Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Deferred Charges and Other Assets:
Total Assets	$ 67,654,000,000	$ 64,546,000,000
Common Stockholders' Equity:
Total Stockholders' Equity	20,613,000,000	19,764,000,000
Southern Company [Member]
Current Assets:
Cash and cash equivalents	1,414,000,000	659,000,000
Receivables --
Customer accounts receivable	1,439,000,000	1,027,000,000
Unbilled revenues	476,000,000	448,000,000
Under recovered regulatory clause revenues	104,000,000	58,000,000
Other accounts and notes receivable	259,000,000	304,000,000
Accumulated provision for uncollectible accounts	(20,000,000)	(18,000,000)
Fossil fuel stock, at average cost	817,000,000	1,339,000,000
Materials and supplies, at average cost	1,018,000,000	959,000,000
Vacation pay	170,000,000	171,000,000
Prepaid expenses	387,000,000	489,000,000
Other regulatory assets, current	147,000,000	124,000,000
Other current assets	47,000,000	39,000,000
Total current assets	6,258,000,000	5,599,000,000
Property, Plant, and Equipment:
In service	68,545,000,000	66,021,000,000
Less accumulated provision for depreciation	23,846,000,000	23,059,000,000
Plant in service, net of depreciation	44,699,000,000	42,962,000,000
Other utility plant, net	218,000,000	240,000,000
Nuclear fuel, at amortized cost	840,000,000	855,000,000
Construction work in progress	7,410,000,000	7,151,000,000
Total property, plant, and equipment	53,167,000,000	51,208,000,000
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,510,000,000	1,465,000,000
Leveraged leases	680,000,000	665,000,000
Miscellaneous property and investments	245,000,000	218,000,000
Total other property and investments	2,435,000,000	2,348,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	1,488,000,000	1,432,000,000
Prepaid pension costs	438,000,000	419,000,000
Unamortized debt issuance expense	206,000,000	139,000,000
Unamortized loss on reacquired debt	274,000,000	293,000,000
Other regulatory assets, deferred	2,624,000,000	2,557,000,000
Other deferred charges and assets	764,000,000	551,000,000
Total deferred charges and other assets	5,794,000,000	5,391,000,000
Total Assets	67,654,000,000	64,546,000,000
Current Liabilities:
Securities due within one year	2,398,000,000	469,000,000
Interest-bearing refundable deposit	225,000,000	150,000,000
Notes payable	361,000,000	1,482,000,000
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts payable	1,381,000,000	1,376,000,000
Customer deposits	386,000,000	380,000,000
Accrued taxes --
Accrued income taxes	238,000,000	13,000,000
Other accrued taxes	558,000,000	456,000,000
Accrued interest	270,000,000	251,000,000
Accrued vacation pay	213,000,000	217,000,000
Accrued compensation	423,000,000	303,000,000
Other regulatory liabilities, current	84,000,000	92,000,000
Other current liabilities	353,000,000	347,000,000
Total current liabilities	6,890,000,000	5,536,000,000
Long-term Debt	21,699,000,000	21,344,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,817,000,000	10,563,000,000
Deferred credits related to income taxes	191,000,000	202,000,000
Accumulated deferred investment tax credits	1,006,000,000	966,000,000
Employee benefit obligations	1,474,000,000	1,461,000,000
Asset retirement obligations	2,133,000,000	2,006,000,000
Other cost of removal obligations	1,341,000,000	1,270,000,000
Other regulatory liabilities, deferred	566,000,000	475,000,000
Other deferred credits and liabilities	549,000,000	584,000,000
Total deferred credits and other liabilities	18,077,000,000	17,527,000,000
Total Liabilities	46,666,000,000	44,407,000,000
Redeemable Preferred Stock of Subsidiaries	375,000,000	375,000,000
Common Stockholders' Equity:
Common stock	4,500,000,000	4,461,000,000
Paid-in capital	5,652,000,000	5,362,000,000
Treasury, at cost	(25,000,000)	(250,000,000)
Retained earnings (accumulated deficit)	9,800,000,000	9,510,000,000
Accumulated other comprehensive income (loss)	(70,000,000)	(75,000,000)
Total common stockholders' equity	19,857,000,000	19,008,000,000
Preferred and Preference Stock of Subsidiaries	756,000,000	756,000,000
Total Stockholders' Equity	20,613,000,000	19,764,000,000
Total Liabilities and Stockholders' Equity	67,654,000,000	64,546,000,000
