Fair Value Assets and Liabilities (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Assets:
Cash and Cash Equivalents	$ 443,000,000	[1],[2]			$ 443,000,000	[1],[2]			$ 221,000,000	[1]
Other Temporary Investments	278,000,000				278,000,000				294,000,000
Risk Management Assets
Risk Management Assets	565,000,000				565,000,000				596,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,700,000,000				1,700,000,000				1,592,000,000
Total Assets	2,986,000,000				2,986,000,000				2,703,000,000
Liabilities:
Risk Management Liabilities	374,000,000				374,000,000				345,000,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	97,000,000		77,000,000		69,000,000		85,000,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(5,000,000)	[3],[4]	(16,000,000)	[3],[4]	(16,000,000)	[3],[4]	(11,000,000)	[3],[4]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	7,000,000	[3]	(5,000,000)	[3]	20,000,000	[3]	0	[3]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	5,000,000		0		2,000,000		0
Purchases, Issuances and Settlements	4,000,000	[5]	3,000,000	[5]	33,000,000	[5]	5,000,000	[5]
Transfers into Level 3	(3,000,000)	[6],[7]	5,000,000	[6],[7]	10,000,000	[6],[7]	9,000,000	[6],[7]
Transfers out of Level 3	(1,000,000)	[7],[8]	(1,000,000)	[7],[8]	(21,000,000)	[7],[8]	(12,000,000)	[7],[8]
Changes in Fair Value Allocated to Regulated Jurisdictions	0	[9]	1,000,000	[9]	7,000,000	[9]	(12,000,000)	[9]
Ending Balance	104,000,000		64,000,000		104,000,000		64,000,000
Level 3 Quantitative Information [Abstract]
Counterparty Credit Risk					457
Level 1 [Member]
Assets:
Cash and Cash Equivalents	20,000,000	[1],[2]			20,000,000	[1],[2]			6,000,000	[1]
Other Temporary Investments	264,000,000				264,000,000				269,000,000
Risk Management Assets
Risk Management Assets	56,000,000				56,000,000				62,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	732,000,000				732,000,000				646,000,000
Total Assets	1,072,000,000				1,072,000,000				983,000,000
Liabilities:
Risk Management Liabilities	42,000,000				42,000,000				43,000,000
Level 2 [Member]
Assets:
Cash and Cash Equivalents	1,000,000	[1],[2]			1,000,000	[1],[2]			0	[1]
Other Temporary Investments	5,000,000				5,000,000				0
Risk Management Assets
Risk Management Assets	1,115,000,000				1,115,000,000				1,322,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	960,000,000				960,000,000				933,000,000
Total Assets	2,081,000,000				2,081,000,000				2,255,000,000
Liabilities:
Risk Management Liabilities	1,080,000,000				1,080,000,000				1,294,000,000
Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[1],[2]			0	[1],[2]			0	[1]
Other Temporary Investments	0				0				0
Risk Management Assets
Risk Management Assets	168,000,000				168,000,000				147,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	168,000,000				168,000,000				147,000,000
Liabilities:
Risk Management Liabilities	64,000,000				64,000,000				78,000,000
Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	422,000,000	[1],[2]			422,000,000	[1],[2]			215,000,000	[1]
Other Temporary Investments	9,000,000				9,000,000				25,000,000
Risk Management Assets
Risk Management Assets	(774,000,000)				(774,000,000)				(935,000,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,000,000				8,000,000				13,000,000
Total Assets	(335,000,000)				(335,000,000)				(682,000,000)
Liabilities:
Risk Management Liabilities	(812,000,000)				(812,000,000)				(1,070,000,000)
2012 [Member] | Level 1 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities									3,000,000
2012 [Member] | Level 2 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities									21,000,000
2012 [Member] | Level 3 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	7,000,000				7,000,000				(19,000,000)
2013 - 2015 [Member] | Level 1 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	12,000,000				12,000,000				7,000,000
2013 - 2015 [Member] | Level 2 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	59,000,000				59,000,000				50,000,000
2013 - 2015 [Member] | Level 3 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	35,000,000				35,000,000				44,000,000
2016 - 2018 [Member] | Level 1 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	(7,000,000)				(7,000,000)				(6,000,000)
2016 - 2017 [Member] | Level 2 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	14,000,000				14,000,000				11,000,000
2016 - 2017 [Member] | Level 3 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	31,000,000				31,000,000				18,000,000
2018 - 2030 [Member] | Level 2 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	9,000,000				9,000,000				8,000,000
2018 - 2030 [Member] | Level 3 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	29,000,000				29,000,000				26,000,000
Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	511,000,000	[10],[11]			511,000,000	[10],[11]			548,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	303,000,000	[10],[11]			303,000,000	[10],[11]			278,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	47,000,000	[10],[11]			47,000,000	[10],[11]			47,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	42,000,000	[10],[11]			42,000,000	[10],[11]			43,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,076,000,000	[10],[11]			1,076,000,000	[10],[11]			1,299,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	994,000,000	[10],[11]			994,000,000	[10],[11]			1,209,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	166,000,000	[10],[11]			166,000,000	[10],[11]			147,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	64,000,000	[10],[11]			64,000,000	[10],[11]			78,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(778,000,000)	[10],[11]			(778,000,000)	[10],[11]			(945,000,000)	[10],[12]
