Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Southern Company [Member]
Operating Activities:
Net income (loss)	$ 525	$ 368
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	578	587
Deferred income taxes	113	(37)
Allowance for equity funds used during construction	(63)	(57)
Stock based compensation expense	56	28
Estimated loss on Kemper IGCC	9	380
Other, net	4	(42)
Changes in certain current assets and liabilities --
-Receivables	180	(128)
-Fossil fuel stock	76	441
-Materials and supplies	4	(5)
-Other current assets	(89)	(114)
-Accounts payable	(426)	(109)
-Accrued taxes	197	(44)
-Accrued compensation	(381)	(144)
-Mirror CWIP	40	34
-Other current liabilities	90	(55)
Net cash provided from operating activities	913	1,103
Investing Activities:
Property additions	(1,097)	(1,180)
Distribution of restricted cash	0	9
Nuclear decommissioning trust fund purchases	(290)	(231)
Nuclear decommissioning trust fund sales	284	229
Cost of removal, net of salvage	(36)	(22)
Change in construction payables	65	51
Prepaid long-term service agreement	(37)	(64)
Other investing activities	4	(7)
Net cash used for investing activities	(1,107)	(1,215)
Financing Activities:
Increase (decrease) in notes payable, net	597	(884)
Proceeds --
Long-term debt issuances	550	1,251
Interest-bearing refundable deposit	0	75
Common stock issuances	112	128
Short-term borrowings	280	0
Redemptions --
Long-term debt	(333)	(9)
Common stock repurchased	(115)	(4)
Payment of common stock dividends	(478)	(451)
Payment of dividends on preferred and preference stock of subsidiaries	(17)	(17)
Other financing activities	0	(46)
Net cash provided from (used for) financing activities	596	43
Net Change in Cash and Cash Equivalents	402	(69)
Cash and Cash Equivalents at Beginning of Period	710	659
Cash and Cash Equivalents at End of Period	1,112	590
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	207	186
Income taxes, net	(289)	(7)
Noncash transactions - Accrued property additions at end of period	347	450
Alabama Power [Member]
Operating Activities:
Net income (loss)	179	197
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	196	210
Deferred income taxes	16	25
Allowance for equity funds used during construction	(15)	(10)
Other, net	2	(22)
Changes in certain current assets and liabilities --
-Receivables	(3)	(17)
-Fossil fuel stock	0	99
-Materials and supplies	12	3
-Other current assets	(80)	(81)
-Accounts payable	(229)	(139)
-Accrued taxes	246	147
-Accrued compensation	(89)	(37)
-Retail fuel cost over recovery - short-term	34	(20)
-Other current liabilities	21	(3)
Net cash provided from operating activities	290	352
Investing Activities:
Property additions	(325)	(287)
Nuclear decommissioning trust fund purchases	(129)	(56)
Nuclear decommissioning trust fund sales	129	56
Cost of removal, net of salvage	(13)	(12)
Change in construction payables	34	49
Other investing activities	(9)	(5)
Net cash used for investing activities	(313)	(255)
Proceeds --
Senior notes issuances	550	0
Capital contributions from parent company	6	7
Redemptions --
Senior notes	(250)	0
Payment of preferred and preference stock dividends	(10)	(10)
Payment of common stock dividends	(143)	(137)
Other financing activities	(8)	0
Net cash provided from (used for) financing activities	145	(140)
Net Change in Cash and Cash Equivalents	122	(43)
Cash and Cash Equivalents at Beginning of Period	273	295
Cash and Cash Equivalents at End of Period	395	252
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	68	61
Income taxes, net	(136)	(28)
Noncash transactions - Accrued property additions at end of period	41	66
Georgia Power [Member]
Operating Activities:
Net income (loss)	240	270
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	256	250
Deferred income taxes	(7)	96
Allowance for equity funds used during construction	(15)	(6)
Retail fuel cost over recovery - long-term	0	(44)
Deferred expenses	33	33
Pension, postretirement, and other employee benefits	6	(4)
Other, net	(2)	(10)
Changes in certain current assets and liabilities --
-Receivables	166	(83)
-Fossil fuel stock	67	257
-Prepaid income taxes	170	(11)
-Other current assets	(13)	(12)
-Accounts payable	(261)	(28)
-Accrued taxes	(217)	(166)
-Accrued compensation	(81)	(38)
-Retail fuel cost over recovery - short-term	0	(14)
-Other current liabilities	21	9
Net cash provided from operating activities	363	499
Investing Activities:
Property additions	(422)	(460)
Nuclear decommissioning trust fund purchases	(161)	(175)
Nuclear decommissioning trust fund sales	155	173
Change in construction payables, net of joint owner portion	37	28
Prepaid long-term service agreement	(9)	(44)
Other investing activities	(5)	(2)
Net cash used for investing activities	(405)	(480)
Financing Activities:
Increase (decrease) in notes payable, net	434	(749)
Proceeds --
Capital contributions from parent company	11	12
FFB loan	0	1,000
Short-term borrowings	250	0
