Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Southern Company [Member]
Operating Activities:
Net income (loss)	$ 1,731,000,000	$ 1,279,000,000
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	1,798,000,000	1,725,000,000
Deferred income taxes	330,000,000	263,000,000
Allowance for equity funds used during construction	(182,000,000)	(139,000,000)
Stock based compensation expense	51,000,000	48,000,000
Estimated loss on Kemper IGCC	798,000,000	1,140,000,000
Other, net	(74,000,000)	76,000,000
Changes in certain current assets and liabilities --
-Receivables	(640,000,000)	(407,000,000)
-Fossil fuel stock	522,000,000	471,000,000
-Materials and supplies	(45,000,000)	33,000,000
-Other current assets	(29,000,000)	(1,000,000)
-Accounts payable	(92,000,000)	(140,000,000)
-Accrued taxes	403,000,000	268,000,000
-Accrued compensation	96,000,000	(198,000,000)
-Other current liabilities	20,000,000	(7,000,000)
Net cash provided from operating activities	4,687,000,000	4,411,000,000
Investing Activities:
Property additions	(3,903,000,000)	(3,978,000,000)
Investment of restricted cash	(11,000,000)	(169,000,000)
Distribution of restricted cash	37,000,000	94,000,000
Nuclear decommissioning trust fund purchases	(635,000,000)	(744,000,000)
Nuclear decommissioning trust fund sales	633,000,000	742,000,000
Cost of removal, net of salvage	(106,000,000)	(90,000,000)
Prepaid long-term service agreement	(145,000,000)	(79,000,000)
Other investing activities	(27,000,000)	122,000,000
Net cash used for investing activities	(4,157,000,000)	(4,102,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(1,117,000,000)	(70,000,000)
Proceeds --
Long-term debt issuances	2,715,000,000	2,421,000,000
Interest-bearing refundable deposit	75,000,000	0
Preference stock	0	50,000,000
Common stock issuances	484,000,000	479,000,000
Redemptions --
Long-term debt	(437,000,000)	(1,767,000,000)
Common stock repurchased	(5,000,000)	(19,000,000)
Payment of common stock dividends	(1,391,000,000)	(1,314,000,000)
Payment of dividends on preferred and preference stock of subsidiaries	(51,000,000)	(49,000,000)
Other financing activities	(48,000,000)	14,000,000
Net cash provided from (used for) financing activities	225,000,000	(255,000,000)
Net Change in Cash and Cash Equivalents	755,000,000	54,000,000
Cash and Cash Equivalents at Beginning of Period	659,000,000	628,000,000
Cash and Cash Equivalents at End of Period	1,414,000,000	682,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	560,000,000	564,000,000
Income taxes, net	263,000,000	149,000,000
Noncash transactions - accrued property additions at end of period	415,000,000	539,000,000
Noncash transactions - capital lease obligation	0	83,000,000
Alabama Power [Member]
Operating Activities:
Net income (loss)	672,000,000	602,000,000
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	631,000,000	616,000,000
Deferred income taxes	68,000,000	200,000,000
Allowance for equity funds used during construction	(36,000,000)	(23,000,000)
Regulatory deferrals	(62,000,000)	(14,000,000)
Other, net	29,000,000	15,000,000
Changes in certain current assets and liabilities --
-Receivables	(139,000,000)	(98,000,000)
-Fossil fuel stock	106,000,000	173,000,000
-Materials and supplies	(8,000,000)	16,000,000
-Other current assets	(32,000,000)	(18,000,000)
-Accounts payable	(64,000,000)	(109,000,000)
-Accrued taxes	210,000,000	105,000,000
-Accrued compensation	18,000,000	(36,000,000)
-Retail fuel cost over recovery - short-term	2,000,000	42,000,000
-Other current liabilities	3,000,000	(2,000,000)
Net cash provided from operating activities	1,398,000,000	1,469,000,000
Investing Activities:
Property additions	(966,000,000)	(779,000,000)
Nuclear decommissioning trust fund purchases	(178,000,000)	(162,000,000)
Nuclear decommissioning trust fund sales	178,000,000	162,000,000
