Consolidated Statements of Common Stockholders Equity (USD $) Share data in Thousands	Total		Common Stock	Treasury Stock	Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Preferred and Preference Stock of Subsidiaries	Alabama Power [Member]	Alabama Power [Member] Common Stock	Alabama Power [Member] Paid In Capital	Alabama Power [Member] Retained Earnings	Alabama Power [Member] Accumulated Other Comprehensive Income (Loss)	Georgia Power [Member]	Georgia Power [Member] Common Stock	Georgia Power [Member] Paid In Capital	Georgia Power [Member] Retained Earnings	Georgia Power [Member] Accumulated Other Comprehensive Income (Loss)	Gulf Power [Member]	Gulf Power [Member] Common Stock	Gulf Power [Member] Paid In Capital	Gulf Power [Member] Retained Earnings	Gulf Power [Member] Accumulated Other Comprehensive Income (Loss)	Mississippi Power [Member]	Mississippi Power [Member] Common Stock	Mississippi Power [Member] Paid In Capital	Mississippi Power [Member] Retained Earnings	Mississippi Power [Member] Accumulated Other Comprehensive Income (Loss)	Southern Power [Member]	Southern Power [Member] Common Stock	Southern Power [Member] Paid In Capital	Southern Power [Member] Retained Earnings	Southern Power [Member] Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2010	$ 16,909,000,000		$ 4,219,000,000	$ (15,000,000)	$ 3,702,000,000	$ 8,366,000,000	$ (70,000,000)	$ 707,000,000	$ 5,393,000,000	$ 1,222,000,000	$ 2,156,000,000	$ 2,022,000,000	$ (7,000,000)	$ 8,741,000,000	$ 398,000,000	$ 5,291,000,000	$ 3,063,000,000	$ (11,000,000)	$ 1,075,036,000	$ 303,060,000	$ 538,375,000	$ 236,328,000	$ (2,727,000)	$ 737,368,000	$ 37,691,000	$ 392,790,000	$ 306,885,000	$ 2,000	$ 1,263,220,000	$ 0	$ 900,969,000	$ 376,270,000	$ (14,019,000)
Beginning Balance, Shares at Dec. 31, 2010			843,814	474						31,000					9,000					3,643					1,121					1
Net income after dividends on preferred and preference stock	2,203,000,000	[1]				2,203,000,000			708,000,000			708,000,000		1,145,000,000			1,145,000,000		105,005,000			105,005,000		94,182,000			94,182,000
Net Income	2,268,000,000								747,000,000					1,162,000,000					111,208,000					95,915,000					162,231,000			162,231,000
Capital contributions from parent company									26,000,000		26,000,000			231,000,000		231,000,000			4,334,000		4,334,000			302,065,000		302,065,000			127,241,000		127,241,000
Other comprehensive income (loss)	(41,000,000)						(41,000,000)		(11,000,000)				(11,000,000)	2,000,000				2,000,000	573,000				573,000	(8,899,000)				(8,899,000)	7,190,000				7,190,000
Stock issued, shares			21,850																	500
Stock issued	725,000,000		109,000,000		616,000,000														50,000,000	50,000,000
Stock-based compensation	89,000,000				89,000,000
Cash dividends on common stock	(1,601,000,000)					(1,601,000,000)			(774,000,000)			(774,000,000)		(1,096,000,000)			(1,096,000,000)		(110,000,000)			(110,000,000)		(75,500,000)			(75,500,000)		(91,200,000)			(91,200,000)
Other, shares				(65)
Other	1,000,000			(2,000,000)	3,000,000	0																		1,000			1,000
Ending Balance at Dec. 31, 2011	18,285,000,000		4,328,000,000	(17,000,000)	4,410,000,000	8,968,000,000	(111,000,000)	707,000,000	5,342,000,000	1,222,000,000	2,182,000,000	1,956,000,000	(18,000,000)	9,023,000,000	398,000,000	5,522,000,000	3,112,000,000	(9,000,000)	1,124,948,000	353,060,000	542,709,000	231,333,000	(2,154,000)	1,049,217,000	37,691,000	694,855,000	325,568,000	(8,897,000)	1,468,682,000	0	1,028,210,000	447,301,000	(6,829,000)
