Fair Value Financial Assets Liabilities (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Assets:
Cash and Cash Equivalents	$ 297,000,000	[1]			$ 297,000,000	[1]			$ 221,000,000	[1]
Other Temporary Investments	297,000,000				297,000,000				294,000,000
Risk Management Assets
Risk Management Assets	658,000,000				658,000,000				596,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,658,000,000				1,658,000,000				1,592,000,000
Total Assets	2,910,000,000				2,910,000,000				2,703,000,000
Liabilities:
Risk Management Liabilities	424,000,000				424,000,000				345,000,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	92,000,000		73,000,000		69,000,000		85,000,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(11,000,000)	[2],[3]	(10,000,000)	[2],[3]	(17,000,000)	[2],[3]	(9,000,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	4,000,000	[2]	10,000,000	[2]	5,000,000	[2]	7,000,000	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0		0		0
Purchases, Issuances and Settlements	15,000,000	[4]	14,000,000	[4]	33,000,000	[4]	6,000,000	[4]
Transfers into Level 3	(1,000,000)	[5],[6]	3,000,000	[5],[6]	14,000,000	[5],[6]	4,000,000	[5],[6]
Transfers out of Level 3	(8,000,000)	[6],[7]	(4,000,000)	[6],[7]	(20,000,000)	[6],[7]	(12,000,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	6,000,000	[8]	(9,000,000)	[8]	13,000,000	[8]	(4,000,000)	[8]
Ending Balance	97,000,000		77,000,000		97,000,000		77,000,000
Level 1 [Member]
Assets:
Cash and Cash Equivalents	20,000,000	[1]			20,000,000	[1]			6,000,000	[1]
Other Temporary Investments	266,000,000				266,000,000				269,000,000
Risk Management Assets
Risk Management Assets	66,000,000				66,000,000				62,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	698,000,000				698,000,000				646,000,000
Total Assets	1,050,000,000				1,050,000,000				983,000,000
Liabilities:
Risk Management Liabilities	47,000,000				47,000,000				43,000,000
Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]			0	[1]
Other Temporary Investments	0				0				0
Risk Management Assets
Risk Management Assets	1,549,000,000				1,549,000,000				1,322,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	948,000,000				948,000,000				933,000,000
Total Assets	2,497,000,000				2,497,000,000				2,255,000,000
Liabilities:
Risk Management Liabilities	1,528,000,000				1,528,000,000				1,294,000,000
Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]			0	[1]
Other Temporary Investments	0				0				0
Risk Management Assets
Risk Management Assets	164,000,000				164,000,000				147,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	164,000,000				164,000,000				147,000,000
Liabilities:
Risk Management Liabilities	67,000,000				67,000,000				78,000,000
Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	277,000,000	[1]			277,000,000	[1]			215,000,000	[1]
Other Temporary Investments	31,000,000				31,000,000				25,000,000
Risk Management Assets
Risk Management Assets	(1,121,000,000)				(1,121,000,000)				(935,000,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	12,000,000				12,000,000				13,000,000
Total Assets	(801,000,000)				(801,000,000)				(682,000,000)
Liabilities:
Risk Management Liabilities	(1,218,000,000)				(1,218,000,000)				(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	2,000,000				2,000,000				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	12,000,000				12,000,000				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	52,000,000				52,000,000				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	38,000,000				38,000,000				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	(8,000,000)				(8,000,000)				(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	17,000,000				17,000,000				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	24,000,000				24,000,000				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	27,000,000				27,000,000				26,000,000
Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	597,000,000	[10],[9]			597,000,000	[10],[9]			548,000,000	[11],[9]
Liabilities:
Risk Management Liabilities	329,000,000	[10],[9]			329,000,000	[10],[9]			278,000,000	[11],[9]
Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	53,000,000	[10],[9]			53,000,000	[10],[9]			47,000,000	[11],[9]
Liabilities:
Risk Management Liabilities	47,000,000	[10],[9]			47,000,000	[10],[9]			43,000,000	[11],[9]
Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,509,000,000	[10],[9]			1,509,000,000	[10],[9]			1,299,000,000	[11],[9]
Liabilities:
Risk Management Liabilities	1,419,000,000	[10],[9]			1,419,000,000	[10],[9]			1,209,000,000	[11],[9]
Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	163,000,000	[10],[9]			163,000,000	[10],[9]			147,000,000	[11],[9]
Liabilities:
Risk Management Liabilities	67,000,000	[10],[9]			67,000,000	[10],[9]			78,000,000	[11],[9]
Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(1,128,000,000)	[10],[9]			(1,128,000,000)	[10],[9]			(945,000,000)	[11],[9]
Liabilities:
Risk Management Liabilities	(1,204,000,000)	[10],[9]			(1,204,000,000)	[10],[9]			(1,052,000,000)	[11],[9]
Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	152,000,000				152,000,000
Liabilities:
Risk Management Liabilities	60,000,000				60,000,000
Forward Price Range
Low	10.76				10.76
High	174.18				174.18
Financial Trasnsmission Rights [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	12,000,000				12,000,000
Liabilities:
Risk Management Liabilities	7,000,000				7,000,000
Forward Price Range
Low	(10.77)				(10.77)
High	10.78				10.78
Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	38,000,000	[9]			38,000,000	[9]			20,000,000	[9]
Liabilities:
Risk Management Liabilities	60,000,000	[9]			60,000,000	[9]			25,000,000	[9]
Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	13,000,000	[9]			13,000,000	[9]			15,000,000	[9]
Liabilities:
Risk Management Liabilities	0	[9]			0	[9]			0	[9]
Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	38,000,000	[9]			38,000,000	[9]			23,000,000	[9]
Liabilities:
Risk Management Liabilities	74,000,000	[9]			74,000,000	[9]			43,000,000	[9]
Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	1,000,000	[9]			1,000,000	[9]			0	[9]
Liabilities:
Risk Management Liabilities	0	[9]			0	[9]			0	[9]
Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(14,000,000)	[9]			(14,000,000)	[9]			(18,000,000)	[9]
Liabilities:
Risk Management Liabilities	(14,000,000)	[9]			(14,000,000)	[9]			(18,000,000)	[9]
Interest Rate Foreign Currency Hedges [Member]
Liabilities:
Risk Management Liabilities	35,000,000				35,000,000				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	35,000,000				35,000,000				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	86,517,000				86,517,000				78,871,000
Liabilities:
Risk Management Liabilities	45,674,000				45,674,000				39,529,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	7,981,000		5,472,000		1,971,000		5,131,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(3,210,000)	[12],[3]	(3,219,000)	[12],[3]	(5,313,000)	[12],[3]	(2,489,000)	[12],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[12]	0	[12]	0	[12]	0	[12]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(11,000)		(50,000)		52,000		(50,000)
Purchases, Issuances and Settlements	4,988,000	[4]	4,814,000	[4]	11,499,000	[4]	3,881,000	[4]
Transfers into Level 3	1,301,000	[5],[6]	1,125,000	[5],[6]	3,562,000	[5],[6]	1,221,000	[5],[6]
Transfers out of Level 3	(557,000)	[6],[7]	(213,000)	[6],[7]	(4,676,000)	[6],[7]	(2,853,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	2,372,000	[13]	(2,608,000)	[13]	5,769,000	[13]	480,000	[13]
Ending Balance	12,864,000		5,321,000		12,864,000		5,321,000
Appalachian Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	5,566,000				5,566,000				4,680,000
Liabilities:
Risk Management Liabilities	2,784,000				2,784,000				2,535,000
Appalachian Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	332,495,000				332,495,000				303,223,000
Liabilities:
Risk Management Liabilities	325,178,000				325,178,000				294,203,000
Appalachian Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	27,674,000				27,674,000				25,423,000
Liabilities:
Risk Management Liabilities	14,810,000				14,810,000				23,452,000
Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(279,218,000)				(279,218,000)				(254,455,000)
Liabilities:
Risk Management Liabilities	(297,098,000)				(297,098,000)				(280,661,000)
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	84,677,000	[14],[9]			84,677,000	[14],[9]			76,907,000	[14],[9]
Liabilities:
Risk Management Liabilities	41,903,000	[14],[9]			41,903,000	[14],[9]			37,111,000	[14],[9]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	5,566,000	[14],[9]			5,566,000	[14],[9]			4,680,000	[14],[9]
Liabilities:
Risk Management Liabilities	2,784,000	[14],[9]			2,784,000	[14],[9]			2,535,000	[14],[9]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	331,309,000	[14],[9]			331,309,000	[14],[9]			302,128,000	[14],[9]
Liabilities:
Risk Management Liabilities	321,155,000	[14],[9]			321,155,000	[14],[9]			291,194,000	[14],[9]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	27,645,000	[14],[9]			27,645,000	[14],[9]			25,423,000	[14],[9]
Liabilities:
Risk Management Liabilities	14,810,000	[14],[9]			14,810,000	[14],[9]			23,379,000	[14],[9]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(279,843,000)	[14],[9]			(279,843,000)	[14],[9]			(255,324,000)	[14],[9]
Liabilities:
Risk Management Liabilities	(296,846,000)	[14],[9]			(296,846,000)	[14],[9]			(279,997,000)	[14],[9]
Appalachian Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	24,551,000				24,551,000
Liabilities:
Risk Management Liabilities	12,881,000				12,881,000
Forward Price Range