Alabama Power [Member]
Current Assets:
Cash and cash equivalents	662,000,000	295,000,000
Receivables --
Customer accounts receivable	442,000,000	341,000,000
Unbilled revenues	133,000,000	142,000,000
Under recovered regulatory clause revenues	34,000,000	0
Other accounts and notes receivable	38,000,000	30,000,000
Affiliated companies	36,000,000	54,000,000
Accumulated provision for uncollectible accounts	(9,000,000)	(8,000,000)
Fossil fuel stock, at average cost	223,000,000	329,000,000
Materials and supplies, at average cost	397,000,000	375,000,000
Vacation pay	63,000,000	63,000,000
Prepaid expenses	83,000,000	57,000,000
Other regulatory assets, current	8,000,000	7,000,000
Other current assets	9,000,000	6,000,000
Total current assets	2,119,000,000	1,691,000,000
Property, Plant, and Equipment:
In service	22,688,000,000	22,092,000,000
Less accumulated provision for depreciation	8,430,000,000	8,114,000,000
Plant in service, net of depreciation	14,258,000,000	13,978,000,000
Nuclear fuel, at amortized cost	324,000,000	332,000,000
Construction work in progress	995,000,000	748,000,000
Total property, plant, and equipment	15,577,000,000	15,058,000,000
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	67,000,000	54,000,000
Nuclear decommissioning trusts, at fair value	738,000,000	714,000,000
Miscellaneous property and investments	83,000,000	80,000,000
Total other property and investments	888,000,000	848,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	528,000,000	519,000,000
Prepaid pension costs	290,000,000	276,000,000
Deferred under recovered regulatory clause revenues	46,000,000	25,000,000
Other regulatory assets, deferred	703,000,000	692,000,000
Other deferred charges and assets	142,000,000	142,000,000
Total deferred charges and other assets	1,709,000,000	1,654,000,000
Total Assets	20,293,000,000	19,251,000,000
Current Liabilities:
Securities due within one year	54,000,000	0
Accounts Payable and Accrued Liabilities, Current [Abstract]
Affiliated accounts payable	245,000,000	198,000,000
Other accounts payable	273,000,000	339,000,000
Customer deposits	86,000,000	85,000,000
Accrued taxes --
Accrued income taxes	146,000,000	11,000,000
Other accrued taxes	114,000,000	33,000,000
Accrued interest	62,000,000	61,000,000
Accrued vacation pay	53,000,000	53,000,000
Accrued compensation	98,000,000	74,000,000
Other regulatory liabilities, current	49,000,000	37,000,000
Other current liabilities	44,000,000	41,000,000
Total current liabilities	1,224,000,000	932,000,000
Long-term Debt	6,577,000,000	6,233,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,670,000,000	3,603,000,000
Deferred credits related to income taxes	72,000,000	75,000,000
Accumulated deferred investment tax credits	127,000,000	133,000,000
Employee benefit obligations	203,000,000	195,000,000
Asset retirement obligations	813,000,000	730,000,000
Other cost of removal obligations	864,000,000	828,000,000
Other regulatory liabilities, deferred	242,000,000	259,000,000
Deferred over recovered regulatory clause revenues	0	15,000,000
Other deferred credits and liabilities	54,000,000	61,000,000
Total deferred credits and other liabilities	6,045,000,000	5,899,000,000
Total Liabilities	13,846,000,000	13,064,000,000
Redeemable Preferred Stock	342,000,000	342,000,000
Preference Stock	343,000,000	343,000,000
Common Stockholders' Equity:
Common stock	1,222,000,000	1,222,000,000
Paid-in capital	2,292,000,000	2,262,000,000
Retained earnings (accumulated deficit)	2,273,000,000	2,044,000,000
Accumulated other comprehensive income (loss)	(25,000,000)	(26,000,000)
Total common stockholders' equity	5,762,000,000	5,502,000,000
Total Liabilities and Stockholders' Equity	20,293,000,000	19,251,000,000
Georgia Power [Member]
Current Assets:
Cash and cash equivalents	63,000,000	30,000,000
Receivables --
Customer accounts receivable	738,000,000	512,000,000
Unbilled revenues	241,000,000	209,000,000
Joint owner accounts receivable	75,000,000	67,000,000
Other accounts and notes receivable	54,000,000	117,000,000
Affiliated companies	21,000,000	21,000,000
Accumulated provision for uncollectible accounts	(8,000,000)	(5,000,000)
Fossil fuel stock, at average cost	405,000,000	742,000,000