Liabilities:
Risk Management Liabilities	(797,000,000)	[10],[11]			(797,000,000)	[10],[11]			(1,052,000,000)	[10],[12]
Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	160,000,000				160,000,000
Liabilities:
Risk Management Liabilities	57,000,000				57,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	10.45				10.45
Forward Price Range High	117.64				117.64
FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	8,000,000				8,000,000
Liabilities:
Risk Management Liabilities	7,000,000				7,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(7.71)				(7.71)
Forward Price Range High	9.92				9.92
Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	33,000,000	[10]			33,000,000	[10]			20,000,000	[10]
Liabilities:
Risk Management Liabilities	32,000,000	[10]			32,000,000	[10]			25,000,000	[10]
Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	9,000,000	[10]			9,000,000	[10]			15,000,000	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	37,000,000	[10]			37,000,000	[10]			23,000,000	[10]
Liabilities:
Risk Management Liabilities	47,000,000	[10]			47,000,000	[10]			43,000,000	[10]
Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	2,000,000	[10]			2,000,000	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(15,000,000)	[10]			(15,000,000)	[10]			(18,000,000)	[10]
Liabilities:
Risk Management Liabilities	(15,000,000)	[10]			(15,000,000)	[10]			(18,000,000)	[10]
Interest Rate Foreign Currency Hedges [Member]
Liabilities:
Risk Management Liabilities	39,000,000				39,000,000				42,000,000
Interest Rate Foreign Currency Hedges [Member] | Level 1 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Interest Rate Foreign Currency Hedges [Member] | Level 2 [Member]
Liabilities:
Risk Management Liabilities	39,000,000				39,000,000				42,000,000
Interest Rate Foreign Currency Hedges [Member] | Level 3 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Interest Rate Foreign Currency Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Fair Value Hedges [Member]
Risk Management Assets
Risk Management Assets	2,000,000				2,000,000
Fair Value Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0				0
Fair Value Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	2,000,000				2,000,000
Fair Value Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0				0
Fair Value Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	0				0
Appalachian Power Co [Member]
Risk Management Assets
Risk Management Assets	69,598,000				69,598,000				78,871,000
Liabilities:
Risk Management Liabilities	39,131,000				39,131,000				39,529,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	12,864,000		5,321,000		1,971,000		5,131,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(3,540,000)	[13],[4]	(4,553,000)	[13],[4]	(5,108,000)	[13],[4]	(2,373,000)	[13],[4]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[13]	0	[13]	0	[13]	0	[13]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	403,000		(7,000)		312,000		(45,000)
Purchases, Issuances and Settlements	929,000	[5]	358,000	[5]	10,605,000	[5]	2,835,000	[5]
Transfers into Level 3	654,000	[6],[7]	0	[6],[7]	4,142,000	[6],[7]	1,299,000	[6],[7]
Transfers out of Level 3	(287,000)	[7],[8]	(259,000)	[7],[8]	(4,910,000)	[7],[8]	(3,057,000)	[7],[8]
Changes in Fair Value Allocated to Regulated Jurisdictions	17,000	[14]	(91,000)	[14]	4,028,000	[14]	(3,021,000)	[14]
Ending Balance	11,040,000		769,000		11,040,000		769,000
Appalachian Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	4,301,000				4,301,000				4,680,000
Liabilities:
Risk Management Liabilities	1,931,000				1,931,000				2,535,000
Appalachian Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	220,339,000				220,339,000				303,223,000
Liabilities:
Risk Management Liabilities	211,905,000				211,905,000				294,203,000
Appalachian Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	23,646,000				23,646,000				25,423,000
Liabilities:
Risk Management Liabilities	12,606,000				12,606,000				23,452,000
Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(178,688,000)				(178,688,000)				(254,455,000)
Liabilities:
Risk Management Liabilities	(187,311,000)				(187,311,000)				(280,661,000)
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	68,083,000	[10],[15]			68,083,000	[10],[15]			76,907,000	[10],[15]
Liabilities:
Risk Management Liabilities	37,628,000	[10],[15]			37,628,000	[10],[15]			37,111,000	[10],[15]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	4,301,000	[10],[15]			4,301,000	[10],[15]			4,680,000	[10],[15]
Liabilities:
Risk Management Liabilities	1,931,000	[10],[15]			1,931,000	[10],[15]			2,535,000	[10],[15]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	219,033,000	[10],[15]			219,033,000	[10],[15]			302,128,000	[10],[15]
Liabilities:
Risk Management Liabilities	209,732,000	[10],[15]			209,732,000	[10],[15]			291,194,000	[10],[15]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	23,357,000	[10],[15]			23,357,000	[10],[15]			25,423,000	[10],[15]
Liabilities:
Risk Management Liabilities	12,606,000	[10],[15]			12,606,000	[10],[15]			23,379,000	[10],[15]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(178,608,000)	[10],[15]			(178,608,000)	[10],[15]			(255,324,000)	[10],[15]
