accrued taxes	(51)	(23)
-Accrued interest	(7)	13
-Accrued compensation	(12)	4
-Over recovered regulatory clause revenues	32	(18)
-Mirror CWIP	82	67
-Other current liabilities	3	1
Net cash provided from operating activities	309	178
Investing Activities:
Property additions	(428)	(692)
Change in construction payables	(15)	(28)
Other investing activities	(17)	(13)
Net cash used for investing activities	(460)	(733)
Financing Activities:
Increase (decrease) in notes payable, net	475	0
Proceeds —
Capital contributions from parent company	77	211
Bonds — Other	0	12
Interest-bearing refundable deposit	0	75
Long-term debt issuance to parent company	0	220
Other long-term debt issuances	0	250
Short-term borrowings	30	0
Redemptions and repurchases—
Other long-term debt	(350)	0
Payment of preferred and preference stock dividends	(1)	(1)
Return of capital	0	(110)
Other financing activities	(1)	(1)
Net cash provided from (used for) financing activities	230	656
Net Change in Cash and Cash Equivalents	79	101
Cash and Cash Equivalents at Beginning of Period	133	145
Cash and Cash Equivalents at End of Period	212	246
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	2	8
Income taxes, net	(181)	(34)
Noncash transactions - Accrued property additions at end of period	99	136
Issuance of promissory note to parent related to repayment of interest-bearing refundable deposit and accrued interest	301	0
Southern Power [Member]
Operating Activities:
Net income (loss)	85	66
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	121	105
Deferred income taxes	59	(3)
Investment tax credits	153	26
Amortization of investment tax credits	(10)	(5)
Deferred revenues	(21)	(24)
Accrued income taxes, non-current	100	0
Other, net	10	7
Changes in certain current assets and liabilities —
-Receivables	(26)	(34)
-Fossil fuel stock	5	(1)
-Prepaid income taxes	(102)	21
-Other current assets	0	(1)
-Accounts payable	(31)	24
-Accrued taxes	(110)	7
-Other current liabilities	18	5
Net cash provided from operating activities	251	193
Investing Activities:
Plant acquisitions	(408)	(213)
Property additions	(154)	(11)
Change in construction payables	38	(3)
Payments pursuant to long-term service agreements	(45)	(23)
Other investing activities	(1)	(11)
Net cash used for investing activities	(570)	(261)
Financing Activities:
Increase (decrease) in notes payable, net	(195)	73
Proceeds —
Senior notes issuances	650	0
Redemptions and repurchases—
Distributions to noncontrolling interests	(1)	0
Contributions from noncontrolling interests	78	7
Payment of common stock dividends	(65)	(66)
Other financing activities	(3)	9
Net cash provided from (used for) financing activities	464	23
Net Change in Cash and Cash Equivalents	145	(45)
Cash and Cash Equivalents at Beginning of Period	75	69
Cash and Cash Equivalents at End of Period	220	24
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	35	43
Income taxes, net	(72)	(59)
Noncash transactions - Accrued property additions at end of period	$ 38	$ 5