Low	10.76				10.76
High	161.12				161.12
Appalachian Power Co [Member] | Financial Trasnsmission Rights [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	3,123,000				3,123,000
Liabilities:
Risk Management Liabilities	1,929,000				1,929,000
Forward Price Range
Low	(4.02)				(4.02)
High	10.78				10.78
Appalachian Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	963,000	[9]			963,000	[9]			431,000	[9]
Liabilities:
Risk Management Liabilities	3,771,000	[9]			3,771,000	[9]			2,418,000	[9]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[9]			0	[9]			0	[9]
Liabilities:
Risk Management Liabilities	0	[9]			0	[9]			0	[9]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,186,000	[9]			1,186,000	[9]			1,095,000	[9]
Liabilities:
Risk Management Liabilities	4,023,000	[9]			4,023,000	[9]			3,009,000	[9]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	29,000	[9]			29,000	[9]			0	[9]
Liabilities:
Risk Management Liabilities	0	[9]			0	[9]			73,000	[9]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(252,000)	[9]			(252,000)	[9]			(664,000)	[9]
Liabilities:
Risk Management Liabilities	(252,000)	[9]			(252,000)	[9]			(664,000)	[9]
Indiana Michigan Power Co [Member]
Risk Management Assets
Risk Management Assets	70,466,000				70,466,000				61,514,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,657,502,000				1,657,502,000				1,591,732,000
Total Assets	1,727,968,000				1,727,968,000				1,653,246,000
Liabilities:
Risk Management Liabilities	50,147,000				50,147,000				35,851,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	5,614,000		3,209,000		1,263,000		3,108,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(2,258,000)	[12],[3]	(1,910,000)	[12],[3]	(3,590,000)	[12],[3]	(1,473,000)	[12],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[12]	0	[12]	0	[12]	0	[12]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(8,000)		(30,000)		34,000		(30,000)
Purchases, Issuances and Settlements	3,508,000	[4]	2,856,000	[4]	7,811,000	[4]	2,311,000	[4]
Transfers into Level 3	915,000	[5],[6]	661,000	[5],[6]	2,341,000	[5],[6]	718,000	[5],[6]
Transfers out of Level 3	(392,000)	[6],[7]	(125,000)	[6],[7]	(3,028,000)	[6],[7]	(1,713,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	1,670,000	[13]	(1,511,000)	[13]	4,218,000	[13]	229,000	[13]
Ending Balance	9,049,000		3,150,000		9,049,000		3,150,000
Indiana Michigan Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	3,915,000				3,915,000				3,001,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	697,407,000				697,407,000				646,032,000
Total Assets	701,322,000				701,322,000				649,033,000
Liabilities:
Risk Management Liabilities	1,958,000				1,958,000				1,626,000
Indiana Michigan Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	242,925,000				242,925,000				203,877,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	948,253,000				948,253,000				932,902,000
Total Assets	1,191,178,000				1,191,178,000				1,136,779,000
Liabilities:
Risk Management Liabilities	246,148,000				246,148,000				197,630,000
Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	19,466,000				19,466,000				16,305,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	19,466,000				19,466,000				16,305,000
Liabilities:
Risk Management Liabilities	10,417,000				10,417,000				15,042,000
Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(195,840,000)				(195,840,000)				(161,669,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	11,842,000				11,842,000				12,798,000
Total Assets	(183,998,000)				(183,998,000)				(148,871,000)
Liabilities:
Risk Management Liabilities	(208,376,000)				(208,376,000)				(178,447,000)
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	69,172,000	[14],[9]			69,172,000	[14],[9]			60,254,000	[14],[9]
Liabilities:
Risk Management Liabilities	29,446,000	[14],[9]			29,446,000	[14],[9]			23,691,000	[14],[9]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	3,915,000	[14],[9]			3,915,000	[14],[9]			3,001,000	[14],[9]
Liabilities:
Risk Management Liabilities	1,958,000	[14],[9]			1,958,000	[14],[9]			1,626,000	[14],[9]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	242,091,000	[14],[9]			242,091,000	[14],[9]			203,175,000	[14],[9]
Liabilities:
Risk Management Liabilities	225,269,000	[14],[9]			225,269,000	[14],[9]			185,092,000	[14],[9]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	19,445,000	[14],[9]			19,445,000	[14],[9]			16,305,000	[14],[9]
Liabilities:
Risk Management Liabilities	10,417,000	[14],[9]			10,417,000	[14],[9]			14,995,000	[14],[9]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(196,279,000)	[14],[9]			(196,279,000)	[14],[9]			(162,227,000)	[14],[9]
Liabilities:
Risk Management Liabilities	(208,198,000)	[14],[9]			(208,198,000)	[14],[9]			(178,022,000)	[14],[9]
Indiana Michigan Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	17,269,000				17,269,000