Liabilities:
Risk Management Liabilities	(186,641,000)	[10],[15]			(186,641,000)	[10],[15]			(279,997,000)	[10],[15]
Appalachian Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	21,300,000				21,300,000
Liabilities:
Risk Management Liabilities	10,451,000				10,451,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	10.45				10.45
Forward Price Range High	63.25				63.25
Appalachian Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	2,346,000				2,346,000
Liabilities:
Risk Management Liabilities	2,155,000				2,155,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(3.81)				(3.81)
Forward Price Range High	9.92				9.92
Appalachian Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	925,000	[10]			925,000	[10]			431,000	[10]
Liabilities:
Risk Management Liabilities	1,503,000	[10]			1,503,000	[10]			2,418,000	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,306,000	[10]			1,306,000	[10]			1,095,000	[10]
Liabilities:
Risk Management Liabilities	2,173,000	[10]			2,173,000	[10]			3,009,000	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	289,000	[10]			289,000	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			73,000	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(670,000)	[10]			(670,000)	[10]			(664,000)	[10]
Liabilities:
Risk Management Liabilities	(670,000)	[10]			(670,000)	[10]			(664,000)	[10]
Indiana Michigan Power Co [Member]
Risk Management Assets
Risk Management Assets	54,806,000				54,806,000				61,514,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,699,691,000				1,699,691,000				1,591,732,000
Total Assets	1,754,497,000				1,754,497,000				1,653,246,000
Liabilities:
Risk Management Liabilities	48,017,000				48,017,000				35,851,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	9,049,000		3,150,000		1,263,000		3,108,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(2,440,000)	[13],[4]	(2,904,000)	[13],[4]	(3,488,000)	[13],[4]	(1,401,000)	[13],[4]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[13]	0	[13]	0	[13]	0	[13]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	277,000		(7,000)		211,000		(29,000)
Purchases, Issuances and Settlements	635,000	[5]	297,000	[5]	7,325,000	[5]	1,656,000	[5]
Transfers into Level 3	460,000	[6],[7]	0	[6],[7]	2,749,000	[6],[7]	764,000	[6],[7]
Transfers out of Level 3	(202,000)	[7],[8]	(154,000)	[7],[8]	(3,193,000)	[7],[8]	(1,834,000)	[7],[8]
Changes in Fair Value Allocated to Regulated Jurisdictions	(193,000)	[14]	112,000	[14]	2,719,000	[14]	(1,770,000)	[14]
Ending Balance	7,586,000		494,000		7,586,000		494,000
Indiana Michigan Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	2,955,000				2,955,000				3,001,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	731,679,000				731,679,000				646,032,000
Total Assets	734,634,000				734,634,000				649,033,000
Liabilities:
Risk Management Liabilities	1,327,000				1,327,000				1,626,000
Indiana Michigan Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	155,461,000				155,461,000				203,877,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	960,062,000				960,062,000				932,902,000
Total Assets	1,115,523,000				1,115,523,000				1,136,779,000
Liabilities:
Risk Management Liabilities	163,811,000				163,811,000				197,630,000
Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	16,249,000				16,249,000				16,305,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	16,249,000				16,249,000				16,305,000
Liabilities:
Risk Management Liabilities	8,663,000				8,663,000				15,042,000
Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(119,859,000)				(119,859,000)				(161,669,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	7,950,000				7,950,000				12,798,000
Total Assets	(111,909,000)				(111,909,000)				(148,871,000)
Liabilities:
Risk Management Liabilities	(125,784,000)				(125,784,000)				(178,447,000)
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	53,778,000	[10],[15]			53,778,000	[10],[15]			60,254,000	[10],[15]
Liabilities:
Risk Management Liabilities	26,520,000	[10],[15]			26,520,000	[10],[15]			23,691,000	[10],[15]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	2,955,000	[10],[15]			2,955,000	[10],[15]			3,001,000	[10],[15]
Liabilities:
Risk Management Liabilities	1,327,000	[10],[15]			1,327,000	[10],[15]			1,626,000	[10],[15]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	154,581,000	[10],[15]			154,581,000	[10],[15]			203,175,000	[10],[15]
Liabilities:
Risk Management Liabilities	141,858,000	[10],[15]			141,858,000	[10],[15]			185,092,000	[10],[15]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	16,051,000	[10],[15]			16,051,000	[10],[15]			16,305,000	[10],[15]
Liabilities:
Risk Management Liabilities	8,663,000	[10],[15]			8,663,000	[10],[15]			14,995,000	[10],[15]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(119,809,000)	[10],[15]			(119,809,000)	[10],[15]			(162,227,000)	[10],[15]
Liabilities:
Risk Management Liabilities	(125,328,000)	[10],[15]			(125,328,000)	[10],[15]			(178,022,000)	[10],[15]
Indiana Michigan Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	14,637,000				14,637,000
Liabilities:
Risk Management Liabilities	7,182,000				7,182,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	10.45				10.45
Forward Price Range High	63.25				63.25
Indiana Michigan Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	1,612,000				1,612,000