Cost of removal, net of salvage	(50,000,000)	(29,000,000)
Change in construction payables	39,000,000	12,000,000
Other investing activities	(26,000,000)	35,000,000
Net cash used for investing activities	(1,003,000,000)	(761,000,000)
Proceeds --
Capital contributions from parent company	20,000,000	18,000,000
Senior notes issuances	400,000,000	0
Redemptions --
Payment of preferred and preference stock dividends	(30,000,000)	(30,000,000)
Payment of common stock dividends	(412,000,000)	(397,000,000)
Other financing activities	(6,000,000)	0
Net cash provided from (used for) financing activities	(28,000,000)	(409,000,000)
Net Change in Cash and Cash Equivalents	367,000,000	299,000,000
Cash and Cash Equivalents at Beginning of Period	295,000,000	137,000,000
Cash and Cash Equivalents at End of Period	662,000,000	436,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	174,000,000	182,000,000
Income taxes, net	227,000,000	154,000,000
Noncash transactions - accrued property additions at end of period	57,000,000	43,000,000
Georgia Power [Member]
Operating Activities:
Net income (loss)	1,115,000,000	979,000,000
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	757,000,000	734,000,000
Deferred income taxes	121,000,000	354,000,000
Allowance for equity funds used during construction	(29,000,000)	(24,000,000)
Retail fuel cost over recovery - long-term	(44,000,000)	(123,000,000)
Deferred expenses	(35,000,000)	(34,000,000)
Pension, postretirement, and other employee benefits	28,000,000	58,000,000
Other, net	23,000,000	28,000,000
Changes in certain current assets and liabilities --
-Receivables	(377,000,000)	(191,000,000)
-Fossil fuel stock	337,000,000	213,000,000
-Prepaid income taxes	19,000,000	11,000,000
-Other current assets	(24,000,000)	38,000,000
-Accrued taxes	148,000,000	131,000,000
-Other current liabilities	29,000,000	(46,000,000)
Net cash provided from operating activities	2,068,000,000	2,128,000,000
Investing Activities:
Property additions	(1,364,000,000)	(1,165,000,000)
Investment of restricted cash	0	(89,000,000)
Distribution of restricted cash	0	89,000,000
Nuclear decommissioning trust fund purchases	(457,000,000)	(582,000,000)
Nuclear decommissioning trust fund sales	455,000,000	580,000,000
Cost of removal, net of salvage	(39,000,000)	(42,000,000)
Change in construction payables, net of joint owner portion	16,000,000	(28,000,000)
Prepaid long-term service agreement	(66,000,000)	(14,000,000)
Other investing activities	(3,000,000)	0
Net cash used for investing activities	(1,458,000,000)	(1,251,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(836,000,000)	211,000,000
Proceeds --
Capital contributions from parent company	39,000,000	30,000,000
Pollution control revenue bonds issuances	40,000,000	89,000,000
Senior notes issuances	0	850,000,000
FFB loan	1,000,000,000	0
Redemptions --
Pollution control revenue bonds	(37,000,000)	(89,000,000)
Senior notes	0	(1,250,000,000)
Payment of preferred and preference stock dividends	(13,000,000)	(13,000,000)
Payment of common stock dividends	(715,000,000)	(680,000,000)
FFB loan issuance costs	(49,000,000)	(2,000,000)
Other financing activities	(6,000,000)	(15,000,000)
Net cash provided from (used for) financing activities	(577,000,000)	(869,000,000)
Net Change in Cash and Cash Equivalents	33,000,000	8,000,000
Cash and Cash Equivalents at Beginning of Period	30,000,000	45,000,000
Cash and Cash Equivalents at End of Period	63,000,000	53,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	235,000,000	247,000,000
Income taxes, net	309,000,000	109,000,000
Noncash transactions - accrued property additions at end of period	220,000,000	230,000,000
Gulf Power [Member]
Operating Activities:
Net income (loss)	124,139,000	104,581,000
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	115,093,000	116,626,000
