Fair Value Assets and Liabilities (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Assets:
Cash and Cash Equivalents	$ 117,000,000	[1]			$ 117,000,000	[1]			$ 279,000,000	[1]
Other Temporary Investments	298,000,000				298,000,000				324,000,000
Risk Management Assets
Risk Management Assets	504,000,000				504,000,000				559,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,791,000,000				1,791,000,000				1,706,000,000
Total Assets	2,710,000,000				2,710,000,000				2,868,000,000
Liabilities:
Risk Management Liabilities	292,000,000				292,000,000				369,000,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	76,000,000		92,000,000		86,000,000		69,000,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(1,000,000)	[2],[3]	(11,000,000)	[2],[3]	(12,000,000)	[2],[3]	(17,000,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	26,000,000	[2]	4,000,000	[2]	22,000,000	[2]	5,000,000	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(1,000,000)		0		0		0
Purchases, Issuances and Settlements	(2,000,000)	[4]	15,000,000	[4]	(1,000,000)	[4]	33,000,000	[4]
Transfers into Level 3	12,000,000	[5],[6]	(1,000,000)	[5],[6]	18,000,000	[5],[6]	14,000,000	[5],[6]
Transfers out of Level 3	1,000,000	[6],[7]	(8,000,000)	[6],[7]	1,000,000	[6],[7]	(20,000,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	11,000,000	[8]	6,000,000	[8]	8,000,000	[8]	13,000,000	[8]
Ending Balance	122,000,000		97,000,000		122,000,000		97,000,000
Level 3 Quantitative Information [Abstract]
Counterparty Credit Risk					356	[9]
Level 1 [Member]
Assets:
Cash and Cash Equivalents	10,000,000	[1]			10,000,000	[1]			6,000,000	[1]
Other Temporary Investments	280,000,000				280,000,000				310,000,000
Risk Management Assets
Risk Management Assets	42,000,000				42,000,000				55,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	878,000,000				878,000,000				743,000,000
Total Assets	1,210,000,000				1,210,000,000				1,114,000,000
Liabilities:
Risk Management Liabilities	42,000,000				42,000,000				45,000,000
Level 2 [Member]
Assets:
Cash and Cash Equivalents	1,000,000	[1]			1,000,000	[1]			1,000,000	[1]
Other Temporary Investments	6,000,000				6,000,000				5,000,000
Risk Management Assets
Risk Management Assets	805,000,000				805,000,000				968,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	902,000,000				902,000,000				953,000,000
Total Assets	1,714,000,000				1,714,000,000				1,927,000,000
Liabilities:
Risk Management Liabilities	742,000,000				742,000,000				925,000,000
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	142,000,000				142,000,000				131,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	142,000,000				142,000,000				131,000,000
Liabilities:
Risk Management Liabilities	20,000,000				20,000,000				45,000,000
Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	106,000,000	[1]			106,000,000	[1]			272,000,000	[1]
Other Temporary Investments	12,000,000				12,000,000				9,000,000
Risk Management Assets
Risk Management Assets	(485,000,000)				(485,000,000)				(595,000,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	11,000,000				11,000,000				10,000,000
Total Assets	(356,000,000)				(356,000,000)				(304,000,000)
Liabilities:
Risk Management Liabilities	(512,000,000)				(512,000,000)				(646,000,000)
2013 [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				3,000,000				9,000,000
2013 [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				16,000,000
2013 [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	19,000,000				19,000,000				18,000,000
2014 - 2016 [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)				(3,000,000)				(3,000,000)
2014 - 2016 [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	53,000,000				53,000,000				61,000,000
2014 - 2016 [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	50,000,000				50,000,000				31,000,000
2017 - 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	(4,000,000)				(4,000,000)				(4,000,000)
2017 - 2018 [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	8,000,000				8,000,000				16,000,000
2017 - 2018 [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	30,000,000				30,000,000				13,000,000
2019 - 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	6,000,000				6,000,000				7,000,000
2019 - 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	23,000,000				23,000,000				24,000,000
Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	477,000,000	[10],[11]			477,000,000	[10],[11]			517,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	262,000,000	[10],[11]			262,000,000	[10],[11]			292,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	38,000,000	[10],[11]			38,000,000	[10],[11]			47,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	42,000,000	[10],[11]			42,000,000	[10],[11]			45,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	776,000,000	[10],[11]			776,000,000	[10],[11]			938,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	697,000,000	[10],[11]			697,000,000	[10],[11]			838,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	142,000,000	[10],[11]			142,000,000	[10],[11]			131,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	20,000,000	[10],[11]			20,000,000	[10],[11]			45,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(479,000,000)	[10],[11]			(479,000,000)	[10],[11]			(599,000,000)	[10],[12]