Liabilities:
Risk Management Liabilities	1,481,000				1,481,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(3.81)				(3.81)
Forward Price Range High	9.92				9.92
Indiana Michigan Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	622,000	[10]			622,000	[10]			277,000	[10]
Liabilities:
Risk Management Liabilities	1,032,000	[10]			1,032,000	[10]			1,523,000	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	880,000	[10]			880,000	[10]			702,000	[10]
Liabilities:
Risk Management Liabilities	1,488,000	[10]			1,488,000	[10]			1,901,000	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	198,000	[10]			198,000	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			47,000	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(456,000)	[10]			(456,000)	[10]			(425,000)	[10]
Liabilities:
Risk Management Liabilities	(456,000)	[10]			(456,000)	[10]			(425,000)	[10]
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member]
Liabilities:
Risk Management Liabilities	20,465,000				20,465,000				10,637,000
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 1 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 2 [Member]
Liabilities:
Risk Management Liabilities	20,465,000				20,465,000				10,637,000
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 3 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Ohio Power Co [Member]
Assets:
Cash and Cash Equivalents	65,000	[16]			65,000	[16]			48,000	[16]
Risk Management Assets
Risk Management Assets	99,031,000				99,031,000				107,907,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	99,096,000				99,096,000				107,955,000
Liabilities:
Risk Management Liabilities	56,171,000				56,171,000				54,451,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	18,969,000		6,759,000		2,666,000		6,583,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(5,024,000)	[13],[4]	(6,138,000)	[13],[4]	(7,316,000)	[13],[4]	(3,007,000)	[13],[4]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	(1,030,000)	[13]	(939,000)	[13]	4,973,000	[13]	1,947,000	[13]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	571,000		(13,000)		435,000		(61,000)
Purchases, Issuances and Settlements	1,299,000	[5]	599,000	[5]	15,375,000	[5]	3,567,000	[5]
Transfers into Level 3	964,000	[6],[7]	0	[6],[7]	5,789,000	[6],[7]	1,638,000	[6],[7]
Transfers out of Level 3	(423,000)	[7],[8]	(330,000)	[7],[8]	(6,733,000)	[7],[8]	(3,908,000)	[7],[8]
Changes in Fair Value Allocated to Regulated Jurisdictions	253,000	[14]	1,103,000	[14]	390,000	[14]	(5,718,000)	[14]
Ending Balance	15,579,000		1,041,000		15,579,000		1,041,000
Ohio Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	0	[16]			0	[16]			26,000	[16]
Risk Management Assets
Risk Management Assets	6,069,000				6,069,000				6,339,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	6,069,000				6,069,000				6,365,000
Liabilities:
Risk Management Liabilities	2,726,000				2,726,000				3,433,000
Ohio Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	26,000	[16]			26,000	[16]			0	[16]
Risk Management Assets
Risk Management Assets	320,325,000				320,325,000				422,732,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	320,351,000				320,351,000				422,732,000
Liabilities:
Risk Management Liabilities	308,555,000				308,555,000				410,297,000
Ohio Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[16]			0	[16]			0	[16]
Risk Management Assets
Risk Management Assets	33,369,000				33,369,000				34,425,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	33,369,000				33,369,000				34,425,000
Liabilities:
Risk Management Liabilities	17,790,000				17,790,000				31,759,000
Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	39,000	[16]			39,000	[16]			22,000	[16]
Risk Management Assets
Risk Management Assets	(260,732,000)				(260,732,000)				(355,589,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(260,693,000)				(260,693,000)				(355,567,000)
Liabilities:
Risk Management Liabilities	(272,900,000)				(272,900,000)				(391,038,000)
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	96,909,000	[10],[15]			96,909,000	[10],[15]			105,247,000	[10],[15]
Liabilities:
Risk Management Liabilities	54,051,000	[10],[15]			54,051,000	[10],[15]			51,212,000	[10],[15]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	6,069,000	[10],[15]			6,069,000	[10],[15]			6,339,000	[10],[15]
Liabilities:
Risk Management Liabilities	2,726,000	[10],[15]			2,726,000	[10],[15]			3,433,000	[10],[15]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	318,501,000	[10],[15]			318,501,000	[10],[15]			421,249,000	[10],[15]
Liabilities:
Risk Management Liabilities	305,493,000	[10],[15]			305,493,000	[10],[15]			406,259,000	[10],[15]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	32,962,000	[10],[15]			32,962,000	[10],[15]			34,425,000	[10],[15]
Liabilities:
Risk Management Liabilities	17,790,000	[10],[15]			17,790,000	[10],[15]			31,659,000	[10],[15]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(260,623,000)	[10],[15]			(260,623,000)	[10],[15]			(356,766,000)	[10],[15]
Liabilities:
Risk Management Liabilities	(271,958,000)	[10],[15]			(271,958,000)	[10],[15]			(390,139,000)	[10],[15]
Ohio Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	30,058,000				30,058,000
Liabilities:
Risk Management Liabilities	14,748,000				14,748,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	10.45				10.45
Forward Price Range High	63.25				63.25
