Fair Value Assets and Liabilities (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Assets:
Cash and Cash Equivalents	$ 147,000,000	[1]			$ 147,000,000	[1]			$ 279,000,000	[1]
Other Temporary Investments	288,000,000				288,000,000				324,000,000
Risk Management Assets
Risk Management Assets	485,000,000				485,000,000				559,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,839,000,000				1,839,000,000				1,706,000,000
Total Assets	2,759,000,000				2,759,000,000				2,868,000,000
Liabilities:
Risk Management Liabilities	284,000,000				284,000,000				369,000,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	122,000,000		97,000,000		86,000,000		69,000,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(2,000,000)	[2],[3]	(5,000,000)	[2],[3]	(9,000,000)	[2],[3]	(16,000,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	13,000,000	[2]	7,000,000	[2]	32,000,000	[2]	20,000,000	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(3,000,000)		5,000,000		(3,000,000)		2,000,000
Purchases, Issuances and Settlements	(8,000,000)	[4]	4,000,000	[4]	(7,000,000)	[4]	33,000,000	[4]
Transfers into Level 3	0	[5],[6]	(3,000,000)	[5],[6]	18,000,000	[5],[6]	10,000,000	[5],[6]
Transfers out of Level 3	(2,000,000)	[6],[7]	(1,000,000)	[6],[7]	(1,000,000)	[6],[7]	(21,000,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	0	[8]	0	[8]	4,000,000	[8]	7,000,000	[8]
Ending Balance	120,000,000		104,000,000		120,000,000		104,000,000
Level 3 Quantitative Information [Abstract]
Counterparty Credit Risk					374	[9]
Level 1 [Member]
Assets:
Cash and Cash Equivalents	14,000,000	[1]			14,000,000	[1]			6,000,000	[1]
Other Temporary Investments	273,000,000				273,000,000				310,000,000
Risk Management Assets
Risk Management Assets	36,000,000				36,000,000				55,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	927,000,000				927,000,000				743,000,000
Total Assets	1,250,000,000				1,250,000,000				1,114,000,000
Liabilities:
Risk Management Liabilities	40,000,000				40,000,000				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	7,000,000				7,000,000				5,000,000
Risk Management Assets
Risk Management Assets	704,000,000				704,000,000				968,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	903,000,000				903,000,000				953,000,000
Total Assets	1,615,000,000				1,615,000,000				1,927,000,000
Liabilities:
Risk Management Liabilities	647,000,000				647,000,000				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	147,000,000				147,000,000				131,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	147,000,000				147,000,000				131,000,000
Liabilities:
Risk Management Liabilities	27,000,000				27,000,000				45,000,000
Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	132,000,000	[1]			132,000,000	[1]			272,000,000	[1]
Other Temporary Investments	8,000,000				8,000,000				9,000,000
Risk Management Assets
Risk Management Assets	(402,000,000)				(402,000,000)				(595,000,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	9,000,000				9,000,000				10,000,000
Total Assets	(253,000,000)				(253,000,000)				(304,000,000)
Liabilities:
Risk Management Liabilities	(430,000,000)				(430,000,000)				(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	1,000,000				1,000,000				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	4,000,000				4,000,000				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	6,000,000				6,000,000				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	48,000,000				48,000,000				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	60,000,000				60,000,000				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	32,000,000				32,000,000				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	7,000,000				7,000,000				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	25,000,000				25,000,000				24,000,000
Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	462,000,000	[10],[11]			462,000,000	[10],[11]			517,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	259,000,000	[10],[11]			259,000,000	[10],[11]			292,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	34,000,000	[10],[11]			34,000,000	[10],[11]			47,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	40,000,000	[10],[11]			40,000,000	[10],[11]			45,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	680,000,000	[10],[11]			680,000,000	[10],[11]			938,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	613,000,000	[10],[11]			613,000,000	[10],[11]			838,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	147,000,000	[10],[11]			147,000,000	[10],[11]			131,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	24,000,000	[10],[11]			24,000,000	[10],[11]			45,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(399,000,000)	[10],[11]			(399,000,000)	[10],[11]			(599,000,000)	[10],[12]