Materials and supplies, at average cost	431,000,000	409,000,000
Vacation pay	88,000,000	88,000,000
Prepaid income taxes	57,000,000	97,000,000
Other regulatory assets, current	62,000,000	66,000,000
Other current assets	118,000,000	54,000,000
Total current assets	2,345,000,000	2,407,000,000
Property, Plant, and Equipment:
In service	30,818,000,000	30,132,000,000
Less accumulated provision for depreciation	11,192,000,000	10,970,000,000
Plant in service, net of depreciation	19,626,000,000	19,162,000,000
Other utility plant, net	218,000,000	240,000,000
Nuclear fuel, at amortized cost	516,000,000	523,000,000
Construction work in progress	3,884,000,000	3,500,000,000
Total property, plant, and equipment	24,244,000,000	23,425,000,000
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	58,000,000	46,000,000
Nuclear decommissioning trusts, at fair value	772,000,000	751,000,000
Miscellaneous property and investments	37,000,000	44,000,000
Total other property and investments	867,000,000	841,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	701,000,000	718,000,000
Prepaid pension costs	133,000,000	118,000,000
Deferred under recovered regulatory clause revenues	175,000,000	0
Other regulatory assets, deferred	1,156,000,000	1,152,000,000
Other deferred charges and assets	294,000,000	246,000,000
Total deferred charges and other assets	2,459,000,000	2,234,000,000
Total Assets	29,915,000,000	28,907,000,000
Current Liabilities:
Securities due within one year	503,000,000	5,000,000
Notes payable	211,000,000	1,047,000,000
Accounts Payable and Accrued Liabilities, Current [Abstract]
Affiliated accounts payable	503,000,000	417,000,000
Other accounts payable	476,000,000	472,000,000
Customer deposits	250,000,000	246,000,000
Accrued taxes --
Accrued income taxes	155,000,000	0
Other accrued taxes	313,000,000	321,000,000
Accrued interest	99,000,000	91,000,000
Accrued vacation pay	60,000,000	61,000,000
Accrued compensation	111,000,000	80,000,000
Other current liabilities	177,000,000	166,000,000
Total current liabilities	2,858,000,000	2,906,000,000
Long-term Debt	9,135,000,000	8,633,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	5,295,000,000	5,200,000,000
Deferred credits related to income taxes	107,000,000	112,000,000
Accumulated deferred investment tax credits	196,000,000	203,000,000
Employee benefit obligations	580,000,000	542,000,000
Asset retirement obligations	1,215,000,000	1,210,000,000
Other cost of removal obligations	58,000,000	43,000,000
Other deferred credits and liabilities	178,000,000	201,000,000
Total deferred credits and other liabilities	7,629,000,000	7,511,000,000
Total Liabilities	19,622,000,000	19,050,000,000
Redeemable Preferred Stock	45,000,000	45,000,000
Preference Stock	221,000,000	221,000,000
Common Stockholders' Equity:
Common stock	398,000,000	398,000,000
Paid-in capital	5,683,000,000	5,633,000,000
Retained earnings (accumulated deficit)	3,950,000,000	3,565,000,000
Accumulated other comprehensive income (loss)	(4,000,000)	(5,000,000)
Total common stockholders' equity	10,027,000,000	9,591,000,000
Total Liabilities and Stockholders' Equity	29,915,000,000	28,907,000,000
Gulf Power [Member]
Current Assets:
Cash and cash equivalents	196,992,000	21,753,000
Receivables --
Customer accounts receivable	98,357,000	64,884,000
Unbilled revenues	63,950,000	57,282,000
Under recovered regulatory clause revenues	52,531,000	48,282,000
Other accounts and notes receivable	10,131,000	8,620,000
Affiliated companies	7,405,000	8,259,000
Accumulated provision for uncollectible accounts	(1,695,000)	(1,131,000)
Fossil fuel stock, at average cost	90,750,000	135,050,000
Materials and supplies, at average cost	53,928,000	54,935,000
Prepaid expenses	8,374,000	33,186,000
Other regulatory assets, current	42,683,000	18,536,000
Other current assets	3,805,000	6,120,000
Total current assets	627,211,000	455,776,000
Property, Plant, and Equipment:
In service	4,444,015,000	4,363,664,000
Less accumulated provision for depreciation	1,277,290,000	1,211,336,000
Plant in service, net of depreciation	3,166,725,000	3,152,328,000
Construction work in progress	433,299,000	280,626,000
Total property, plant, and equipment	3,600,024,000	3,432,954,000
