Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Net Income	$ 2,415,000,000		$ 2,268,000,000		$ 2,040,000,000
Net income after dividends on preferred and preference stock	2,350,000,000	[1]	2,203,000,000	[1]	1,975,000,000	[1]
Qualifying hedges:
Changes in fair value, net of tax	(12,000,000)		(18,000,000)		(1,000,000)
Reclassification adjustment for amounts included in net income, net of tax	11,000,000		9,000,000		15,000,000
Marketable securities:
Change in fair value, net of tax	0		(4,000,000)		(3,000,000)
Pension and other postretirement benefit plans:
Benefit plan net gain (loss),net of tax	(3,000,000)		(2,000,000)		6,000,000
Reclassification adjustment for amounts included in net income, net of tax	(8,000,000)		(26,000,000)		1,000,000
Total other comprehensive income (loss)	(12,000,000)		(41,000,000)		18,000,000
Dividends on preferred and preference stock	(65,000,000)		(65,000,000)		(65,000,000)
Comprehensive Income	2,338,000,000		2,162,000,000		1,993,000,000
Alabama Power [Member]
Net Income	743,000,000		747,000,000		746,000,000
Net income after dividends on preferred and preference stock	704,000,000		708,000,000		707,000,000
Qualifying hedges:
Changes in fair value, net of tax	(11,000,000)		(9,000,000)		0
Reclassification adjustment for amounts included in net income, net of tax	2,000,000		(2,000,000)		(2,000,000)
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	(9,000,000)		(11,000,000)		(2,000,000)
Dividends on preferred and preference stock	(39,000,000)		(39,000,000)		(39,000,000)
Comprehensive Income	734,000,000		736,000,000		744,000,000
Georgia Power [Member]
Net Income	1,185,000,000		1,162,000,000		967,000,000
Net income after dividends on preferred and preference stock	1,168,000,000		1,145,000,000		950,000,000
Qualifying hedges:
Reclassification adjustment for amounts included in net income, net of tax	2,000,000		2,000,000		10,000,000
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	2,000,000		2,000,000		10,000,000
Dividends on preferred and preference stock	(17,000,000)		(17,000,000)		(17,000,000)
Comprehensive Income	1,187,000,000		1,164,000,000		977,000,000
Gulf Power [Member]
Net Income	132,135,000		111,208,000		127,714,000
Net income after dividends on preferred and preference stock	125,932,000		105,005,000		121,511,000
Qualifying hedges:
Changes in fair value, net of tax	0		0		(863,000)
Reclassification adjustment for amounts included in net income, net of tax	573,000		573,000		598,000
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	573,000		573,000		(265,000)
Dividends on preferred and preference stock	(6,203,000)		(6,203,000)		(6,203,000)
Comprehensive Income	132,708,000		111,781,000		127,449,000
Mississippi Power [Member]
Net Income	149,840,000		95,915,000		81,950,000
Net income after dividends on preferred and preference stock	148,107,000		94,182,000		80,217,000
Qualifying hedges:
Changes in fair value, net of tax	(479,000)		(8,870,000)		2,000
Reclassification adjustment for amounts included in net income, net of tax	663,000		(29,000)		0
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	184,000		(8,899,000)		2,000
Dividends on preferred and preference stock	(1,733,000)		(1,733,000)		(1,733,000)
Comprehensive Income	150,024,000		87,016,000		81,952,000
Southern Power [Member]
Net Income	175,285,000		162,231,000		131,309,000
Qualifying hedges:
Changes in fair value, net of tax	(136,000)		65,000		938,000
Reclassification adjustment for amounts included in net income, net of tax	6,189,000		7,125,000		6,444,000
Pension and other postretirement benefit plans:
Total other comprehensive income (loss)	6,053,000		7,190,000		7,382,000
Comprehensive Income	$ 181,338,000		$ 169,421,000		$ 138,691,000

[1] *After dividends on preferred and preference stock of subsidiaries.