Liabilities:
Risk Management Liabilities	9,060,000				9,060,000
Forward Price Range
Low	10.76				10.76
High	161.12				161.12
Indiana Michigan Power Co [Member] | Financial Trasnsmission Rights [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	2,197,000				2,197,000
Liabilities:
Risk Management Liabilities	1,357,000				1,357,000
Forward Price Range
Low	(4.02)				(4.02)
High	10.78				10.78
Indiana Michigan Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	677,000	[9]			677,000	[9]			277,000	[9]
Liabilities:
Risk Management Liabilities	2,606,000	[9]			2,606,000	[9]			1,523,000	[9]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[9]			0	[9]			0	[9]
Liabilities:
Risk Management Liabilities	0	[9]			0	[9]			0	[9]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	834,000	[9]			834,000	[9]			702,000	[9]
Liabilities:
Risk Management Liabilities	2,784,000	[9]			2,784,000	[9]			1,901,000	[9]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	21,000	[9]			21,000	[9]			0	[9]
Liabilities:
Risk Management Liabilities	0	[9]			0	[9]			47,000	[9]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(178,000)	[9]			(178,000)	[9]			(425,000)	[9]
Liabilities:
Risk Management Liabilities	(178,000)	[9]			(178,000)	[9]			(425,000)	[9]
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member]
Liabilities:
Risk Management Liabilities	18,095,000				18,095,000				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	18,095,000				18,095,000				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	[15]			65,000	[15]			48,000	[15]
Risk Management Assets
Risk Management Assets	129,252,000				129,252,000				107,907,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	129,317,000				129,317,000				107,955,000
Liabilities:
Risk Management Liabilities	68,894,000				68,894,000				54,451,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	11,767,000		6,893,000		2,666,000		6,583,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(4,734,000)	[12],[3]	(4,096,000)	[12],[3]	(7,533,000)	[12],[3]	(3,158,000)	[12],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	1,711,000	[12]	1,149,000	[12]	7,035,000	[12]	4,949,000	[12]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(16,000)		(64,000)		71,000		(64,000)
Purchases, Issuances and Settlements	7,355,000	[4]	6,126,000	[4]	16,397,000	[4]	4,955,000	[4]
Transfers into Level 3	1,919,000	[5],[6]	1,417,000	[5],[6]	4,934,000	[5],[6]	1,539,000	[5],[6]
Transfers out of Level 3	(821,000)	[6],[7]	(269,000)	[6],[7]	(6,388,000)	[6],[7]	(3,648,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	1,788,000	[13]	(4,397,000)	[13]	1,787,000	[13]	(4,397,000)	[13]
Ending Balance	18,969,000		6,759,000		18,969,000		6,759,000
Ohio Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	0	[15]			0	[15]			26,000	[15]
Risk Management Assets
Risk Management Assets	8,207,000				8,207,000				6,339,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	8,207,000				8,207,000				6,365,000
Liabilities:
Risk Management Liabilities	4,106,000				4,106,000				3,433,000
Ohio Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	26,000	[15]			26,000	[15]			0	[15]
Risk Management Assets
Risk Management Assets	506,232,000				506,232,000				422,732,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	506,258,000				506,258,000				422,732,000
Liabilities:
Risk Management Liabilities	495,256,000				495,256,000				410,297,000
Ohio Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[15]			0	[15]			0	[15]
Risk Management Assets
Risk Management Assets	40,809,000				40,809,000				34,425,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	40,809,000				40,809,000				34,425,000
Liabilities:
Risk Management Liabilities	21,840,000				21,840,000				31,759,000
Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	39,000	[15]			39,000	[15]			22,000	[15]
Risk Management Assets
Risk Management Assets	(425,996,000)				(425,996,000)				(355,589,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(425,957,000)				(425,957,000)				(355,567,000)
Liabilities:
Risk Management Liabilities	(452,308,000)				(452,308,000)				(391,038,000)
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	126,539,000	[14],[9]			126,539,000	[14],[9]			105,247,000	[14],[9]
Liabilities:
Risk Management Liabilities	63,394,000	[14],[9]			63,394,000	[14],[9]			51,212,000	[14],[9]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	8,207,000	[14],[9]			8,207,000	[14],[9]			6,339,000	[14],[9]
Liabilities:
Risk Management Liabilities	4,106,000	[14],[9]			4,106,000	[14],[9]			3,433,000	[14],[9]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	504,483,000	[14],[9]			504,483,000	[14],[9]			421,249,000	[14],[9]
Liabilities:
Risk Management Liabilities	489,384,000	[14],[9]			489,384,000	[14],[9]			406,259,000	[14],[9]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	40,766,000	[14],[9]			40,766,000	[14],[9]			34,425,000	[14],[9]