Ending Balance, Shares at Dec. 31, 2011			865,664	539						31,000					9,000					4,143					1,121					1
Net income after dividends on preferred and preference stock	368,000,000								126,000,000					167,000,000					20,666,000					25,255,000					29,316,000
Ending Balance at Mar. 31, 2012
Beginning Balance at Dec. 31, 2011	18,285,000,000		4,328,000,000	(17,000,000)	4,410,000,000	8,968,000,000	(111,000,000)	707,000,000	5,342,000,000	1,222,000,000	2,182,000,000	1,956,000,000	(18,000,000)	9,023,000,000	398,000,000	5,522,000,000	3,112,000,000	(9,000,000)	1,124,948,000	353,060,000	542,709,000	231,333,000	(2,154,000)	1,049,217,000	37,691,000	694,855,000	325,568,000	(8,897,000)	1,468,682,000	0	1,028,210,000	447,301,000	(6,829,000)
Beginning Balance, Shares at Dec. 31, 2011			865,664	539						31,000					9,000					4,143					1,121					1
Net income after dividends on preferred and preference stock	2,350,000,000	[1]				2,350,000,000			704,000,000			704,000,000		1,168,000,000			1,168,000,000		125,932,000			125,932,000		99,942,000			99,942,000
Net Income	2,415,000,000								743,000,000					1,185,000,000					132,135,000					101,675,000					175,285,000			175,285,000
Capital contributions from parent company									45,000,000		45,000,000			63,000,000		63,000,000			5,089,000		5,089,000			706,665,000		706,665,000			(662,000)		(662,000)
Other comprehensive income (loss)	(12,000,000)						(12,000,000)		(9,000,000)				(9,000,000)	2,000,000				2,000,000	573,000				573,000	184,000				184,000	6,053,000				6,053,000
Stock issued, shares			12,139																	400
Stock issued	397,000,000		61,000,000		336,000,000														40,000,000	40,000,000	0
Stock repurchased, at cost, shares				(9,440)
Stock repurchased, at cost	(430,000,000)			(430,000,000)
Stock-based compensation	106,000,000				106,000,000
Cash dividends on common stock	(1,693,000,000)					(1,693,000,000)			(684,000,000)			(684,000,000)		(983,000,000)			(983,000,000)		(115,800,000)			(115,800,000)		(106,800,000)			(106,800,000)		(127,000,000)			(127,000,000)
Other, shares				(56)
Other	1,000,000			(3,000,000)	3,000,000	1,000,000																										(1,000)
Ending Balance at Dec. 31, 2012	19,004,000,000		4,389,000,000	(450,000,000)	4,855,000,000	9,626,000,000	(123,000,000)		5,398,000,000	1,222,000,000	2,227,000,000	1,976,000,000	(27,000,000)	9,273,000,000	398,000,000	5,585,000,000	3,297,000,000	(7,000,000)	1,180,742,000	393,060,000	547,798,000	241,465,000	(1,581,000)	1,749,208,000	37,691,000	1,401,520,000	318,710,000	(8,713,000)	1,522,357,000	0	1,027,548,000	495,585,000	(776,000)
Ending Balance, Shares at Dec. 31, 2012			877,803	10,035						31,000					9,000					4,543					1,121					1
Beginning Balance at Sep. 30, 2012
Net income after dividends on preferred and preference stock	383,000,000								113,000,000					181,000,000					22,549,000					(14,965,000)					30,991,000
Ending Balance at Dec. 31, 2012	19,004,000,000								5,398,000,000	1,222,000,000				9,273,000,000	398,000,000				1,180,742,000					1,749,208,000	37,691,000				1,522,357,000	0
Ending Balance, Shares at Dec. 31, 2012										31,000					9,000										1,121					1