Ohio Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	3,311,000				3,311,000
Liabilities:
Risk Management Liabilities	3,042,000				3,042,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(3.81)				(3.81)
Forward Price Range High	9.92				9.92
Ohio Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	1,289,000	[10]			1,289,000	[10]			584,000	[10]
Liabilities:
Risk Management Liabilities	2,120,000	[10]			2,120,000	[10]			3,239,000	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,824,000	[10]			1,824,000	[10]			1,483,000	[10]
Liabilities:
Risk Management Liabilities	3,062,000	[10]			3,062,000	[10]			4,038,000	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	407,000	[10]			407,000	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			100,000	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(942,000)	[10]			(942,000)	[10]			(899,000)	[10]
Liabilities:
Risk Management Liabilities	(942,000)	[10]			(942,000)	[10]			(899,000)	[10]
Public Service Co Of Oklahoma [Member]
Risk Management Assets
Risk Management Assets	669,000				669,000				879,000
Liabilities:
Risk Management Liabilities	6,122,000				6,122,000				2,610,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	0		0		0		1,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	0	[13],[4]	0	[13],[4]	0	[13],[4]	0	[13],[4]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[13]	0	[13]	0	[13]	0	[13]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0		0		0
Purchases, Issuances and Settlements	0	[5]	0	[5]	0	[5]	0	[5]
Transfers into Level 3	0	[6],[7]	0	[6],[7]	0	[6],[7]	0	[6],[7]
Transfers out of Level 3	0	[7],[8]	0	[7],[8]	0	[7],[8]	0	[7],[8]
Changes in Fair Value Allocated to Regulated Jurisdictions	0	[14]	0	[14]	0	[14]	(1,000)	[14]
Ending Balance	0		0		0		0
Public Service Co Of Oklahoma [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	8,000				8,000
Liabilities:
Risk Management Liabilities	6,000				6,000				53,000
Public Service Co Of Oklahoma [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	5,184,000				5,184,000
Liabilities:
Risk Management Liabilities	10,643,000				10,643,000				9,649,000
Public Service Co Of Oklahoma [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0				0
Liabilities:
Risk Management Liabilities	0				0				0
Public Service Co Of Oklahoma [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(4,523,000)				(4,523,000)
Liabilities:
Risk Management Liabilities	(4,527,000)				(4,527,000)				(7,092,000)
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	623,000	[10],[15]			623,000	[10],[15]			879,000	[10],[15]
Liabilities:
Risk Management Liabilities	6,116,000	[10],[15]			6,116,000	[10],[15]			2,503,000	[10],[15]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	8,000	[10],[15]			8,000	[10],[15]			97,000	[10],[15]
Liabilities:
Risk Management Liabilities	6,000	[10],[15]			6,000	[10],[15]			53,000	[10],[15]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	5,126,000	[10],[15]			5,126,000	[10],[15]			7,797,000	[10],[15]
Liabilities:
Risk Management Liabilities	10,625,000	[10],[15]			10,625,000	[10],[15]			9,542,000	[10],[15]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10],[15]			0	[10],[15]			0	[10],[15]
Liabilities:
Risk Management Liabilities	0	[10],[15]			0	[10],[15]			0	[10],[15]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(4,511,000)	[10],[15]			(4,511,000)	[10],[15]			(7,015,000)	[10],[15]
Liabilities:
Risk Management Liabilities	(4,515,000)	[10],[15]			(4,515,000)	[10],[15]			(7,092,000)	[10],[15]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	46,000	[10]			46,000	[10]
Liabilities:
Risk Management Liabilities	6,000	[10]			6,000	[10]			107,000
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	58,000	[10]			58,000	[10]
Liabilities:
Risk Management Liabilities	18,000	[10]			18,000	[10]			107,000
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(12,000)	[10]			(12,000)	[10]
Liabilities:
Risk Management Liabilities	(12,000)	[10]			(12,000)	[10]			0
Southwestern Electric Power Co [Member]
Assets:
Cash and Cash Equivalents	16,626,000	[16]			16,626,000	[16]
Risk Management Assets
Risk Management Assets	883,000				883,000				727,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	17,509,000				17,509,000
Liabilities:
Risk Management Liabilities	4,282,000				4,282,000				24,580,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	0		0		0		2,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	0	[13],[4]	0	[13],[4]	0	[13],[4]	0	[13],[4]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[13]	0	[13]	0	[13]	0	[13]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0		0		0
Purchases, Issuances and Settlements	0	[5]	0	[5]	0	[5]	0	[5]
Transfers into Level 3	0	[6],[7]	0	[6],[7]	0	[6],[7]	0	[6],[7]
Transfers out of Level 3	0	[7],[8]	0	[7],[8]	0	[7],[8]	0	[7],[8]
Changes in Fair Value Allocated to Regulated Jurisdictions	0	[14]	0	[14]	0	[14]	(2,000)	[14]
Ending Balance	0		0		0		0
Southwestern Electric Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	14,108,000	[16]			14,108,000	[16]
Risk Management Assets
Risk Management Assets	9,000				9,000				122,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	14,117,000				14,117,000
Liabilities:
Risk Management Liabilities	7,000				7,000				66,000
Southwestern Electric Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	[16]			0	[16]
Risk Management Assets
Risk Management Assets	8,358,000				8,358,000				7,026,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	8,358,000				8,358,000
