Consolidated Statements of Capitalization (USD $)	Dec. 31, 2013	Dec. 31, 2012
Maturity
Total long term debt payable to affiliated trusts	$ 206,000,000	$ 206,000,000
Long-term senior notes and debt:
Long-term debt maturities, 2016	1,360,000,000	1,360,000,000
Long-term debt maturities, 2017	1,095,000,000	1,095,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	850,000,000	250,000,000
Long-term debt maturities, thereafter	10,798,000,000	9,823,000,000
2013	0	1,436,000,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	428,000,000	434,000,000
Long-term debt maturities, 2015	2,375,000,000	2,375,000,000
Total long -term senior notes and debt	17,892,000,000	17,649,000,000
Pollution control revenue bonds --
Total other long -term debt	3,503,000,000	3,621,000,000
Capitalized lease obligations	163,000,000	80,000,000
Unamortized debt premium (related to plant acquisition)	79,000,000	88,000,000
Unamortized debt discount	(30,000,000)	(35,000,000)
Total long-term debt (annual interest requirement )	21,813,000,000	21,609,000,000
Less amount due within one year	469,000,000	2,335,000,000
Long-term debt excluding amount due within one year	21,344,000,000	19,274,000,000
Percent capitalization	51.50%	49.90%
Redeemable Preferred and Preference Stock:
Redeemable preferred stock	375,000,000	375,000,000
Total redeemable preferred stock - percent capitalization	0.90%	1.00%
Preferred and preference stock of subsidiaries	756,000,000	707,000,000
Total preferred and preference stock of subsidiaries - percent capitalization	1.80%	1.80%
Common Stockholders' Equity:
Common stock	4,461,000,000	4,389,000,000
Paid-in capital	5,362,000,000	4,855,000,000
Treasury, at cost	(250,000,000)	(450,000,000)
Retained earnings	9,510,000,000	9,626,000,000
Accumulated other comprehensive loss	(75,000,000)	(123,000,000)
Total Common Stockholders' Equity	19,008,000,000	18,297,000,000
Total common stockholders' equity - percent capitalization	45.80%	47.30%
Total stockholders' equity	19,764,000,000	19,004,000,000
Total Capitalization	41,483,000,000	38,653,000,000
Percent Capitalization	100.00%	100.00%
Redeemable Preferred Stock, $100 par or stated value | Cumulative Preferred Stock
Redeemable Preferred and Preference Stock:
Redeemable preferred stock	81,000,000	81,000,000
Redeemable Preferred Stock, $1 par value | Cumulative Preferred Stock
Redeemable Preferred and Preference Stock:
Redeemable preferred stock	294,000,000	294,000,000
Noncumulative Preferred Stock
Redeemable Preferred and Preference Stock:
Preferred and preference stock of subsidiaries	45,000,000	45,000,000
Preference Stock, $1 par value
Redeemable Preferred and Preference Stock:
Preferred and preference stock of subsidiaries	343,000,000	343,000,000
Preference Stock , $100 par or stated value
Redeemable Preferred and Preference Stock:
Preferred and preference stock of subsidiaries	368,000,000	319,000,000
2014 | Adjustable Rate Loans [Member]
Maturity
Fixed stated interest rate of debt obligation	1.29%
Variable rate, Due 2042
Maturity
Total long term debt payable to affiliated trusts	206,000,000	206,000,000
Fixed stated interest rate of debt obligation	3.35%
2019 through 2049
Pollution control revenue bonds --
Long-term pollution control bonds	1,478,000,000	1,593,000,000
Variable rate, Due 2015
Maturity
Fixed stated interest rate of debt obligation	0.04%
Pollution control revenue bonds --
Long-term pollution control bonds	54,000,000	54,000,000
Variable rate, Due 2016
Maturity
Fixed stated interest rate of debt obligation	0.06%
Pollution control revenue bonds --
Long-term pollution control bonds	4,000,000	4,000,000
Variable rate, Due 2017
Pollution control revenue bonds --
Long-term pollution control bonds	36,000,000	36,000,000
Variable rate, Due 2018
Maturity
Fixed stated interest rate of debt obligation	0.04%
Pollution control revenue bonds --
Long-term pollution control bonds	19,000,000	19,000,000
Variable rate, Due 2020 to 2052
Pollution control revenue bonds --
Long-term pollution control bonds	1,642,000,000	1,645,000,000
Due 2021
Maturity
