Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities:
Consolidated net income	$ 1,279,000,000	$ 2,016,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	1,725,000,000	1,602,000,000
Deferred income taxes	263,000,000	645,000,000
Allowance for equity funds used during construction	(139,000,000)	(102,000,000)
Leveraged lease income (loss)	11,000,000	(16,000,000)
Pension, postretirement, and other employee benefits	124,000,000	78,000,000
Stock based compensation expense	48,000,000	45,000,000
Retail fuel cost over recovery - long-term	(123,000,000)	118,000,000
Estimated loss on Kemper IGCC	1,140,000,000	0
Other, net	64,000,000	34,000,000
Changes in certain current assets and liabilities --
-Receivables	(407,000,000)	(157,000,000)
-Fossil fuel stock	471,000,000	(232,000,000)
-Materials and supplies	33,000,000	(28,000,000)
-Other current assets	(1,000,000)	22,000,000
-Accounts payable	(140,000,000)	(240,000,000)
-Accrued taxes	268,000,000	311,000,000
-Accrued compensation	(198,000,000)	(142,000,000)
-Retail fuel cost over recovery - short-term	(3,000,000)	112,000,000
-Other current liabilities	(4,000,000)	(22,000,000)
Net cash provided from operating activities	4,411,000,000	4,044,000,000
Investing Activities:
Property additions	(3,978,000,000)	(3,558,000,000)
Investment of restricted cash	(169,000,000)	(230,000,000)
Distribution of restricted cash	94,000,000	234,000,000
Nuclear decommissioning trust fund purchases	(744,000,000)	(758,000,000)
Nuclear decommissioning trust fund sales	742,000,000	756,000,000
Cost of removal, net of salvage	(90,000,000)	(83,000,000)
Change in construction payables	(8,000,000)	(61,000,000)
Other investing activities	51,000,000	(58,000,000)
Net cash used for investing activities	(4,102,000,000)	(3,758,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(70,000,000)	(521,000,000)
Proceeds --
Long-term debt issuances	2,421,000,000	3,114,000,000
Interest-bearing refundable deposit related to asset sale	0	150,000,000
Preference stock	50,000,000	0
Common stock issuances	479,000,000	381,000,000
Redemptions --
Long-term debt	(1,767,000,000)	(2,098,000,000)
Common stock repurchased	(19,000,000)	(85,000,000)
Payment of common stock dividends	(1,314,000,000)	(1,267,000,000)
Payment of dividends on preferred and preference stock of subsidiaries	(49,000,000)	(49,000,000)
Other financing activities	14,000,000	30,000,000
Net cash provided from (used for) financing activities	(255,000,000)	(345,000,000)
Net Change in Cash and Cash Equivalents	54,000,000	(59,000,000)
Cash and Cash Equivalents at Beginning of Period	628,000,000	1,315,000,000
Cash and Cash Equivalents at End of Period	682,000,000	1,256,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	564,000,000	589,000,000
Income taxes, net	149,000,000	6,000,000
Noncash transactions - accrued property additions at end of period	539,000,000	531,000,000
Noncash transactions — capital lease obligation	83,000,000	0
Alabama Power [Member]
Operating Activities:
Consolidated net income	602,000,000	621,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	616,000,000	574,000,000
Deferred income taxes	200,000,000	132,000,000
Allowance for equity funds used during construction	(23,000,000)	(13,000,000)
Pension, postretirement, and other employee benefits	17,000,000	10,000,000
Stock based compensation expense	8,000,000	7,000,000
Other, net	(24,000,000)	(3,000,000)
Changes in certain current assets and liabilities --
-Receivables	(98,000,000)	(83,000,000)
-Fossil fuel stock	173,000,000	(93,000,000)
-Materials and supplies	16,000,000	(5,000,000)
-Other current assets	(18,000,000)	(1,000,000)
-Accounts payable	(109,000,000)	(167,000,000)
-Accrued taxes	105,000,000	146,000,000
-Accrued compensation	(36,000,000)	(27,000,000)
-Retail fuel cost over recovery - short-term	42,000,000	2,000,000
-Other current liabilities	(2,000,000)	(15,000,000)