Liabilities:
Risk Management Liabilities	21,840,000	[14],[9]			21,840,000	[14],[9]			31,659,000	[14],[9]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(426,917,000)	[14],[9]			(426,917,000)	[14],[9]			(356,766,000)	[14],[9]
Liabilities:
Risk Management Liabilities	(451,936,000)	[14],[9]			(451,936,000)	[14],[9]			(390,139,000)	[14],[9]
Ohio Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	36,203,000				36,203,000
Liabilities:
Risk Management Liabilities	18,995,000				18,995,000
Forward Price Range
Low	10.76				10.76
High	161.12				161.12
Ohio Power Co [Member] | Financial Trasnsmission Rights [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	4,606,000				4,606,000
Liabilities:
Risk Management Liabilities	2,845,000				2,845,000
Forward Price Range
Low	(4.02)				(4.02)
High	10.78				10.78
Ohio Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	1,420,000	[9]			1,420,000	[9]			584,000	[9]
Liabilities:
Risk Management Liabilities	5,500,000	[9]			5,500,000	[9]			3,239,000	[9]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[9]			0	[9]			0	[9]
Liabilities:
Risk Management Liabilities	0	[9]			0	[9]			0	[9]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,749,000	[9]			1,749,000	[9]			1,483,000	[9]
Liabilities:
Risk Management Liabilities	5,872,000	[9]			5,872,000	[9]			4,038,000	[9]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	43,000	[9]			43,000	[9]			0	[9]
Liabilities:
Risk Management Liabilities	0	[9]			0	[9]			100,000	[9]
Ohio Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(372,000)	[9]			(372,000)	[9]			(899,000)	[9]
Liabilities:
Risk Management Liabilities	(372,000)	[9]			(372,000)	[9]			(899,000)	[9]
Public Service Co Of Oklahoma [Member]
Risk Management Assets
Risk Management Assets	723,000				723,000				879,000
Liabilities:
Risk Management Liabilities	7,141,000				7,141,000				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	[12],[3]	0	[12],[3]	0	[12],[3]	0	[12],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[12]	0	[12]	0	[12]	0	[12]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0		0		0
Purchases, Issuances and Settlements	0	[4]	0	[4]	0	[4]	0	[4]
Transfers into Level 3	0	[5],[6]	0	[5],[6]	0	[5],[6]	0	[5],[6]
Transfers out of Level 3	0	[6],[7]	0	[6],[7]	0	[6],[7]	0	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	0	[13]	0	[13]	0	[13]	(1,000)	[13]
Ending Balance	0		0		0		0
Public Service Co Of Oklahoma [Member] | Level 1 [Member]
Liabilities:
Risk Management Liabilities	40,000				40,000				53,000
Public Service Co Of Oklahoma [Member] | Level 2 [Member]
Liabilities:
Risk Management Liabilities	11,803,000				11,803,000				9,649,000
Public Service Co Of Oklahoma [Member] | Level 3 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Public Service Co Of Oklahoma [Member] | Fair Value Inputs Other [Member]
Liabilities:
Risk Management Liabilities	(4,702,000)				(4,702,000)				(7,092,000)
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	723,000	[14],[9]			723,000	[14],[9]			879,000	[14],[9]
Liabilities:
Risk Management Liabilities	7,000,000	[14],[9]			7,000,000	[14],[9]			2,503,000	[14],[9]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	74,000	[14],[9]			74,000	[14],[9]			97,000	[14],[9]
Liabilities:
Risk Management Liabilities	40,000	[14],[9]			40,000	[14],[9]			53,000	[14],[9]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	5,245,000	[14],[9]			5,245,000	[14],[9]			7,797,000	[14],[9]
Liabilities:
Risk Management Liabilities	11,662,000	[14],[9]			11,662,000	[14],[9]			9,542,000	[14],[9]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[14],[9]			0	[14],[9]			0	[14],[9]
Liabilities:
Risk Management Liabilities	0	[14],[9]			0	[14],[9]			0	[14],[9]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(4,596,000)	[14],[9]			(4,596,000)	[14],[9]			(7,015,000)	[14],[9]
Liabilities:
Risk Management Liabilities	(4,702,000)	[14],[9]			(4,702,000)	[14],[9]			(7,092,000)	[14],[9]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member]
Liabilities:
Risk Management Liabilities	141,000				141,000				107,000
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 1 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 2 [Member]
Liabilities:
Risk Management Liabilities	141,000				141,000				107,000
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 3 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Southwestern Electric Power Co [Member]
Assets:
Cash and Cash Equivalents	14,617,000	[15]			14,617,000	[15]
Risk Management Assets
Risk Management Assets	1,665,000				1,665,000				727,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	16,282,000				16,282,000
Liabilities:
Risk Management Liabilities	8,344,000				8,344,000				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	[12],[3]	0	[12],[3]	0	[12],[3]	0	[12],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[12]	0	[12]	0	[12]	0	[12]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0		0		0