Liabilities:
Risk Management Liabilities	11,762,000				11,762,000				30,993,000
Southwestern Electric Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[16]			0	[16]
Risk Management Assets
Risk Management Assets	0				0				0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	0				0
Liabilities:
Risk Management Liabilities	0				0				0
Southwestern Electric Power Co [Member] | Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	2,518,000	[16]			2,518,000	[16]
Risk Management Assets
Risk Management Assets	(7,484,000)				(7,484,000)				(6,421,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(4,966,000)				(4,966,000)
Liabilities:
Risk Management Liabilities	(7,487,000)				(7,487,000)				(6,479,000)
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	840,000	[10],[15]			840,000	[10],[15]			724,000	[10],[15]
Liabilities:
Risk Management Liabilities	4,276,000	[10],[15]			4,276,000	[10],[15]			5,340,000	[10],[15]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	9,000	[10],[15]			9,000	[10],[15]			122,000	[10],[15]
Liabilities:
Risk Management Liabilities	7,000	[10],[15]			7,000	[10],[15]			66,000	[10],[15]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	8,303,000	[10],[15]			8,303,000	[10],[15]			7,023,000	[10],[15]
Liabilities:
Risk Management Liabilities	11,744,000	[10],[15]			11,744,000	[10],[15]			11,753,000	[10],[15]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10],[15]			0	[10],[15]			0	[10],[15]
Liabilities:
Risk Management Liabilities	0	[10],[15]			0	[10],[15]			0	[10],[15]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(7,472,000)	[10],[15]			(7,472,000)	[10],[15]			(6,421,000)	[10],[15]
Liabilities:
Risk Management Liabilities	(7,475,000)	[10],[15]			(7,475,000)	[10],[15]			(6,479,000)	[10],[15]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	43,000	[10]			43,000	[10]
Liabilities:
Risk Management Liabilities	6,000	[10]			6,000	[10]			97,000
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	55,000	[10]			55,000	[10]
Liabilities:
Risk Management Liabilities	18,000	[10]			18,000	[10]			97,000
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(12,000)	[10]			(12,000)	[10]
Liabilities:
Risk Management Liabilities	(12,000)	[10]			(12,000)	[10]			0
Southwestern Electric Power Co [Member] | Interest Rate Foreign Currency Hedges [Member]
Risk Management Assets
Risk Management Assets									3,000
Liabilities:
Risk Management Liabilities									19,143,000
Southwestern Electric Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets									0
Liabilities:
Risk Management Liabilities									0
Southwestern Electric Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets									3,000
Liabilities:
Risk Management Liabilities									19,143,000
Southwestern Electric Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets									0
Liabilities:
Risk Management Liabilities									0
Southwestern Electric Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets									0
Liabilities:
Risk Management Liabilities									0
Cash [Member]
Assets:
Other Temporary Investments	197,000,000	[1],[2]			197,000,000	[1],[2]			216,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13,000,000	[2]			13,000,000	[2]			18,000,000	[2]
Cash [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	183,000,000	[1],[2]			183,000,000	[1],[2]			191,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[2]			0	[2]			0	[2]
Cash [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	5,000,000	[1],[2]			5,000,000	[1],[2]			0	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	5,000,000	[2]			5,000,000	[2]			5,000,000	[2]
Cash [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0	[1],[2]			0	[1],[2]			0	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[2]			0	[2]			0	[2]
Cash [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	9,000,000	[1],[2]			9,000,000	[1],[2]			25,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,000,000	[2]			8,000,000	[2]			13,000,000	[2]
Cash [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	12,945,000	[2]			12,945,000	[2]			18,229,000	[2]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[2]			0	[2]			0	[2]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	4,995,000	[2]			4,995,000	[2]			5,431,000	[2]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[2]			0	[2]			0	[2]
Cash [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	7,950,000	[2]			7,950,000	[2]			12,798,000	[2]
Fixed Income Funds [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	955,000,000				955,000,000				928,000,000
Fixed Income Funds [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Fixed Income Funds [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	955,000,000				955,000,000				928,000,000
Fixed Income Funds [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Fixed Income Funds [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	955,067,000				955,067,000				927,471,000
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	955,067,000				955,067,000				927,471,000
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Mutual Funds Fixed Income [Member]
Assets:
Other Temporary Investments	65,000,000				65,000,000				64,000,000
Mutual Funds Fixed Income [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	65,000,000				65,000,000				64,000,000
Mutual Funds Fixed Income [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	0				0				0