Net cash provided from operating activities	1,469,000,000	1,085,000,000
Investing Activities:
Property additions	(779,000,000)	(616,000,000)
Nuclear decommissioning trust fund purchases	(162,000,000)	(128,000,000)
Nuclear decommissioning trust fund sales	162,000,000	128,000,000
Cost of removal, net of salvage	(29,000,000)	(17,000,000)
Change in construction payables	12,000,000	(2,000,000)
Other investing activities	35,000,000	(11,000,000)
Net cash used for investing activities	(761,000,000)	(646,000,000)
Proceeds --
Capital contributions from parent company	18,000,000	22,000,000
Senior notes issuances	0	250,000,000
Redemptions --
Pollution control revenue bonds	0	(1,000,000)
Senior notes	0	(250,000,000)
Payment of preferred and preference stock dividends	(30,000,000)	(30,000,000)
Payment of common stock dividends	(397,000,000)	(404,000,000)
Other financing activities	0	(4,000,000)
Net cash provided from (used for) financing activities	(409,000,000)	(417,000,000)
Net Change in Cash and Cash Equivalents	299,000,000	22,000,000
Cash and Cash Equivalents at Beginning of Period	137,000,000	344,000,000
Cash and Cash Equivalents at End of Period	436,000,000	366,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	182,000,000	203,000,000
Income taxes, net	154,000,000	172,000,000
Noncash transactions - accrued property additions at end of period	43,000,000	16,000,000
Georgia Power [Member]
Operating Activities:
Consolidated net income	979,000,000	1,000,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	734,000,000	684,000,000
Deferred income taxes	354,000,000	243,000,000
Allowance for equity funds used during construction	(24,000,000)	(41,000,000)
Pension, postretirement, and other employee benefits	58,000,000	23,000,000
Retail fuel cost over recovery - long-term	(123,000,000)	118,000,000
Deferred expenses	(34,000,000)	(20,000,000)
Other, net	28,000,000	0
Changes in certain current assets and liabilities --
-Receivables	(191,000,000)	(23,000,000)
-Fossil fuel stock	213,000,000	(126,000,000)
-Prepaid income taxes	11,000,000	40,000,000
-Other current assets	38,000,000	4,000,000
-Accounts payable	(5,000,000)	(57,000,000)
-Accrued taxes	131,000,000	40,000,000
-Accrued compensation	(53,000,000)	(43,000,000)
-Retail fuel cost over recovery - short-term	7,000,000	81,000,000
-Other current liabilities	5,000,000	48,000,000
Net cash provided from operating activities	2,128,000,000	1,971,000,000
Investing Activities:
Property additions	(1,165,000,000)	(1,291,000,000)
Investment of restricted cash	(89,000,000)	(234,000,000)
Distribution of restricted cash	89,000,000	234,000,000
Nuclear decommissioning trust fund purchases	(582,000,000)	(630,000,000)
Nuclear decommissioning trust fund sales	580,000,000	628,000,000
Cost of removal, net of salvage	(42,000,000)	(42,000,000)
Change in construction payables, net of joint owner portion	(28,000,000)	(141,000,000)
Other investing activities	(14,000,000)	9,000,000
Net cash used for investing activities	(1,251,000,000)	(1,467,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	211,000,000	(513,000,000)
Proceeds --
Capital contributions from parent company	30,000,000	29,000,000
Pollution control revenue bonds issuances	89,000,000	234,000,000
Senior notes issuances	850,000,000	1,900,000,000
Redemptions --
Pollution control revenue bonds	(89,000,000)	(234,000,000)
Senior notes	(1,250,000,000)	(550,000,000)
Other long-term debt	0	(250,000,000)
Payment of preferred and preference stock dividends	(13,000,000)	(13,000,000)
Payment of common stock dividends	(680,000,000)	(681,000,000)
Other financing activities	(17,000,000)	(14,000,000)
Net cash provided from (used for) financing activities	(869,000,000)	(92,000,000)
Net Change in Cash and Cash Equivalents	8,000,000	412,000,000
Cash and Cash Equivalents at Beginning of Period	45,000,000	13,000,000