Purchases, Issuances and Settlements	0	[4]	0	[4]	0	[4]	0	[4]
Transfers into Level 3	0	[5],[6]	0	[5],[6]	0	[5],[6]	0	[5],[6]
Transfers out of Level 3	0	[6],[7]	0	[6],[7]	0	[6],[7]	0	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	0	[13]	0	[13]	0	[13]	(2,000)	[13]
Ending Balance	0		0		0		0
Southwestern Electric Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	13,515,000	[15]			13,515,000	[15]
Risk Management Assets
Risk Management Assets									122,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	13,608,000				13,608,000
Liabilities:
Risk Management Liabilities	50,000				50,000				66,000
Southwestern Electric Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	[15]			0	[15]
Risk Management Assets
Risk Management Assets									7,026,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	14,480,000				14,480,000
Liabilities:
Risk Management Liabilities	21,298,000				21,298,000				30,993,000
Southwestern Electric Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[15]			0	[15]
Risk Management Assets
Risk Management Assets									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	1,102,000	[15]			1,102,000	[15]
Risk Management Assets
Risk Management Assets									(6,421,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(11,806,000)				(11,806,000)
Liabilities:
Risk Management Liabilities	(13,004,000)				(13,004,000)				(6,479,000)
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	1,665,000	[14],[9]			1,665,000	[14],[9]			724,000	[14],[9]
Liabilities:
Risk Management Liabilities	8,208,000	[14],[9]			8,208,000	[14],[9]			5,340,000	[14],[9]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	93,000	[14],[9]			93,000	[14],[9]			122,000	[14],[9]
Liabilities:
Risk Management Liabilities	50,000	[14],[9]			50,000	[14],[9]			66,000	[14],[9]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	14,480,000	[14],[9]			14,480,000	[14],[9]			7,023,000	[14],[9]
Liabilities:
Risk Management Liabilities	21,162,000	[14],[9]			21,162,000	[14],[9]			11,753,000	[14],[9]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[14],[9]			0	[14],[9]			0	[14],[9]
Liabilities:
Risk Management Liabilities	0	[14],[9]			0	[14],[9]			0	[14],[9]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(12,908,000)	[14],[9]			(12,908,000)	[14],[9]			(6,421,000)	[14],[9]
Liabilities:
Risk Management Liabilities	(13,004,000)	[14],[9]			(13,004,000)	[14],[9]			(6,479,000)	[14],[9]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member]
Liabilities:
Risk Management Liabilities	136,000				136,000				97,000
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Liabilities:
Risk Management Liabilities	136,000				136,000				97,000
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Liabilities:
Risk Management Liabilities	0				0				0
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities:
Risk Management Liabilities	0				0				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	217,000,000	[1]			217,000,000	[1]			216,000,000	[1]
Cash [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	186,000,000	[1]			186,000,000	[1]			191,000,000	[1]
Cash [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	0	[1]			0	[1]			0	[1]
Cash [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0	[1]			0	[1]			0	[1]
Cash [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	31,000,000	[1]			31,000,000	[1]			25,000,000	[1]
Fixed Income Funds [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	944,000,000				944,000,000				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	944,000,000				944,000,000				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	944,269,000				944,269,000				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	944,269,000				944,269,000				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
Domestic [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	698,000,000	[16]			698,000,000	[16]			646,000,000	[16]
Domestic [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	698,000,000	[16]			698,000,000	[16]			646,000,000	[16]
Domestic [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]			0	[16]
Domestic [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]			0	[16]
Domestic [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]			0	[16]
Domestic [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	697,407,000	[16]			697,407,000	[16]			646,032,000	[16]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	697,407,000	[16]			697,407,000	[16]			646,032,000	[16]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]			0	[16]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]			0	[16]
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	[16]			0	[16]			0	[16]
Mutual Funds Equity [Member]
Assets:
Other Temporary Investments	15,000,000	[16]			15,000,000	[16]			14,000,000	[16]
Mutual Funds Equity [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	15,000,000	[16]			15,000,000	[16]			14,000,000	[16]
Mutual Funds Equity [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	0	[16]			0	[16]			0	[16]
Mutual Funds Equity [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0	[16]			0	[16]			0	[16]
Mutual Funds Equity [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	0	[16]			0	[16]			0	[16]
Cash and Cash Equivalents [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	16,000,000	[17]			16,000,000	[17]			18,000,000	[17]
Cash and Cash Equivalents [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Cash and Cash Equivalents [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	4,000,000	[17]			4,000,000	[17]			5,000,000	[17]
Cash and Cash Equivalents [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Cash and Cash Equivalents [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	12,000,000	[17]			12,000,000	[17]			13,000,000	[17]
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	15,826,000	[17]			15,826,000	[17]			18,229,000	[17]
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	3,984,000	[17]			3,984,000	[17]			5,431,000	[17]
Cash and Cash Equivalents [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]
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	11,842,000	[17]			11,842,000	[17]			12,798,000	[17]
US Government Agencies Debt Securities [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	644,000,000				644,000,000				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	644,000,000				644,000,000				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	643,542,000				643,542,000				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	643,542,000				643,542,000				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	44,000,000				44,000,000				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	44,000,000				44,000,000				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	44,354,000				44,354,000				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	44,354,000				44,354,000				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	256,000,000				256,000,000				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	256,000,000				256,000,000				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	256,373,000				256,373,000				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	256,373,000				256,373,000				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	21,000,000	[18]			21,000,000	[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	21,000,000	[18]			21,000,000	[18]			28,000,000	[18]
Dedesignated Risk Management Contracts [Member] | Appalachian Power Co [Member]
Risk Management Assets
Risk Management Assets	877,000	[18]			877,000	[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	877,000	[18]			877,000	[18]			1,533,000	[18]
Dedesignated Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Risk Management Assets
Risk Management Assets	617,000	[18]			617,000	[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	617,000	[18]			617,000	[18]			983,000	[18]
Dedesignated Risk Management Contracts [Member] | Ohio Power Co [Member]
Risk Management Assets
Risk Management Assets	1,293,000	[18]			1,293,000	[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	$ 1,293,000	[18]			$ 1,293,000	[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] Included in revenues on our condensed statements of income.

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

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

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

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

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

[8] 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

[9] 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.''

[10] The June 30, 2012 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $2 million in 2012, $12 million in periods 2013-2015 and ($8) million in periods 2016-2018; Level 2 matures $12 million in 2012, $52 million in periods 2013-2015, $17 million in periods 2016-2017 and $9 million in periods 2018-2030; Level 3 matures $7 million in 2012, $38 million in periods 2013-2015, $24 million in periods 2016-2017 and $27 million in periods 2018-2030. Risk management commodity contracts are substantially comprised of power contracts.

[11] 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.

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

[13] 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.

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

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

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

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