Liabilities:
Risk Management Liabilities	(497,000,000)	[10],[11]			(497,000,000)	[10],[11]			(636,000,000)	[10],[12]
Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	128,000,000				128,000,000
Liabilities:
Risk Management Liabilities	16,000,000				16,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	10.17	[13]			10.17	[13]
Forward Price Range High	140.98	[13]			140.98	[13]
FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	14,000,000				14,000,000
Liabilities:
Risk Management Liabilities	4,000,000				4,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(26.98)	[13]			(26.98)	[13]
Forward Price Range High	11.19	[13]			11.19	[13]
Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	14,000,000	[10]			14,000,000	[10]			24,000,000	[10]
Liabilities:
Risk Management Liabilities	12,000,000	[10]			12,000,000	[10]			36,000,000	[10]
Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	4,000,000	[10]			4,000,000	[10]			8,000,000	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	28,000,000	[10]			28,000,000	[10]			28,000,000	[10]
Liabilities:
Risk Management Liabilities	30,000,000	[10]			30,000,000	[10]			48,000,000	[10]
Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[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	(18,000,000)	[10]			(18,000,000)	[10]			(12,000,000)	[10]
Liabilities:
Risk Management Liabilities	(18,000,000)	[10]			(18,000,000)	[10]			(12,000,000)	[10]
Interest Rate Foreign Currency Hedges [Member]
Liabilities:
Risk Management Liabilities	2,000,000				2,000,000				37,000,000
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	2,000,000				2,000,000				37,000,000
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	4,000,000				4,000,000				4,000,000
Liabilities:
Risk Management Liabilities	16,000,000				16,000,000				4,000,000
Fair Value Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0				0				0
Liabilities:
Risk Management Liabilities	0				0				0
Fair Value Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,000,000				1,000,000				2,000,000
Liabilities:
Risk Management Liabilities	13,000,000				13,000,000				2,000,000
Fair Value Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0				0				0
Liabilities:
Risk Management Liabilities	0				0				0
Fair Value Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	3,000,000				3,000,000				2,000,000
Liabilities:
Risk Management Liabilities	3,000,000				3,000,000				2,000,000
Appalachian Power Co [Member]
Risk Management Assets
Risk Management Assets	52,128,000				52,128,000				65,320,000
Liabilities:
Risk Management Liabilities	27,404,000				27,404,000				35,174,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	8,756,000		7,981,000		10,979,000		1,971,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(369,000)	[2],[3]	(3,210,000)	[2],[3]	(3,532,000)	[2],[3]	(5,313,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[2]	0	[2]	0	[2]	0	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		(11,000)		0		52,000
Purchases, Issuances and Settlements	641,000	[4]	4,988,000	[4]	2,859,000	[4]	11,499,000	[4]
Transfers into Level 3	243,000	[5],[6]	1,301,000	[5],[6]	875,000	[5],[6]	3,562,000	[5],[6]
Transfers out of Level 3	(362,000)	[6],[7]	(557,000)	[6],[7]	(941,000)	[6],[7]	(4,676,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	4,067,000	[8]	2,372,000	[8]	2,736,000	[8]	5,769,000	[8]
Ending Balance	12,976,000		12,864,000		12,976,000		12,864,000
Appalachian Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	2,555,000				2,555,000				4,161,000
Liabilities:
Risk Management Liabilities	1,477,000				1,477,000				1,959,000
Appalachian Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	108,091,000				108,091,000				167,414,000
Liabilities:
Risk Management Liabilities	101,886,000				101,886,000				160,216,000
Appalachian Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	15,526,000				15,526,000				17,058,000
Liabilities:
Risk Management Liabilities	2,550,000				2,550,000				6,079,000
Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(74,044,000)				(74,044,000)				(123,313,000)
Liabilities:
Risk Management Liabilities	(78,509,000)				(78,509,000)				(133,080,000)
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	51,558,000	[10],[14]			51,558,000	[10],[14]			65,018,000	[10],[14]
Liabilities:
Risk Management Liabilities	27,126,000	[10],[14]			27,126,000	[10],[14]			33,819,000	[10],[14]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	2,555,000	[10],[14]			2,555,000	[10],[14]			4,161,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,477,000	[10],[14]			1,477,000	[10],[14]			1,959,000	[10],[14]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	107,096,000	[10],[14]			107,096,000	[10],[14]			166,916,000	[10],[14]