Liabilities:
Risk Management Liabilities	(418,000,000)	[10],[11]			(418,000,000)	[10],[11]			(636,000,000)	[10],[12]
Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	139,000,000				139,000,000
Liabilities:
Risk Management Liabilities	23,000,000				23,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	10.86	[13]			10.86	[13]
Forward Price Range High	126.65	[13]			126.65	[13]
FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	8,000,000				8,000,000
Liabilities:
Risk Management Liabilities	4,000,000				4,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(11.44)	[13]			(11.44)	[13]
Forward Price Range High	13.11	[13]			13.11	[13]
Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	9,000,000	[10]			9,000,000	[10]			24,000,000	[10]
Liabilities:
Risk Management Liabilities	11,000,000	[10]			11,000,000	[10]			36,000,000	[10]
Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	2,000,000	[10]			2,000,000	[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	22,000,000	[10]			22,000,000	[10]			28,000,000	[10]
Liabilities:
Risk Management Liabilities	23,000,000	[10]			23,000,000	[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	3,000,000	[10]			3,000,000	[10]			0	[10]
Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(15,000,000)	[10]			(15,000,000)	[10]			(12,000,000)	[10]
Liabilities:
Risk Management Liabilities	(15,000,000)	[10]			(15,000,000)	[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	5,000,000				5,000,000				4,000,000
Liabilities:
Risk Management Liabilities	12,000,000				12,000,000				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	2,000,000				2,000,000				2,000,000
Liabilities:
Risk Management Liabilities	9,000,000				9,000,000				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	45,389,000				45,389,000				65,320,000
Liabilities:
Risk Management Liabilities	23,722,000				23,722,000				35,174,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	12,976,000		12,864,000		10,979,000		1,971,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(1,200,000)	[2],[3]	(3,540,000)	[2],[3]	(3,450,000)	[2],[3]	(5,108,000)	[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		403,000		0		312,000
Purchases, Issuances and Settlements	(1,058,000)	[4]	929,000	[4]	1,712,000	[4]	10,605,000	[4]
Transfers into Level 3	13,000	[5],[6]	654,000	[5],[6]	961,000	[5],[6]	4,142,000	[5],[6]
Transfers out of Level 3	(15,000)	[6],[7]	(287,000)	[6],[7]	(925,000)	[6],[7]	(4,910,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	195,000	[8]	17,000	[8]	1,634,000	[8]	4,028,000	[8]
Ending Balance	10,911,000		11,040,000		10,911,000		11,040,000
Appalachian Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	1,799,000				1,799,000				4,161,000
Liabilities:
Risk Management Liabilities	1,274,000				1,274,000				1,959,000
Appalachian Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	85,894,000				85,894,000				167,414,000
Liabilities:
Risk Management Liabilities	81,155,000				81,155,000				160,216,000
Appalachian Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	13,701,000				13,701,000				17,058,000
Liabilities:
Risk Management Liabilities	2,790,000				2,790,000				6,079,000
Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(56,005,000)				(56,005,000)				(123,313,000)
Liabilities:
Risk Management Liabilities	(61,497,000)				(61,497,000)				(133,080,000)
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	45,082,000	[10],[14]			45,082,000	[10],[14]			65,018,000	[10],[14]
Liabilities:
Risk Management Liabilities	23,292,000	[10],[14]			23,292,000	[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	1,799,000	[10],[14]			1,799,000	[10],[14]			4,161,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,274,000	[10],[14]			1,274,000	[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	85,442,000	[10],[14]			85,442,000	[10],[14]			166,916,000	[10],[14]
Liabilities:
Risk Management Liabilities	80,580,000	[10],[14]			80,580,000	[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	13,701,000	[10],[14]			13,701,000	[10],[14]			17,058,000	[10],[14]
Liabilities:
Risk Management Liabilities	2,790,000	[10],[14]			2,790,000	[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	(55,860,000)	[10],[14]			(55,860,000)	[10],[14]			(123,117,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(61,352,000)	[10],[14]			(61,352,000)	[10],[14]			(132,884,000)	[10],[14]
Appalachian Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	11,506,000				11,506,000
Liabilities:
Risk Management Liabilities	1,940,000				1,940,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	12.52				12.52
Forward Price Range High	55.40				55.40
Appalachian Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	2,195,000				2,195,000
Liabilities:
Risk Management Liabilities	850,000				850,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.26)				(5.26)
Forward Price Range High	10.85				10.85
Appalachian Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	307,000	[10]			307,000	[10]			302,000	[10]
Liabilities:
Risk Management Liabilities	430,000	[10]			430,000	[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	452,000	[10]			452,000	[10]			498,000	[10]
Liabilities:
Risk Management Liabilities	575,000	[10]			575,000	[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	(145,000)	[10]			(145,000)	[10]			(196,000)	[10]
Liabilities:
Risk Management Liabilities	(145,000)	[10]			(145,000)	[10]			(196,000)	[10]
Indiana Michigan Power Co [Member]
Risk Management Assets
Risk Management Assets	29,883,000				29,883,000				50,543,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,839,118,000				1,839,118,000				1,705,772,000
Total Assets	1,869,001,000				1,869,001,000				1,756,315,000
Liabilities:
Risk Management Liabilities	17,575,000				17,575,000				45,415,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	8,967,000		9,049,000		7,541,000		1,263,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(754,000)	[2],[3]	(2,440,000)	[2],[3]	(2,386,000)	[2],[3]	(3,488,000)	[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		277,000		0		211,000
Purchases, Issuances and Settlements	(757,000)	[4]	635,000	[4]	1,213,000	[4]	7,325,000	[4]
Transfers into Level 3	9,000	[5],[6]	460,000	[5],[6]	661,000	[5],[6]	2,749,000	[5],[6]
Transfers out of Level 3	(11,000)	[6],[7]	(202,000)	[6],[7]	(637,000)	[6],[7]	(3,193,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	(275,000)	[8]	(193,000)	[8]	787,000	[8]	2,719,000	[8]
Ending Balance	7,179,000		7,586,000		7,179,000		7,586,000
Indiana Michigan Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	1,184,000				1,184,000				2,858,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	926,976,000				926,976,000				742,090,000
Total Assets	928,160,000				928,160,000				744,948,000
Liabilities:
Risk Management Liabilities	838,000				838,000				1,346,000
Indiana Michigan Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	56,449,000				56,449,000				120,572,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	903,388,000				903,388,000				953,407,000
Total Assets	959,837,000				959,837,000				1,073,979,000
Liabilities:
Risk Management Liabilities	55,278,000				55,278,000				131,206,000
Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	9,015,000				9,015,000				11,717,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	9,015,000				9,015,000				11,717,000
Liabilities:
Risk Management Liabilities	1,836,000				1,836,000				4,176,000
Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(36,765,000)				(36,765,000)				(84,604,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,754,000				8,754,000				10,275,000
Total Assets	(28,011,000)				(28,011,000)				(74,329,000)
Liabilities:
Risk Management Liabilities	(40,377,000)				(40,377,000)				(91,313,000)
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	29,684,000	[10],[14]			29,684,000	[10],[14]			50,343,000	[10],[14]
Liabilities:
Risk Management Liabilities	17,297,000	[10],[14]			17,297,000	[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	1,184,000	[10],[14]			1,184,000	[10],[14]			2,858,000	[10],[14]
Liabilities:
Risk Management Liabilities	838,000	[10],[14]			838,000	[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	56,155,000	[10],[14]			56,155,000	[10],[14]			120,242,000	[10],[14]
Liabilities:
Risk Management Liabilities	54,905,000	[10],[14]			54,905,000	[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	9,015,000	[10],[14]			9,015,000	[10],[14]			11,717,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,836,000	[10],[14]			1,836,000	[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	(36,670,000)	[10],[14]			(36,670,000)	[10],[14]			(84,474,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(40,282,000)	[10],[14]			(40,282,000)	[10],[14]			(91,183,000)	[10],[14]
Indiana Michigan Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	7,571,000				7,571,000
Liabilities:
Risk Management Liabilities	1,276,000				1,276,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	12.52				12.52
Forward Price Range High	55.40				55.40
Indiana Michigan Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	1,444,000				1,444,000
Liabilities:
Risk Management Liabilities	560,000				560,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.26)				(5.26)
Forward Price Range High	10.85				10.85
Indiana Michigan Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	199,000	[10]			199,000	[10]			200,000	[10]
Liabilities:
Risk Management Liabilities	278,000	[10]			278,000	[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	294,000	[10]			294,000	[10]			330,000	[10]