Other Property and Investments:
Total other property and investments	15,212,000	15,314,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	54,856,000	50,597,000
Prepaid pension costs	11,639,000	11,533,000
Other regulatory assets, deferred	322,370,000	340,415,000
Other deferred charges and assets	38,394,000	30,982,000
Total deferred charges and other assets	427,259,000	433,527,000
Total Assets	4,669,706,000	4,337,571,000
Current Liabilities:
Securities due within one year	75,000,000	75,000,000
Notes payable	91,483,000	135,878,000
Accounts Payable and Accrued Liabilities, Current [Abstract]
Affiliated accounts payable	82,258,000	76,897,000
Other accounts payable	55,713,000	47,038,000
Customer deposits	35,188,000	34,433,000
Accrued taxes --
Accrued income taxes	16,124,000	45,000
Other accrued taxes	29,777,000	7,486,000
Accrued interest	17,808,000	10,272,000
Accrued compensation	16,839,000	11,657,000
Other regulatory liabilities, current	9,136,000	13,408,000
Liabilities from risk management activities	7,337,000	6,470,000
Other current liabilities	41,716,000	22,972,000
Total current liabilities	478,379,000	441,556,000
Long-term Debt	1,369,447,000	1,158,163,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	746,866,000	734,355,000
Accumulated deferred investment tax credits	3,101,000	4,055,000
Employee benefit obligations	78,004,000	76,338,000
Other cost of removal obligations	233,926,000	228,148,000
Other regulatory liabilities, deferred	50,859,000	56,051,000
Deferred capacity expense	168,574,000	180,149,000
Other deferred credits and liabilities	78,671,000	77,126,000
Total deferred credits and other liabilities	1,360,001,000	1,356,222,000
Total Liabilities	3,207,827,000	2,955,941,000
Preference Stock	146,504,000	146,504,000
Common Stockholders' Equity:
Common stock	483,060,000	433,060,000
Paid-in capital	557,664,000	552,681,000
Retained earnings (accumulated deficit)	275,481,000	250,494,000
Accumulated other comprehensive income (loss)	(830,000)	(1,109,000)
Total common stockholders' equity	1,315,375,000	1,235,126,000
Total Liabilities and Stockholders' Equity	4,669,706,000	4,337,571,000
Mississippi Power [Member]
Current Assets:
Cash and cash equivalents	89,946,000	145,165,000
Receivables --
Customer accounts receivable	53,593,000	40,978,000
Unbilled revenues	38,575,000	38,895,000
Under recovered regulatory clause revenues	17,845,000	0
Other accounts and notes receivable	3,995,000	4,600,000
Affiliated companies	53,682,000	34,920,000
Accumulated provision for uncollectible accounts	(1,980,000)	(3,018,000)
Fossil fuel stock, at average cost	77,368,000	113,285,000
Materials and supplies, at average cost	55,166,000	45,347,000
Prepaid income taxes	162,790,000	34,751,000
Other regulatory assets, current	53,854,000	52,496,000
Other current assets	4,676,000	9,357,000
Total current assets	609,510,000	516,776,000
Property, Plant, and Equipment:
In service	4,323,501,000	3,458,770,000
Less accumulated provision for depreciation	1,149,432,000	1,095,352,000
Plant in service, net of depreciation	3,174,069,000	2,363,418,000
Construction work in progress	1,987,789,000	2,586,031,000
Total property, plant, and equipment	5,161,858,000	4,949,449,000
Other Property and Investments:
Total other property and investments	6,863,000	4,857,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	197,278,000	139,834,000
Other regulatory assets, deferred	255,430,000	200,620,000
Accumulated deferred income taxes	25,255,000	0
Other deferred charges and assets	54,929,000	36,673,000
Total deferred charges and other assets	532,892,000	377,127,000
Total Assets	6,311,123,000	5,848,209,000
Current Liabilities:
Securities due within one year	811,751,000	13,789,000
Interest-bearing refundable deposit	225,000,000	150,000,000
Accounts Payable and Accrued Liabilities, Current [Abstract]
Affiliated accounts payable	90,488,000	70,299,000
Other accounts payable	177,212,000	210,191,000
Customer deposits	14,946,000	14,379,000
Accrued taxes --
Accrued income taxes	92,018,000	5,590,000
Other accrued taxes	65,375,000	77,958,000
Accrued interest	70,956,000	47,144,000
Accrued compensation	17,317,000	9,324,000