Fixed stated interest rate of debt obligation	7.13%	7.13%
Pollution control revenue bonds --
Taxable Revenue Bonds	270,000,000	270,000,000
Adjustable Rate Loans [Member]
Long-term senior notes and debt:
Long-term debt maturities, 2016	450,000,000	0
2013	0	876,000,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	11,000,000	0
Long-term debt maturities, 2015	525,000,000	0
Alabama Power [Member]
Maturity
Total long term debt payable to affiliated trusts	206,000,000	206,000,000
Long-term senior notes and debt:
Long-term debt maturities, 2016	200,000,000	200,000,000
Long-term debt maturities, 2017	525,000,000	525,000,000
Long-term debt maturities, thereafter	3,750,000,000	3,450,000,000
2013	0	250,000,000
Long-term debt maturities, 2015	400,000,000	400,000,000
Total long-term notes payable	4,875,000,000	4,825,000,000
Pollution control revenue bonds --
Long-term pollution control bonds	1,200,000,000	1,200,000,000
Total other long -term debt	1,151,000,000	1,151,000,000
Capitalized lease obligations	5,000,000	0
Unamortized debt (discount), net	(4,000,000)	(3,000,000)
Total long-term debt (annual interest requirement )	6,233,000,000	6,179,000,000
Less amount due within one year	0	250,000,000
Long-term debt excluding amount due within one year	6,233,000,000	5,929,000,000
Percent capitalization	50.20%	49.40%
Redeemable Preferred and Preference Stock:
Redeemable preferred stock	342,000,000	342,000,000
Total redeemable preferred stock - percent capitalization	2.70%	2.80%
Preference stock	343,000,000	343,000,000
Preferred stock	342,000,000	342,000,000
Total preferred and preference stock of subsidiaries - percent capitalization	2.80%	2.90%
Common Stockholders' Equity:
Common stock	1,222,000,000	1,222,000,000
Paid-in capital	2,262,000,000	2,227,000,000
Retained earnings	2,044,000,000	1,976,000,000
Accumulated other comprehensive loss	(26,000,000)	(27,000,000)
Total Common Stockholders' Equity	5,502,000,000	5,398,000,000
Total common stockholders' equity - percent capitalization	44.30%	44.90%
Total stockholders' equity	5,502,000,000	5,398,000,000
Total Capitalization	12,420,000,000	12,012,000,000
Percent Capitalization	100.00%	100.00%
Alabama Power [Member] | Redeemable Preferred Stock, $100 par or stated value | Cumulative Preferred Stock
Redeemable Preferred and Preference Stock:
Redeemable preferred stock	48,000,000	48,000,000
Alabama Power [Member] | Redeemable Preferred Stock, $1 par value | Cumulative Preferred Stock
Redeemable Preferred and Preference Stock:
Redeemable preferred stock	294,000,000	294,000,000
Alabama Power [Member] | 2013
Maturity
Fixed stated interest rate of debt obligation		5.80%
Alabama Power [Member] | 2015
Maturity
Fixed stated interest rate of debt obligation	0.55%	0.55%
Alabama Power [Member] | 2016
Maturity
Fixed stated interest rate of debt obligation	5.20%	5.20%
Alabama Power [Member] | Variable rate, Due 2042
Maturity
Fixed stated interest rate of debt obligation	3.35%
Alabama Power [Member] | Variable rate, Due 2017
Pollution control revenue bonds --
Long-term pollution control bonds	36,000,000	36,000,000
Alabama Power [Member] | Maturity of Pollution Control Bonds Two Thousand Thirty Four [Member]
Pollution control revenue bonds --
Long-term pollution control bonds	367,000,000	367,000,000
Alabama Power [Member] | Variable rate, Due 2015
Maturity
Fixed stated interest rate of debt obligation	0.04%
Pollution control revenue bonds --
Long-term pollution control bonds	54,000,000	54,000,000
Alabama Power [Member] | Maturity Of Pollution Control Bonds Variable Rate Two Thousand Twenty One To Two Thousand Thirty Eight [Member]
Pollution control revenue bonds --
Long-term pollution control bonds	694,000,000	694,000,000
Georgia Power [Member]
Long-term senior notes and debt:
Long-term debt maturities, 2016	250,000,000	250,000,000
Long-term debt maturities, 2017	450,000,000	450,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	250,000,000	250,000,000
Long-term debt maturities, thereafter	4,475,000,000	4,175,000,000
Variable, 2013	0	650,000,000