Net income after dividends on preferred and preference stock	81,000,000								141,000,000					197,000,000					21,792,000					(246,321,000)					29,192,000
Ending Balance at Mar. 31, 2013
Beginning Balance at Dec. 31, 2012	19,004,000,000		4,389,000,000	(450,000,000)	4,855,000,000	9,626,000,000	(123,000,000)	707,000,000	5,398,000,000	1,222,000,000	2,227,000,000	1,976,000,000	(27,000,000)	9,273,000,000	398,000,000	5,585,000,000	3,297,000,000	(7,000,000)	1,180,742,000	393,060,000	547,798,000	241,465,000	(1,581,000)	1,749,208,000	37,691,000	1,401,520,000	318,710,000	(8,713,000)	1,522,357,000	0	1,027,548,000	495,585,000	(776,000)
Beginning Balance, Shares at Dec. 31, 2012			877,803	10,035						31,000					9,000					4,543					1,121					1
Net income after dividends on preferred and preference stock	1,644,000,000	[1],[2]				1,644,000,000			712,000,000			712,000,000		1,174,000,000			1,174,000,000		124,429,000			124,429,000		(476,625,000)			(476,625,000)
Net Income	1,710,000,000								751,000,000					1,191,000,000					132,133,000					(474,892,000)					165,533,000			165,533,000
Capital contributions from parent company									35,000,000		35,000,000			48,000,000		48,000,000			4,883,000		4,883,000			975,075,000		975,075,000			1,487,000		1,487,000
Other comprehensive income (loss)	48,000,000						48,000,000		1,000,000				1,000,000	2,000,000				2,000,000	472,000				472,000	849,000				849,000	3,695,000				3,695,000
Stock issued, shares			14,930	4,443																400
Stock issued	765,000,000		72,000,000	203,000,000	441,000,000			49,000,000											40,000,000	40,000,000
Stock-based compensation	65,000,000				65,000,000
Cash dividends on common stock	(1,762,000,000)					(1,762,000,000)			(644,000,000)			(644,000,000)		(907,000,000)			(907,000,000)		(115,400,000)			(115,400,000)		(71,956,000)			(71,956,000)		(129,120,000)			(129,120,000)
Other, shares				(55)
Other	0			(3,000,000)	1,000,000	2,000,000								1,000,000			1,000,000
Ending Balance at Dec. 31, 2013	19,764,000,000		4,461,000,000	(250,000,000)	5,362,000,000	9,510,000,000	(75,000,000)	756,000,000	5,502,000,000	1,222,000,000	2,262,000,000	2,044,000,000	(26,000,000)	9,591,000,000	398,000,000	5,633,000,000	3,565,000,000	(5,000,000)	1,235,126,000	433,060,000	552,681,000	250,494,000	(1,109,000)	2,176,551,000	37,691,000	2,376,595,000	(229,871,000)	(7,864,000)	1,563,952,000	0	1,029,035,000	531,998,000	2,919,000
Ending Balance, Shares at Dec. 31, 2013			892,733	5,647						31,000					9,000					4,943					1,121					1
Beginning Balance at Sep. 30, 2013
Net income after dividends on preferred and preference stock	414,000,000								140,000,000					208,000,000					25,301,000					12,921,000					23,266,000
Ending Balance at Dec. 31, 2013	$ 19,764,000,000								$ 5,502,000,000	$ 1,222,000,000				$ 9,591,000,000	$ 398,000,000				$ 1,235,126,000					$ 2,176,551,000	$ 37,691,000				$ 1,563,952,000	$ 0
Ending Balance, Shares at Dec. 31, 2013										31,000					9,000										1,121					1

[1] (a) After dividends on preferred and preference stock of subsidiaries.

[2] (b) Segment net income (loss) in 2013 includes $1.2 billion in pre-tax charges ($729 million after tax) for estimated probable losses on the Kemper IGCC. See Note (3) under "Integrated Coal Gasification Combined Cycle – Kemper IGCC Construction Schedule and Cost Estimate" for additional information.