Cash and Cash Equivalents at End of Period	53,000,000	425,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	247,000,000	237,000,000
Income taxes, net	109,000,000	186,000,000
Noncash transactions - accrued property additions at end of period	230,000,000	253,000,000
Gulf Power [Member]
Operating Activities:
Consolidated net income	104,581,000	108,035,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	116,626,000	109,132,000
Deferred income taxes	55,911,000	132,367,000
Allowance for equity funds used during construction	(4,318,000)	(3,988,000)
Pension, postretirement, and other employee benefits	9,279,000	4,361,000
Stock based compensation expense	1,389,000	1,346,000
Other, net	2,509,000	3,839,000
Changes in certain current assets and liabilities --
-Receivables	(49,690,000)	(10,995,000)
-Prepayments	2,568,000	3,066,000
-Fossil fuel stock	24,475,000	14,055,000
-Materials and supplies	(2,683,000)	(3,859,000)
-Prepaid income taxes	23,515,000	28,108,000
-Accounts payable	(9,132,000)	(453,000)
-Accrued taxes	20,648,000	18,566,000
-Accrued compensation	(5,974,000)	(4,263,000)
-Over recovered regulatory clause revenues	(17,092,000)	7,387,000
-Other current liabilities	5,258,000	(925,000)
Net cash provided from operating activities	277,870,000	405,779,000
Investing Activities:
Property additions	(205,161,000)	(239,705,000)
Cost of removal, net of salvage	(12,563,000)	(20,931,000)
Change in construction payables	6,752,000	(542,000)
Payments pursuant to long-term service agreements	(3,843,000)	(6,184,000)
Other investing activities	306,000	627,000
Net cash used for investing activities	(214,509,000)	(266,735,000)
Financing Activities:
Increase (decrease) in notes payable, net	(65,077,000)	(91,699,000)
Proceeds --
Capital contributions from parent company	1,936,000	1,569,000
Pollution control revenue bonds issuances	63,000,000	0
Preference stock	50,000,000	0
Common stock issuances	40,000,000	40,000,000
Senior notes issuances	90,000,000	100,000,000
Redemptions --
Pollution control revenue bonds	(63,000,000)	0
Senior notes	(90,000,000)	(91,363,000)
Payment of preferred and preference stock dividends	(4,753,000)	(4,652,000)
Payment of common stock dividends	(86,550,000)	(86,850,000)
Other financing activities	(3,209,000)	(468,000)
Net cash provided from (used for) financing activities	(67,653,000)	(133,463,000)
Net Change in Cash and Cash Equivalents	(4,292,000)	5,581,000
Cash and Cash Equivalents at Beginning of Period	32,167,000	17,328,000
Cash and Cash Equivalents at End of Period	27,875,000	22,909,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	33,433,000	38,806,000
Income taxes, net	(17,064,000)	(101,825,000)
Noncash transactions - accrued property additions at end of period	30,846,000	25,115,000
Mississippi Power [Member]
Operating Activities:
Consolidated net income	(488,247,000)	116,206,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	68,436,000	65,902,000
Deferred income taxes	(391,143,000)	8,527,000
Investment tax credits	45,228,000	38,811,000
Allowance for equity funds used during construction	(87,740,000)	(43,460,000)
Pension, postretirement, and other employee benefits	12,876,000	6,700,000
Hedge settlements	0	(15,983,000)
Stock based compensation expense	2,029,000	1,718,000
Regulatory assets associated with Kemper IGCC	(23,545,000)	(11,921,000)
Estimated loss on Kemper IGCC	1,062,000,000	0
Kemper regulatory deferral	61,997,000	0
Other, net	8,792,000	7,086,000
Changes in certain current assets and liabilities --
-Receivables	(40,003,000)	(17,622,000)
-Fossil fuel stock	59,608,000	(19,888,000)
-Materials and supplies	(8,029,000)	(2,683,000)
-Prepaid income taxes	33,793,000	2,517,000
-Other current assets	(1,710,000)	(14,652,000)
-Accounts payable	17,397,000	13,581,000
-Accrued taxes	(2,334,000)	2,361,000
-Accrued interest	15,153,000	16,015,000
-Accrued compensation	(8,543,000)	(4,830,000)
-Over recovered regulatory clause revenues	(49,247,000)	10,982,000