Redemptions --
Payment of preferred and preference stock dividends	(4)	(4)
Payment of common stock dividends	(259)	(238)
FFB loan issuance costs	0	(49)
Other financing activities	(1)	(3)
Net cash provided from (used for) financing activities	431	(31)
Net Change in Cash and Cash Equivalents	389	(12)
Cash and Cash Equivalents at Beginning of Period	24	30
Cash and Cash Equivalents at End of Period	413	18
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	79	71
Income taxes, net	(34)	11
Noncash transactions - Accrued property additions at end of period	177	229
Gulf Power [Member]
Operating Activities:
Net income (loss)	39	39
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	22	34
Deferred income taxes	27	14
Allowance for equity funds used during construction	(4)	(2)
Other, net	11	2
Changes in certain current assets and liabilities --
-Receivables	12	(25)
-Fossil fuel stock	(2)	46
-Prepaid income taxes	3	10
-Other current assets	2	1
-Accounts payable	(28)	6
-Accrued taxes	5	9
-Accrued compensation	(16)	(5)
-Other current liabilities	10	13
Net cash provided from operating activities	81	142
Investing Activities:
Property additions	(84)	(79)
Cost of removal, net of salvage	(5)	(3)
Other investing activities	(3)	(1)
Net cash used for investing activities	(92)	(83)
Financing Activities:
Increase (decrease) in notes payable, net	40	(75)
Proceeds --
Common stock issuances	20	50
Redemptions --
Payment of preferred and preference stock dividends	(2)	(2)
Payment of common stock dividends	(33)	(31)
Other financing activities	2	0
Net cash provided from (used for) financing activities	27	(58)
Net Change in Cash and Cash Equivalents	16	1
Cash and Cash Equivalents at Beginning of Period	39	22
Cash and Cash Equivalents at End of Period	55	23
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	3	5
Income taxes, net	(8)	(6)
Noncash transactions - Accrued property additions at end of period	41	33
Mississippi Power [Member]
Operating Activities:
Net income (loss)	35	(172)
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	26	24
Deferred income taxes	141	(124)
Allowance for equity funds used during construction	(28)	(38)
Regulatory assets associated with Kemper IGCC	(27)	(13)
Estimated loss on Kemper IGCC	9	380
Other, net	11	8
Changes in certain current assets and liabilities --
-Receivables	17	(14)
-Fossil fuel stock	4	37
-Prepaid income taxes	44	(33)
-Other current assets	(3)	(5)
-Accounts payable	(22)	15
-Accrued taxes	(54)	(55)
-Accrued interest	9	8
-Accrued compensation	(20)	(2)
-Over recovered regulatory clause revenues	22	(18)
-Mirror CWIP	40	34
Net cash provided from operating activities	204	32
Investing Activities:
Property additions	(213)	(324)
Change in construction payables	(14)	(31)
Other investing activities	(6)	(6)
Net cash used for investing activities	(233)	(361)
Proceeds --
Capital contributions from parent company	76	1
Interest-bearing refundable deposit	0	75
Other long-term debt issuances	0	250
Short-term borrowings	30	0
Redemptions --
Other long-term debt	(75)	0
Payment of preferred and preference stock dividends	0	0
Return of capital	0	(55)
Other financing activities	(1)	(2)
Net cash provided from (used for) financing activities	30	269
Net Change in Cash and Cash Equivalents	1	(60)
Cash and Cash Equivalents at Beginning of Period	133	145
Cash and Cash Equivalents at End of Period	134	85
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	(1)	3
Income taxes, net	(180)	26
Noncash transactions - Accrued property additions at end of period	100	132
Southern Power [Member]
Operating Activities:
Net income (loss)	33	34
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	60	53
Deferred income taxes	(54)	(14)
Investment tax credits	0	26
Amortization of investment tax credits	(4)	(2)
Deferred revenues	(20)	(20)
Other, net	3	3
Changes in certain current assets and liabilities --
-Receivables	2	21
-Fossil fuel stock	6	2
-Prepaid income taxes	(2)	15
-Other current assets	0	(1)
-Accounts payable	(25)	2
-Accrued taxes	(4)	6
-Accrued interest	(15)	(15)
-Other current liabilities	1	0
Net cash provided from operating activities	(19)	110
Investing Activities:
Property additions	(38)	(5)
Change in construction payables	17	1
Payments pursuant to long-term service agreements	(16)	(10)
Other investing activities	(1)	(1)
Net cash used for investing activities	(38)	(15)
Financing Activities:
Increase (decrease) in notes payable, net	38	0
Redemptions --
Payment of common stock dividends	(33)	(33)
Other financing activities	0	(2)
Net cash provided from (used for) financing activities	5	(35)
Net Change in Cash and Cash Equivalents	(52)	60
Cash and Cash Equivalents at Beginning of Period	75	69
Cash and Cash Equivalents at End of Period	23	129
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	36	36
Income taxes, net	79	(44)
Noncash transactions - Accrued property additions at end of period	$ 16	$ 5