Deferred income taxes	29,359,000	55,911,000
Allowance for equity funds used during construction	(8,276,000)	(4,318,000)
Pension, postretirement, and other employee benefits	5,693,000	9,279,000
Stock based compensation expense	1,520,000	1,389,000
Other, net	(2,667,000)	2,509,000
Changes in certain current assets and liabilities --
-Receivables	(45,777,000)	(49,690,000)
-Prepayments	2,894,000	2,568,000
-Fossil fuel stock	44,300,000	24,475,000
-Materials and supplies	1,007,000	(2,683,000)
-Prepaid income taxes	8,627,000	23,515,000
-Other current assets	(1,022,000)	0
-Accounts payable	10,097,000	(9,132,000)
-Accrued taxes	21,858,000	20,648,000
-Accrued compensation	5,131,000	(5,974,000)
-Over recovered regulatory clause revenues	6,834,000	(17,092,000)
-Other current liabilities	4,939,000	5,258,000
Net cash provided from operating activities	323,749,000	277,870,000
Investing Activities:
Property additions	(254,256,000)	(205,161,000)
Cost of removal, net of salvage	(9,309,000)	(12,563,000)
Change in construction payables	1,688,000	6,752,000
Payments pursuant to long-term service agreements	(6,097,000)	(3,843,000)
Other investing activities	89,000	306,000
Net cash used for investing activities	(267,885,000)	(214,509,000)
Financing Activities:
Increase (decrease) in notes payable, net	(44,395,000)	(65,077,000)
Proceeds --
Capital contributions from parent company	2,873,000	1,936,000
Preference stock	0	50,000,000
Pollution control revenue bonds issuances	42,075,000	63,000,000
Common stock issuances	50,000,000	40,000,000
Senior notes issuances	200,000,000	90,000,000
Redemptions --
Pollution control revenue bonds	(29,075,000)	(63,000,000)
Senior notes	0	(90,000,000)
Payment of preferred and preference stock dividends	(6,752,000)	(4,753,000)
Payment of common stock dividends	(92,400,000)	(86,550,000)
Other financing activities	(2,951,000)	(3,209,000)
Net cash provided from (used for) financing activities	119,375,000	(67,653,000)
Net Change in Cash and Cash Equivalents	175,239,000	(4,292,000)
Cash and Cash Equivalents at Beginning of Period	21,753,000	32,167,000
Cash and Cash Equivalents at End of Period	196,992,000	27,875,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	28,574,000	33,433,000
Income taxes, net	35,940,000	(17,064,000)
Noncash transactions - accrued property additions at end of period	34,876,000	30,846,000
Mississippi Power [Member]
Operating Activities:
Net income (loss)	(303,324,000)	(488,247,000)
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	77,774,000	68,436,000
Deferred income taxes	158,552,000	(391,143,000)
Investment tax credits	(108,171,000)	45,228,000
Allowance for equity funds used during construction	(107,685,000)	(87,740,000)
Regulatory assets associated with Kemper IGCC	(51,875,000)	(23,545,000)
Estimated loss on Kemper IGCC	798,000,000	1,062,000,000
Kemper regulatory deferral	111,828,000	61,997,000
Other, net	12,105,000	23,697,000
Changes in certain current assets and liabilities --
-Receivables	(30,452,000)	(40,003,000)
-Under recovered regulatory clause revenues	(17,845,000)	0
-Fossil fuel stock	35,917,000	59,608,000
-Materials and supplies	(9,080,000)	(8,029,000)
-Prepaid income taxes	(90,401,000)	33,793,000
-Other current assets	5,173,000	(1,710,000)
-Accounts payable	27,511,000	17,397,000
-Accrued taxes	(17,032,000)	(2,334,000)
-Accrued interest	23,939,000	15,153,000
-Accrued compensation	7,993,000	(8,543,000)
-Over recovered regulatory clause revenues	(18,358,000)	(49,247,000)
-Other current liabilities	154,000	0
Net cash provided from operating activities	504,723,000	286,768,000
Investing Activities:
Property additions	(986,019,000)	(1,221,519,000)
Investment of restricted cash	(10,548,000)	0
Distribution of restricted cash	9,104,000	0
Cost of removal, net of salvage	(7,431,000)	(5,769,000)