Long Term Debt Maturities Repayments of Principal Variable in Year Four	450,000,000	0
2013	0	1,025,000,000
Long-term debt maturities, 2015	1,050,000,000	1,050,000,000
Total long-term notes payable	6,925,000,000	7,850,000,000
Pollution control revenue bonds --
Long-term pollution control bonds	1,700,000,000	1,800,000,000
Total other long -term debt	1,680,000,000	1,784,000,000
Capitalized lease obligations	45,000,000	50,000,000
Unamortized debt (discount), net	(12,000,000)	(10,000,000)
Total long-term debt (annual interest requirement )	8,638,000,000	9,674,000,000
Less amount due within one year	5,000,000	1,680,000,000
Long-term debt excluding amount due within one year	8,633,000,000	7,994,000,000
Percent capitalization	46.70%	45.60%
Redeemable Preferred and Preference Stock:
Preference stock	221,000,000	221,000,000
Preferred stock	45,000,000	45,000,000
Total preferred and preference stock of subsidiaries - percent capitalization	1.40%	1.50%
Common Stockholders' Equity:
Common stock	398,000,000	398,000,000
Paid-in capital	5,633,000,000	5,585,000,000
Retained earnings	3,565,000,000	3,297,000,000
Accumulated other comprehensive loss	(5,000,000)	(7,000,000)
Total Common Stockholders' Equity	9,591,000,000	9,273,000,000
Total common stockholders' equity - percent capitalization	51.90%	52.90%
Total stockholders' equity	9,591,000,000	9,273,000,000
Total Capitalization	18,490,000,000	17,533,000,000
Percent Capitalization	100.00%	100.00%
Georgia Power [Member] | Noncumulative Preferred Stock
Redeemable Preferred and Preference Stock:
Total preferred and preference stock	266,000,000	266,000,000
Georgia Power [Member] | Noncumulative Preferred Stock, $25 par value
Redeemable Preferred and Preference Stock:
Preferred stock	45,000,000	45,000,000
Georgia Power [Member] | Noncumulative Preferred Stock, $100 par value
Redeemable Preferred and Preference Stock:
Preference stock	221,000,000	221,000,000
Georgia Power [Member] | 2016
Maturity
Fixed stated interest rate of debt obligation	3.00%	3.00%
Georgia Power [Member] | 2017
Maturity
Fixed stated interest rate of debt obligation	5.70%	5.70%
Georgia Power [Member] | 2018
Maturity
Fixed stated interest rate of debt obligation	5.40%	5.40%
Georgia Power [Member] | Variable rate, Due 2016
Maturity
Fixed stated interest rate of debt obligation	0.06%
Pollution control revenue bonds --
Long-term pollution control bonds	4,000,000	4,000,000
Georgia Power [Member] | Variable rate, Due 2018
Maturity
Fixed stated interest rate of debt obligation	0.04%
Pollution control revenue bonds --
Long-term pollution control bonds	20,000,000	20,000,000
Georgia Power [Member] | 2022 - 2049
Pollution control revenue bonds --
Long-term pollution control bonds	818,000,000	919,000,000
Georgia Power [Member] | Maturity of Pollution Control Bonds Variable Rate Due Two Thousand Twenty Two to Two Thousand Fifty Two [Member]
Pollution control revenue bonds --
Long-term pollution control bonds	838,000,000	841,000,000
Gulf Power [Member]
Long-term senior notes and debt:
Long-term debt maturities, 2016	110,000,000	110,000,000
Long-term debt maturities, 2017	85,000,000	85,000,000
Long-term debt maturities, thereafter	675,000,000	615,000,000
2013	0	60,000,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	75,000,000	75,000,000
Total long-term notes payable	945,000,000	945,000,000
Pollution control revenue bonds --
Long-term pollution control bonds	296,000,000	309,000,000
Total other long -term debt	295,955,000	308,955,000
Unamortized debt (discount), net	(7,792,000)	(8,085,000)
Total long-term debt (annual interest requirement )	1,233,163,000	1,245,870,000
Less amount due within one year	75,000,000	60,000,000
Long-term debt excluding amount due within one year	1,158,163,000	1,185,870,000
Percent capitalization	45.60%	48.10%
Redeemable Preferred and Preference Stock:
Total redeemable preferred stock - percent capitalization	5.80%	4.00%
Preference stock	146,504,000	97,998,000
Common Stockholders' Equity:
Common stock	433,060,000	393,060,000
Paid-in capital	552,681,000	547,798,000