-Other current liabilities	0	(1,488,000)
Net cash provided from operating activities	286,768,000	157,879,000
Investing Activities:
Property additions	(1,221,519,000)	(1,169,653,000)
Cost of removal, net of salvage	(5,769,000)	(3,092,000)
Change in construction payables	(6,200,000)	97,360,000
Capital grant proceeds	4,500,000	10,058,000
Proceeds from asset sales	79,020,000	0
Other investing activities	(3,659,000)	(12,891,000)
Net cash used for investing activities	(1,153,627,000)	(1,078,218,000)
Proceeds --
Capital contributions from parent company	601,197,000	429,272,000
Bonds-Other	31,092,000	25,613,000
Interest-bearing refundable deposit related to asset sale	0	150,000,000
Senior notes issuances	0	600,000,000
Other long-term debt issuances	475,000,000	0
Redemptions --
Bonds-Other	(82,563,000)	0
Capital leases	(82,000)	(633,000)
Other long-term debt	(125,000,000)	(205,000,000)
Return of paid in capital	(60,614,000)	0
Payment of preferred and preference stock dividends	(1,299,000)	(1,299,000)
Payment of common stock dividends	(71,956,000)	(80,100,000)
Other financing activities	(1,845,000)	7,597,000
Net cash provided from (used for) financing activities	763,930,000	925,450,000
Net Change in Cash and Cash Equivalents	(102,929,000)	5,111,000
Cash and Cash Equivalents at Beginning of Period	145,008,000	211,585,000
Cash and Cash Equivalents at End of Period	42,079,000	216,696,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	15,568,000	22,948,000
Income taxes, net	(48,307,000)	(11,737,000)
Noncash transactions - accrued property additions at end of period	208,663,000	233,262,000
Noncash transactions — capital lease obligation	82,915,000	0
Southern Power [Member]
Operating Activities:
Consolidated net income	142,267,000	144,294,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	131,955,000	112,013,000
Deferred income taxes	83,331,000	147,993,000
Investment tax credits	(25,137,000)	36,308,000
Deferred revenues	3,136,000	9,299,000
Mark-to-market adjustments	68,000	(8,970,000)
Other, net	894,000	1,168,000
Changes in certain current assets and liabilities --
-Receivables	(28,486,000)	(20,427,000)
-Fossil fuel stock	881,000	(6,440,000)
-Materials and supplies	(5,902,000)	(5,557,000)
-Prepaid income taxes	(12,485,000)	(5,669,000)
-Other current assets	(2,017,000)	(2,159,000)
-Accounts payable	(4,282,000)	5,668,000
-Accrued taxes	12,550,000	48,203,000
-Accrued interest	(8,306,000)	(10,225,000)
-Other current liabilities	235,000	808,000
Net cash provided from operating activities	288,702,000	446,307,000
Investing Activities:
Plant acquisition	(111,600,000)	(113,651,000)
Property additions	(463,873,000)	(97,569,000)
Investment of restricted cash	(20,000,000)	0
Change in construction payables	292,000	(17,557,000)
Payments pursuant to long-term service agreements	(40,978,000)	(52,650,000)
Other investing activities	(1,724,000)	153,000
Net cash used for investing activities	(637,883,000)	(281,274,000)
Financing Activities:
Increase (decrease) in notes payable, net	120,798,000	(78,059,000)
Proceeds --
Capital contributions from parent company	1,897,000	(681,000)
Senior notes issuances	300,000,000	0
Other long-term debt issuances	22,722,000	4,949,000
Redemptions --
Other long-term debt	(220,000)	(650,000)
Payment of common stock dividends	(96,840,000)	(95,250,000)
Other financing activities	14,369,000	3,776,000
Net cash provided from (used for) financing activities	362,726,000	(165,915,000)
Net Change in Cash and Cash Equivalents	13,545,000	(882,000)
Cash and Cash Equivalents at Beginning of Period	28,592,000	16,943,000
Cash and Cash Equivalents at End of Period	42,137,000	16,061,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	55,190,000	46,163,000
Income taxes, net	(6,518,000)	(137,756,000)
Noncash transactions - accrued property additions at end of period	$ 36,370,000	$ 21,034,000