Other regulatory liabilities, current	10,138,000	24,981,000
Over recovered regulatory clause liabilities	0	18,358,000
Other current liabilities	21,634,000	21,413,000
Total current liabilities	1,596,835,000	663,426,000
Long-term Debt	1,633,394,000	2,167,067,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	159,061,000	72,808,000
Deferred credits related to income taxes	6,639,000	9,145,000
Accumulated deferred investment tax credits	283,382,000	284,248,000
Employee benefit obligations	94,539,000	94,430,000
Asset retirement obligations	42,624,000	41,197,000
Other cost of removal obligations	162,274,000	151,340,000
Other regulatory liabilities, deferred	263,531,000	140,880,000
Other deferred credits and liabilities	15,037,000	14,337,000
Total deferred credits and other liabilities	1,027,087,000	808,385,000
Total Liabilities	4,257,316,000	3,638,878,000
Redeemable Preferred Stock	32,780,000	32,780,000
Common Stockholders' Equity:
Common stock	37,691,000	37,691,000
Paid-in capital	2,525,056,000	2,376,595,000
Retained earnings (accumulated deficit)	(534,493,000)	(229,871,000)
Accumulated other comprehensive income (loss)	(7,227,000)	(7,864,000)
Total common stockholders' equity	2,021,027,000	2,176,551,000
Total Liabilities and Stockholders' Equity	6,311,123,000	5,848,209,000
Southern Power [Member]
Current Assets:
Cash and cash equivalents	86,784,000	68,744,000
Receivables --
Customer accounts receivable	103,740,000	73,497,000
Other accounts and notes receivable	9,107,000	3,983,000
Affiliated companies	46,089,000	38,391,000
Fossil fuel stock, at average cost	20,743,000	19,178,000
Materials and supplies, at average cost	58,234,000	54,780,000
Prepaid service agreements - current	30,996,000	81,206,000
Prepaid income taxes	47,374,000	54,732,000
Prepaid expenses	8,518,000	7,915,000
Assets from risk management activities	810,000	182,000
Total current assets	412,395,000	402,608,000
Property, Plant, and Equipment:
In service	4,941,745,000	4,696,134,000
Less accumulated provision for depreciation	981,568,000	871,963,000
Plant in service, net of depreciation	3,960,177,000	3,824,171,000
Construction work in progress	11,329,000	9,843,000
Total property, plant, and equipment	3,971,506,000	3,834,014,000
Other Property and Investments:
Goodwill	1,839,000	1,839,000
Other intangible assets, net of amortization of $7,583 and $5,614 at September 30, 2014 and December 31, 2013, respectively	47,787,000	43,505,000
Total other property and investments	49,626,000	45,344,000
Deferred Charges and Other Assets:
Prepaid long-term service agreements	83,403,000	73,676,000
Other deferred charges and assets -- affiliated	2,556,000	4,605,000
Other deferred charges and assets	89,097,000	68,853,000
Total deferred charges and other assets	175,056,000	147,134,000
Total Assets	4,608,583,000	4,429,100,000
Current Liabilities:
Securities due within one year	531,184,000	599,000
Notes payable	19,995,000	0
Accounts Payable and Accrued Liabilities, Current [Abstract]
Affiliated accounts payable	89,853,000	56,661,000
Other accounts payable	11,842,000	20,747,000
Accrued taxes --
Accrued income taxes	8,939,000	161,000
Other accrued taxes	13,115,000	2,662,000
Accrued interest	14,901,000	28,352,000
Other current liabilities	6,549,000	18,492,000
Total current liabilities	696,378,000	127,674,000
Long-term Debt	1,098,078,000	1,619,241,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	749,528,000	724,390,000
Deferred convertible investment tax credits	396,020,000	340,269,000
Deferred capacity revenues -- affiliated	26,989,000	15,279,000
Other deferred credits and liabilities — affiliated	858,000	1,621,000
Other deferred credits and liabilities	10,740,000	7,896,000
Total deferred credits and other liabilities	1,184,135,000	1,089,455,000
Total Liabilities	2,978,591,000	2,836,370,000
Redeemable Noncontrolling Interest	39,813,000	28,778,000
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	1,025,407,000	1,029,035,000
Retained earnings (accumulated deficit)	561,573,000	531,998,000
Accumulated other comprehensive income (loss)	3,199,000	2,919,000
Total common stockholders' equity	1,590,179,000	1,563,952,000
Total Liabilities and Stockholders' Equity	$ 4,608,583,000	$ 4,429,100,000