Liabilities:
Risk Management Liabilities	101,183,000	[10],[14]			101,183,000	[10],[14]			158,665,000	[10],[14]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	15,526,000	[10],[14]			15,526,000	[10],[14]			17,058,000	[10],[14]
Liabilities:
Risk Management Liabilities	2,550,000	[10],[14]			2,550,000	[10],[14]			6,079,000	[10],[14]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(73,619,000)	[10],[14]			(73,619,000)	[10],[14]			(123,117,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(78,084,000)	[10],[14]			(78,084,000)	[10],[14]			(132,884,000)	[10],[14]
Appalachian Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	11,823,000				11,823,000
Liabilities:
Risk Management Liabilities	1,613,000				1,613,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	11.48				11.48
Forward Price Range High	70.90				70.90
Appalachian Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	3,703,000				3,703,000
Liabilities:
Risk Management Liabilities	937,000				937,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(12.31)				(12.31)
Forward Price Range High	11.19				11.19
Appalachian Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	570,000	[10]			570,000	[10]			302,000	[10]
Liabilities:
Risk Management Liabilities	278,000	[10]			278,000	[10]			1,355,000	[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	995,000	[10]			995,000	[10]			498,000	[10]
Liabilities:
Risk Management Liabilities	703,000	[10]			703,000	[10]			1,551,000	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 3 [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] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(425,000)	[10]			(425,000)	[10]			(196,000)	[10]
Liabilities:
Risk Management Liabilities	(425,000)	[10]			(425,000)	[10]			(196,000)	[10]
Indiana Michigan Power Co [Member]
Risk Management Assets
Risk Management Assets	35,914,000				35,914,000				50,543,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,791,394,000				1,791,394,000				1,705,772,000
Total Assets	1,827,308,000				1,827,308,000				1,756,315,000
Liabilities:
Risk Management Liabilities	19,407,000				19,407,000				45,415,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	6,051,000		5,614,000		7,541,000		1,263,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(255,000)	[2],[3]	(2,258,000)	[2],[3]	(2,439,000)	[2],[3]	(3,590,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	0	[2]	0	[2]	0	[2]	0	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		(8,000)		0		34,000
Purchases, Issuances and Settlements	443,000	[4]	3,508,000	[4]	1,977,000	[4]	7,811,000	[4]
Transfers into Level 3	168,000	[5],[6]	915,000	[5],[6]	602,000	[5],[6]	2,341,000	[5],[6]
Transfers out of Level 3	(250,000)	[6],[7]	(392,000)	[6],[7]	(648,000)	[6],[7]	(3,028,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	2,810,000	[8]	1,670,000	[8]	1,934,000	[8]	4,218,000	[8]
Ending Balance	8,967,000		9,049,000		8,967,000		9,049,000
Indiana Michigan Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	1,766,000				1,766,000				2,858,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	877,628,000				877,628,000				742,090,000
Total Assets	879,394,000				879,394,000				744,948,000
Liabilities:
Risk Management Liabilities	1,021,000				1,021,000				1,346,000
Indiana Michigan Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	74,388,000				74,388,000				120,572,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	902,573,000				902,573,000				953,407,000
Total Assets	976,961,000				976,961,000				1,073,979,000
Liabilities:
Risk Management Liabilities	70,667,000				70,667,000				131,206,000
Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	10,729,000				10,729,000				11,717,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	10,729,000				10,729,000				11,717,000
Liabilities:
Risk Management Liabilities	1,762,000				1,762,000				4,176,000
Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(50,969,000)				(50,969,000)				(84,604,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	11,193,000				11,193,000				10,275,000
Total Assets	(39,776,000)				(39,776,000)				(74,329,000)
Liabilities:
Risk Management Liabilities	(54,043,000)				(54,043,000)				(91,313,000)
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	35,521,000	[10],[14]			35,521,000	[10],[14]			50,343,000	[10],[14]
Liabilities:
Risk Management Liabilities	19,233,000	[10],[14]			19,233,000	[10],[14]			24,960,000	[10],[14]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	1,766,000	[10],[14]			1,766,000	[10],[14]			2,858,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,021,000	[10],[14]			1,021,000	[10],[14]			1,346,000	[10],[14]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	73,702,000	[10],[14]			73,702,000	[10],[14]			120,242,000	[10],[14]
Liabilities:
Risk Management Liabilities	70,200,000	[10],[14]			70,200,000	[10],[14]			110,621,000	[10],[14]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	10,729,000	[10],[14]			10,729,000	[10],[14]			11,717,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,762,000	[10],[14]			1,762,000	[10],[14]			4,176,000	[10],[14]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(50,676,000)	[10],[14]			(50,676,000)	[10],[14]			(84,474,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(53,750,000)	[10],[14]			(53,750,000)	[10],[14]			(91,183,000)	[10],[14]
Indiana Michigan Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	8,170,000				8,170,000
Liabilities:
Risk Management Liabilities	1,115,000				1,115,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	11.48				11.48
Forward Price Range High	70.90				70.90
Indiana Michigan Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	2,559,000				2,559,000
Liabilities:
Risk Management Liabilities	647,000				647,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(12.31)				(12.31)
Forward Price Range High	11.19				11.19
Indiana Michigan Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	393,000	[10]			393,000	[10]			200,000	[10]
Liabilities:
Risk Management Liabilities	174,000	[10]			174,000	[10]			931,000	[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	686,000	[10]			686,000	[10]			330,000	[10]
Liabilities:
Risk Management Liabilities	467,000	[10]			467,000	[10]			1,061,000	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 3 [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] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(293,000)	[10]			(293,000)	[10]			(130,000)	[10]
Liabilities:
Risk Management Liabilities	(293,000)	[10]			(293,000)	[10]			(130,000)	[10]
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member]
Liabilities:
Risk Management Liabilities									19,524,000
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 1 [Member]
Liabilities:
Risk Management Liabilities									0
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 2 [Member]
Liabilities:
Risk Management Liabilities									19,524,000
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Level 3 [Member]
Liabilities:
Risk Management Liabilities									0
Indiana Michigan Power Co [Member] | Interest Rate Foreign Currency Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities:
Risk Management Liabilities									0
Ohio Power Co [Member]
Assets:
Cash and Cash Equivalents	65,000	[15]			65,000	[15]			65,000	[15]
Risk Management Assets
Risk Management Assets	74,526,000				74,526,000				92,601,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	74,591,000				74,591,000				92,666,000
Liabilities:
Risk Management Liabilities	39,572,000				39,572,000				50,120,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	12,381,000		11,767,000		15,429,000		2,666,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(522,000)	[2],[3]	(4,734,000)	[2],[3]	(4,990,000)	[2],[3]	(7,533,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	2,390,000	[2]	1,711,000	[2]	598,000	[2]	7,035,000	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		(16,000)		0		71,000
Purchases, Issuances and Settlements	906,000	[4]	7,355,000	[4]	4,045,000	[4]	16,397,000	[4]
Transfers into Level 3	344,000	[5],[6]	1,919,000	[5],[6]	1,231,000	[5],[6]	4,934,000	[5],[6]
Transfers out of Level 3	(512,000)	[6],[7]	(821,000)	[6],[7]	(1,326,000)	[6],[7]	(6,388,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	3,360,000	[8]	1,788,000	[8]	3,360,000	[8]	1,787,000	[8]
Ending Balance	18,347,000		18,969,000		18,347,000		18,969,000
Ohio Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	0	[15]			0	[15]			0	[15]
Risk Management Assets
Risk Management Assets	3,613,000				3,613,000				5,848,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	3,613,000				3,613,000				5,848,000
Liabilities:
Risk Management Liabilities	2,088,000				2,088,000				2,753,000
Ohio Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	26,000	[15]			26,000	[15]			26,000	[15]
Risk Management Assets
Risk Management Assets	156,955,000				156,955,000				238,942,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	156,981,000				156,981,000				238,968,000
Liabilities:
Risk Management Liabilities	148,170,000				148,170,000				228,711,000
Ohio Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[15]			0	[15]			0	[15]
Risk Management Assets
Risk Management Assets	21,953,000				21,953,000				23,973,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	21,953,000				21,953,000				23,973,000
Liabilities:
Risk Management Liabilities	3,606,000				3,606,000				8,544,000
Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	39,000	[15]			39,000	[15]			39,000	[15]
Risk Management Assets
Risk Management Assets	(107,995,000)				(107,995,000)				(176,162,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(107,956,000)				(107,956,000)				(176,123,000)
Liabilities:
Risk Management Liabilities	(114,292,000)				(114,292,000)				(189,888,000)
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	73,721,000	[10],[14]			73,721,000	[10],[14]			92,185,000	[10],[14]
Liabilities:
Risk Management Liabilities	39,201,000	[10],[14]			39,201,000	[10],[14]			48,217,000	[10],[14]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	3,613,000	[10],[14]			3,613,000	[10],[14]			5,848,000	[10],[14]
Liabilities:
Risk Management Liabilities	2,088,000	[10],[14]			2,088,000	[10],[14]			2,753,000	[10],[14]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	155,550,000	[10],[14]			155,550,000	[10],[14]			238,254,000	[10],[14]
Liabilities:
Risk Management Liabilities	147,199,000	[10],[14]			147,199,000	[10],[14]			226,536,000	[10],[14]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	21,953,000	[10],[14]			21,953,000	[10],[14]			23,973,000	[10],[14]
Liabilities:
Risk Management Liabilities	3,606,000	[10],[14]			3,606,000	[10],[14]			8,544,000	[10],[14]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(107,395,000)	[10],[14]			(107,395,000)	[10],[14]			(175,890,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(113,692,000)	[10],[14]			(113,692,000)	[10],[14]			(189,616,000)	[10],[14]
Ohio Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	16,717,000				16,717,000
Liabilities:
Risk Management Liabilities	2,282,000				2,282,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	11.48				11.48
Forward Price Range High	70.90				70.90
Ohio Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	5,236,000				5,236,000
Liabilities:
Risk Management Liabilities	1,324,000				1,324,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(12.31)				(12.31)
Forward Price Range High	11.19				11.19
Ohio Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	805,000	[10]			805,000	[10]			416,000	[10]
Liabilities:
Risk Management Liabilities	371,000	[10]			371,000	[10]			1,903,000	[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	1,405,000	[10]			1,405,000	[10]			688,000	[10]
Liabilities:
Risk Management Liabilities	971,000	[10]			971,000	[10]			2,175,000	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 3 [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] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(600,000)	[10]			(600,000)	[10]			(272,000)	[10]
Liabilities:
Risk Management Liabilities	(600,000)	[10]			(600,000)	[10]			(272,000)	[10]
Public Service Co Of Oklahoma [Member]
Risk Management Assets
Risk Management Assets	484,000				484,000				540,000
Liabilities:
Risk Management Liabilities	2,113,000				2,113,000				5,879,000
Public Service Co Of Oklahoma [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0				0				0
Liabilities:
Risk Management Liabilities	0				0				0
Public Service Co Of Oklahoma [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,295,000				1,295,000				1,699,000
Liabilities:
Risk Management Liabilities	2,959,000				2,959,000				7,038,000
Public Service Co Of Oklahoma [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0				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	(811,000)				(811,000)				(1,159,000)
Liabilities:
Risk Management Liabilities	(846,000)				(846,000)				(1,159,000)
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	482,000	[10],[14]			482,000	[10],[14]			515,000	[10],[14]
Liabilities:
Risk Management Liabilities	2,068,000	[10],[14]			2,068,000	[10],[14]			5,879,000	[10],[14]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10],[14]			0	[10],[14]			0	[10],[14]
Liabilities:
Risk Management Liabilities	0	[10],[14]			0	[10],[14]			0	[10],[14]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,289,000	[10],[14]			1,289,000	[10],[14]			1,657,000	[10],[14]
Liabilities:
Risk Management Liabilities	2,910,000	[10],[14]			2,910,000	[10],[14]			7,021,000	[10],[14]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10],[14]			0	[10],[14]			0	[10],[14]
Liabilities:
Risk Management Liabilities	0	[10],[14]			0	[10],[14]			0	[10],[14]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(807,000)	[10],[14]			(807,000)	[10],[14]			(1,142,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(842,000)	[10],[14]			(842,000)	[10],[14]			(1,142,000)	[10],[14]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	2,000	[10]			2,000	[10]			25,000	[10]
Liabilities:
Risk Management Liabilities	45,000	[10]			45,000	[10]			0	[10]
Public Service Co Of Oklahoma [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]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	6,000	[10]			6,000	[10]			42,000	[10]
Liabilities:
Risk Management Liabilities	49,000	[10]			49,000	[10]			17,000	[10]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(4,000)	[10]			(4,000)	[10]			(17,000)	[10]
Liabilities:
Risk Management Liabilities	(4,000)	[10]			(4,000)	[10]			(17,000)	[10]
Southwestern Electric Power Co [Member]
Assets:
Cash and Cash Equivalents	11,840,000	[15]			11,840,000	[15]
Risk Management Assets
Risk Management Assets	398,000				398,000				695,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	12,238,000				12,238,000
Liabilities:
Risk Management Liabilities	944,000				944,000				1,128,000