Change in construction payables	(40,301,000)	(6,200,000)
Capital grant proceeds	0	4,500,000
Proceeds from asset sales	0	79,020,000
Other investing activities	(14,804,000)	(3,659,000)
Net cash used for investing activities	(1,049,999,000)	(1,153,627,000)
Proceeds --
Capital contributions from parent company	310,860,000	601,197,000
Bonds-Other	22,866,000	31,092,000
Interest-bearing refundable deposit	75,000,000	0
Long-term debt issuance from parent company	220,000,000	0
Other long-term debt issuances	250,000,000	475,000,000
Redemptions --
Bonds — Other	0	(82,563,000)
Capital leases	(1,893,000)	(82,000)
Long-term debt to parent company	(220,000,000)	0
Other long-term debt	0	(125,000,000)
Payment of preferred and preference stock dividends	(1,299,000)	(1,299,000)
Payment of common stock dividends	0	(71,956,000)
Return of capital	(164,790,000)	(60,614,000)
Other financing activities	(687,000)	(1,845,000)
Net cash provided from (used for) financing activities	490,057,000	763,930,000
Net Change in Cash and Cash Equivalents	(55,219,000)	(102,929,000)
Cash and Cash Equivalents at Beginning of Period	145,165,000	145,008,000
Cash and Cash Equivalents at End of Period	89,946,000	42,079,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	4,930,000	15,568,000
Income taxes, net	(210,465,000)	(48,307,000)
Noncash transactions - accrued property additions at end of period	123,894,000	208,663,000
Noncash transactions - capital lease obligation	0	82,915,000
Southern Power [Member]
Operating Activities:
Net income (loss)	131,608,000	142,267,000
Adjustments to reconcile net income (loss) to net cash provided from operating activities --
Depreciation and amortization, total	158,264,000	131,955,000
Deferred income taxes	(6,340,000)	83,331,000
Investment tax credits	38,215,000	(25,137,000)
Deferred revenues	(2,452,000)	3,136,000
Other, net	3,853,000	962,000
Changes in certain current assets and liabilities --
-Receivables	(62,757,000)	(28,486,000)
-Fossil fuel stock	(1,565,000)	881,000
-Materials and supplies	(3,455,000)	(5,902,000)
-Prepaid income taxes	38,716,000	(12,485,000)
-Other current assets	(720,000)	(2,017,000)
-Accounts payable	26,989,000	(4,282,000)
-Accrued taxes	62,124,000	12,550,000
-Accrued interest	(13,451,000)	(8,306,000)
-Other current liabilities	2,000,000	235,000
Net cash provided from operating activities	371,029,000	288,702,000
Investing Activities:
Plant acquisition	(217,547,000)	(111,600,000)
Property additions	(14,782,000)	(463,873,000)
Investment of restricted cash	(166,000)	(20,000,000)
Change in construction payables	(3,282,000)	292,000
Payments pursuant to long-term service agreements	(41,782,000)	(40,978,000)
Other investing activities	(9,996,000)	(1,724,000)
Net cash used for investing activities	(287,555,000)	(637,883,000)
Financing Activities:
Increase (decrease) in notes payable, net	19,995,000	120,798,000
Proceeds --
Capital contributions from parent company	(3,628,000)	1,897,000
Senior notes issuances	0	300,000,000
Other long-term debt issuances	10,199,000	22,722,000
Redemptions --
Other long-term debt	(818,000)	(220,000)
Distributions to noncontrolling interest	(150,000)	(146,000)
Contributions from noncontrolling interest	7,492,000	16,802,000
Payment of common stock dividends	(98,340,000)	(96,840,000)
Other financing activities	(184,000)	(2,287,000)
Net cash provided from (used for) financing activities	(65,434,000)	362,726,000
Net Change in Cash and Cash Equivalents	18,040,000	13,545,000
Cash and Cash Equivalents at Beginning of Period	68,744,000	28,592,000
Cash and Cash Equivalents at End of Period	86,784,000	42,137,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	78,496,000	55,190,000
Income taxes, net	(91,193,000)	(6,518,000)
Noncash transactions - accrued property additions at end of period	$ 549,000	$ 36,370,000