Mutual Funds Fixed Income [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0				0				0
Mutual Funds Fixed Income [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	0				0				0
Variable Rate Demand Notes [Member]
Assets:
Other Temporary Investments	0				0				0
Domestic [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	732,000,000	[17]			732,000,000	[17]			646,000,000	[17]
Domestic [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	732,000,000	[17]			732,000,000	[17]			646,000,000	[17]
Domestic [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Domestic [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Domestic [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Domestic [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	731,679,000	[17]			731,679,000	[17]			646,032,000	[17]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	731,679,000	[17]			731,679,000	[17]			646,032,000	[17]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Domestic [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Mutual Funds Equity [Member]
Assets:
Other Temporary Investments	16,000,000	[17]			16,000,000	[17]			14,000,000	[17]
Mutual Funds Equity [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	16,000,000	[17]			16,000,000	[17]			14,000,000	[17]
Mutual Funds Equity [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	0	[17]			0	[17]			0	[17]
Mutual Funds Equity [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0	[17]			0	[17]			0	[17]
Mutual Funds Equity [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	0	[17]			0	[17]			0	[17]
Cash and Cash Equivalents [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13,000,000				13,000,000				18,000,000
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	12,945,000				12,945,000				18,229,000
US Government Agencies Debt Securities [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	693,000,000				693,000,000				544,000,000
US Government Agencies Debt Securities [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
US Government Agencies Debt Securities [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	693,000,000				693,000,000				544,000,000
US Government Agencies Debt Securities [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
US Government Agencies Debt Securities [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	693,127,000				693,127,000				543,506,000
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	693,127,000				693,127,000				543,506,000
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Corporate Debt [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	36,000,000				36,000,000				54,000,000
Corporate Debt [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Corporate Debt [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	36,000,000				36,000,000				54,000,000
Corporate Debt [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Corporate Debt [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Corporate Debt [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	35,798,000				35,798,000				53,979,000
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	35,798,000				35,798,000				53,979,000
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
State and Local Jurisdiction [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	226,000,000				226,000,000				330,000,000
State and Local Jurisdiction [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
State and Local Jurisdiction [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	226,000,000				226,000,000				330,000,000
State and Local Jurisdiction [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
State and Local Jurisdiction [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	226,142,000				226,142,000				329,986,000
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	226,142,000				226,142,000				329,986,000
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Dedesignated Risk Management Contracts [Member]
Risk Management Assets
Risk Management Assets	19,000,000	[18]			19,000,000	[18]			28,000,000	[18]
Dedesignated Risk Management Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	19,000,000	[18]			19,000,000	[18]			28,000,000	[18]
Dedesignated Risk Management Contracts [Member] | Appalachian Power Co [Member]
Risk Management Assets
Risk Management Assets	590,000	[18]			590,000	[18]			1,533,000	[18]
Dedesignated Risk Management Contracts [Member] | Appalachian Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Appalachian Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Appalachian Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	590,000	[18]			590,000	[18]			1,533,000	[18]
Dedesignated Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Risk Management Assets
Risk Management Assets	406,000	[18]			406,000	[18]			983,000	[18]
Dedesignated Risk Management Contracts [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	406,000	[18]			406,000	[18]			983,000	[18]
Dedesignated Risk Management Contracts [Member] | Ohio Power Co [Member]
Risk Management Assets
Risk Management Assets	833,000	[18]			833,000	[18]			2,076,000	[18]
Dedesignated Risk Management Contracts [Member] | Ohio Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Ohio Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Ohio Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	$ 833,000	[18]			$ 833,000	[18]			$ 2,076,000	[18]