Retained earnings	250,494,000	241,465,000
Accumulated other comprehensive loss	(1,109,000)	(1,581,000)
Total Common Stockholders' Equity	1,235,126,000	1,180,742,000
Total common stockholders' equity - percent capitalization	48.60%	47.90%
Total stockholders' equity	1,235,126,000	1,180,742,000
Total Capitalization	2,539,793,000	2,464,610,000
Percent Capitalization	100.00%	100.00%
Gulf Power [Member] | 6% Preference stock
Redeemable Preferred and Preference Stock:
Preference stock	53,886,000	53,886,000
Gulf Power [Member] | 6.45 % Preference stock
Redeemable Preferred and Preference Stock:
Preference stock	44,112,000	44,112,000
Gulf Power [Member] | Five Point Six Percentage Hundred Dollar Par or Stated Value [Member]
Redeemable Preferred and Preference Stock:
Preference stock	48,506,000	0
Gulf Power [Member] | 2013
Maturity
Fixed stated interest rate of debt obligation		4.35%
Gulf Power [Member] | 2014
Maturity
Fixed stated interest rate of debt obligation	4.90%	4.90%
Gulf Power [Member] | 2016
Maturity
Fixed stated interest rate of debt obligation	5.30%	5.30%
Gulf Power [Member] | 2017
Maturity
Fixed stated interest rate of debt obligation	5.90%	5.90%
Gulf Power [Member] | 2022 - 2049
Pollution control revenue bonds --
Long-term pollution control bonds	226,625,000	239,625,000
Gulf Power [Member] | Variable Rate, Due 2022-2039
Pollution control revenue bonds --
Long-term pollution control bonds	69,330,000	69,330,000
Mississippi Power [Member]
Maturity
Fixed stated interest rate of debt obligation	9.932%	9.967%
Long-term senior notes and debt:
Long-term debt maturities, 2016	300,000,000	300,000,000
Long-term debt maturities, 2017	35,000,000	35,000,000
Long-term debt maturities, thereafter	805,000,000	805,000,000
Long Term Debt Maturities Repayments of Principal Adjustable in Last Twelve Months	0	226,471,000
Adjustable, 2014	11,250,000	0
Long Term Debt Maturities Repayments of Principal Adjustable in Year Two	525,000,000	0
2013	0	50,000,000
Total long-term notes payable	1,676,250,000	1,416,471,000
Pollution control revenue bonds --
Long-term pollution control bonds	82,700,000	82,700,000
Taxable Revenue Bonds	11,300,000	51,500,000
Total other long -term debt	352,695,000	352,695,000
Capitalized lease obligations	82,217,000	0
Unamortized debt premium (related to plant acquisition)	71,807,000	80,912,000
Unamortized debt discount	(2,113,000)	(9,145,000)
Total long-term debt (annual interest requirement )	2,180,856,000	1,840,933,000
Less amount due within one year	13,789,000	276,471,000
Long-term debt excluding amount due within one year	2,167,067,000	1,564,462,000
Percent capitalization	49.60%	46.70%
Redeemable Preferred and Preference Stock:
Total redeemable preferred stock - percent capitalization	0.70%	1.00%
Preferred stock	32,780,000	32,780,000
Common Stockholders' Equity:
Common stock	37,691,000	37,691,000
Paid-in capital	2,376,595,000	1,401,520,000
Retained earnings	(229,871,000)	318,710,000
Accumulated other comprehensive loss	(7,864,000)	(8,713,000)
Total Common Stockholders' Equity	2,176,551,000	1,749,208,000
Total common stockholders' equity - percent capitalization	49.70%	52.30%
Total stockholders' equity	2,176,551,000	1,749,208,000
Total Capitalization	4,376,398,000	3,346,450,000
Percent Capitalization	100.00%	100.00%
Mississippi Power [Member] | 2013
Maturity
Fixed stated interest rate of debt obligation		6.00%
Mississippi Power [Member] | 2016
Maturity
Fixed stated interest rate of debt obligation	2.35%	2.35%
Mississippi Power [Member] | 2017
Maturity
Fixed stated interest rate of debt obligation	5.60%	5.60%
Mississippi Power [Member] | Due 2021
Maturity
Fixed stated interest rate of debt obligation	7.13%	7.13%
Pollution control revenue bonds --
Taxable Revenue Bonds	270,000,000	270,000,000
Mississippi Power [Member] | Variable Rate, Due 2020-2028
Pollution control revenue bonds --
Long-term pollution control bonds	40,070,000	40,070,000
Mississippi Power [Member] | 2028
Pollution control revenue bonds --
Long-term pollution control bonds	$ 42,625,000	$ 42,625,000