Southwestern Electric Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	10,078,000	[15]			10,078,000	[15]
Risk Management Assets
Risk Management Assets	0				0				0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	10,078,000				10,078,000
Liabilities:
Risk Management Liabilities	0				0				0
Southwestern Electric Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	[15]			0	[15]
Risk Management Assets
Risk Management Assets	1,853,000				1,853,000				2,845,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	1,853,000				1,853,000
Liabilities:
Risk Management Liabilities	2,443,000				2,443,000				3,278,000
Southwestern Electric Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[15]			0	[15]
Risk Management Assets
Risk Management Assets	0				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	1,762,000	[15]			1,762,000	[15]
Risk Management Assets
Risk Management Assets	(1,455,000)				(1,455,000)				(2,150,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	307,000				307,000
Liabilities:
Risk Management Liabilities	(1,499,000)				(1,499,000)				(2,150,000)
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	396,000	[10],[14]			396,000	[10],[14]			671,000	[10],[14]
Liabilities:
Risk Management Liabilities	888,000	[10],[14]			888,000	[10],[14]			1,128,000	[10],[14]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10],[14]			0	[10],[14]			0	[10],[14]
Liabilities:
Risk Management Liabilities	0	[10],[14]			0	[10],[14]			0	[10],[14]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	1,846,000	[10],[14]			1,846,000	[10],[14]			2,804,000	[10],[14]
Liabilities:
Risk Management Liabilities	2,382,000	[10],[14]			2,382,000	[10],[14]			3,261,000	[10],[14]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10],[14]			0	[10],[14]			0	[10],[14]
Liabilities:
Risk Management Liabilities	0	[10],[14]			0	[10],[14]			0	[10],[14]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(1,450,000)	[10],[14]			(1,450,000)	[10],[14]			(2,133,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(1,494,000)	[10],[14]			(1,494,000)	[10],[14]			(2,133,000)	[10],[14]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	2,000	[10]			2,000	[10]			24,000	[10]
Liabilities:
Risk Management Liabilities	56,000	[10]			56,000	[10]			0	[10]
Southwestern Electric 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]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	7,000	[10]			7,000	[10]			41,000	[10]
Liabilities:
Risk Management Liabilities	61,000	[10]			61,000	[10]			17,000	[10]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(5,000)	[10]			(5,000)	[10]			(17,000)	[10]
Liabilities:
Risk Management Liabilities	(5,000)	[10]			(5,000)	[10]			(17,000)	[10]
Cash [Member]
Assets:
Other Temporary Investments	204,000,000	[1]			204,000,000	[1]			241,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	14,000,000	[16]			14,000,000	[16]			17,000,000	[16]
Cash [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	186,000,000	[1]			186,000,000	[1]			227,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	3,000,000	[16]			3,000,000	[16]			7,000,000	[16]
Cash [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	6,000,000	[1]			6,000,000	[1]			5,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]			0	[16]
Cash [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0	[1]			0	[1]			0	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]			0	[16]
Cash [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	12,000,000	[1]			12,000,000	[1]			9,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	11,000,000	[16]			11,000,000	[16]			10,000,000	[16]
Cash [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	14,132,000	[17]			14,132,000	[17]			16,783,000	[17]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,939,000	[17]			2,939,000	[17]			6,508,000	[17]
Cash [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]
Cash [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 [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	11,193,000	[17]			11,193,000	[17]			10,275,000	[17]
Fixed Income Funds [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	902,000,000				902,000,000				953,000,000
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	902,000,000				902,000,000				953,000,000
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	902,573,000				902,573,000				953,407,000
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	902,573,000				902,573,000				953,407,000
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	76,000,000				76,000,000				67,000,000
Mutual Funds Fixed Income [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	76,000,000				76,000,000				67,000,000
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	875,000,000	[18]			875,000,000	[18]			736,000,000	[18]
Domestic [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	875,000,000	[18]			875,000,000	[18]			736,000,000	[18]
Domestic [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[18]			0	[18]			0	[18]
Domestic [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[18]			0	[18]			0	[18]