[1] Amounts in ''Other'' column primarily represent cash deposits in bank accounts with financial institutions or with third parties. Level 1 amounts primarily represent investments in money market funds.

[2] Amounts in ''Other'' column primarily represent accrued interest receivables from financial institutions. Level 2 amounts primarily represent investments in money market funds.

[3] Included in revenues on our condensed statements of income.

[4] Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

[5] Represents the settlement of risk management commodity contracts for the reporting period.

[6] Represents existing assets or liabilities that were previously categorized as Level 2.

[7] Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

[8] Represents existing assets or liabilities that were previously categorized as Level 3.

[9] Relates to the net gains (losses) of those contracts that are not reflected on our condensed statements of income. These net gains (losses) are recorded as regulatory liabilities/assets

[10] Amounts in ''Other'' column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for ''Derivatives and Hedging.''

[11] The September 30, 2012 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $12 million in periods 2013-2015 and ($7) million in periods 2016-2018; Level 2 matures $59 million in periods 2013-2015, $14 million in periods 2016-2017 and $9 million in periods 2018-2030; Level 3 matures $7 million in 2012, $35 million in periods 2013-2015, $31 million in periods 2016-2017 and $29 million in periods 2018-2030. Risk management commodity contracts are substantially comprised of power contracts.

[12] The December 31, 2011 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $3 million in 2012, $7 million in periods 2013-2015 and ($6) million in periods 2016-2018; Level 2 matures $21 million in 2012, $50 million in periods 2013-2015, $11 million in periods 2016-2017 and $8 million in periods 2018-2030; Level 3 matures ($19) million in 2012, $44 million in periods 2013-2015, $18 million in periods 2016-2017 and $26 million in periods 2018-2030. Risk management commodity contracts are substantially comprised of power contracts.

[13] Included in revenues on the condensed statements of income.

[14] Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income. These net gains (losses) are recorded as regulatory assets/liabilities.

[15] Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

[16] Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.

[17] Amounts represent publicly traded equity securities and equity-based mutual funds.

[18] Represents contracts that were originally MTM but were subsequently elected as normal under the accounting guidance for ''Derivatives and Hedging.'' At the time of the normal election, the MTM value was frozen and no longer fair valued. This MTM value will be amortized into revenues over the remaining life of the contracts.