Domestic [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[18]			0	[18]			0	[18]
Domestic [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	874,689,000	[18]			874,689,000	[18]			735,582,000	[18]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	874,689,000	[18]			874,689,000	[18]			735,582,000	[18]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[18]			0	[18]			0	[18]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[18]			0	[18]			0	[18]
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	[18]			0	[18]			0	[18]
Mutual Funds Equity [Member]
Assets:
Other Temporary Investments	18,000,000	[18]			18,000,000	[18]			16,000,000	[18]
Mutual Funds Equity [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	18,000,000	[18]			18,000,000	[18]			16,000,000	[18]
Mutual Funds Equity [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	0	[18]			0	[18]			0	[18]
Mutual Funds Equity [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0	[18]			0	[18]			0	[18]
Mutual Funds Equity [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	0	[18]			0	[18]			0	[18]
Cash and Cash Equivalents [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	14,000,000				14,000,000				17,000,000
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	14,132,000				14,132,000				16,783,000
US Government Agencies Debt Securities [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	605,000,000				605,000,000				648,000,000
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	605,000,000				605,000,000				648,000,000
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	604,850,000				604,850,000				647,918,000
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	604,850,000				604,850,000				647,918,000
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	35,000,000				35,000,000				35,000,000
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	35,000,000				35,000,000				35,000,000
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	35,202,000				35,202,000				35,399,000
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	35,202,000				35,202,000				35,399,000
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	262,000,000				262,000,000				270,000,000
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	262,000,000				262,000,000				270,000,000
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	262,521,000				262,521,000				270,090,000
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	262,521,000				262,521,000				270,090,000
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	9,000,000	[19]			9,000,000	[19]			14,000,000	[19]
Dedesignated Risk Management Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[19]			0	[19]			0	[19]
Dedesignated Risk Management Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0	[19]			0	[19]			0	[19]
Dedesignated Risk Management Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[19]			0	[19]			0	[19]
Dedesignated Risk Management Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	$ 9,000,000	[19]			$ 9,000,000	[19]			$ 14,000,000	[19]

[1] Amounts in ''Other'' column primarily represent cash deposits in bank accounts with financial institutions or with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.

[2] Included in revenues on the 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 the condensed statements of income. These net gains (losses) are recorded as regulatory liabilities/assets

[9] Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.

[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 June 30, 2013 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 2013, ($3) million in periods 2014-2016 and ($4) million in periods 2017-2018; Level 2 matures $12 million in 2013, $53 million in periods 2014-2016, $8 million in periods 2017-2018 and $6 million in periods 2019-2030; Level 3 matures $19 million in 2013, $50 million in periods 2014-2016, $30 million in periods 2017-2018 and $23 million in periods 2019-2030. Risk management commodity contracts are substantially comprised of power contracts.

[12] The December 31, 2012 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $9 million in 2013, ($3) million in periods 2014-2016 and ($4) million in periods 2017-2018; Level 2 matures $16 million in 2013, $61 million in periods 2014-2016, $16 million in periods 2017-2018 and $7 million in periods 2019-2030; Level 3 matures $18 million in 2013, $31 million in periods 2014-2016, $13 million in periods 2017-2018 and $24 million in periods 2019-2030. Risk management commodity contracts are substantially comprised of power contracts.

[13] Represents market prices in dollars per MWh

[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 in ''Other'' column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds.

[17] Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds.

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

[19] 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.