Liabilities:
Risk Management Liabilities	373,000	[10]			373,000	[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	(95,000)	[10]			(95,000)	[10]			(130,000)	[10]
Liabilities:
Risk Management Liabilities	(95,000)	[10]			(95,000)	[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	8,065,000	[15]			8,065,000	[15]			65,000	[15]
Risk Management Assets
Risk Management Assets	62,772,000				62,772,000				92,601,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	70,837,000				70,837,000				92,666,000
Liabilities:
Risk Management Liabilities	33,008,000				33,008,000				50,120,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	18,347,000		18,969,000		15,429,000		2,666,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(1,616,000)	[2],[3]	(5,024,000)	[2],[3]	(4,879,000)	[2],[3]	(7,316,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	(89,000)	[2]	(1,030,000)	[2]	351,000	[2]	4,973,000	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		571,000		0		435,000
Purchases, Issuances and Settlements	(1,504,000)	[4]	1,299,000	[4]	2,463,000	[4]	15,375,000	[4]
Transfers into Level 3	18,000	[5],[6]	964,000	[5],[6]	1,353,000	[5],[6]	5,789,000	[5],[6]
Transfers out of Level 3	(21,000)	[6],[7]	(423,000)	[6],[7]	(1,303,000)	[6],[7]	(6,733,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	(164,000)	[8]	253,000	[8]	1,557,000	[8]	390,000	[8]
Ending Balance	14,971,000		15,579,000		14,971,000		15,579,000
Ohio Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	8,022,000	[15]			8,022,000	[15]			0	[15]
Risk Management Assets
Risk Management Assets	2,469,000				2,469,000				5,848,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	10,491,000				10,491,000				5,848,000
Liabilities:
Risk Management Liabilities	1,748,000				1,748,000				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	120,365,000				120,365,000				238,942,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	120,391,000				120,391,000				238,968,000
Liabilities:
Risk Management Liabilities	113,827,000				113,827,000				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	18,799,000				18,799,000				23,973,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	18,799,000				18,799,000				23,973,000
Liabilities:
Risk Management Liabilities	3,828,000				3,828,000				8,544,000
Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	17,000	[15]			17,000	[15]			39,000	[15]
Risk Management Assets
Risk Management Assets	(78,861,000)				(78,861,000)				(176,162,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(78,844,000)				(78,844,000)				(176,123,000)
Liabilities:
Risk Management Liabilities	(86,395,000)				(86,395,000)				(189,888,000)
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	62,354,000	[10],[14]			62,354,000	[10],[14]			92,185,000	[10],[14]
Liabilities:
Risk Management Liabilities	32,423,000	[10],[14]			32,423,000	[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	2,469,000	[10],[14]			2,469,000	[10],[14]			5,848,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,748,000	[10],[14]			1,748,000	[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	119,749,000	[10],[14]			119,749,000	[10],[14]			238,254,000	[10],[14]
Liabilities:
Risk Management Liabilities	113,044,000	[10],[14]			113,044,000	[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	18,799,000	[10],[14]			18,799,000	[10],[14]			23,973,000	[10],[14]
Liabilities:
Risk Management Liabilities	3,828,000	[10],[14]			3,828,000	[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	(78,663,000)	[10],[14]			(78,663,000)	[10],[14]			(175,890,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(86,197,000)	[10],[14]			(86,197,000)	[10],[14]			(189,616,000)	[10],[14]
Ohio Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	15,787,000				15,787,000
Liabilities:
Risk Management Liabilities	2,661,000				2,661,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	12.52				12.52
Forward Price Range High	55.40				55.40
Ohio Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	3,012,000				3,012,000
Liabilities:
Risk Management Liabilities	1,167,000				1,167,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.26)				(5.26)
Forward Price Range High	10.85				10.85
Ohio Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	418,000	[10]			418,000	[10]			416,000	[10]
Liabilities:
Risk Management Liabilities	585,000	[10]			585,000	[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	616,000	[10]			616,000	[10]			688,000	[10]
Liabilities:
Risk Management Liabilities	783,000	[10]			783,000	[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	(198,000)	[10]			(198,000)	[10]			(272,000)	[10]
Liabilities:
Risk Management Liabilities	(198,000)	[10]			(198,000)	[10]			(272,000)	[10]
Public Service Co Of Oklahoma [Member]
Risk Management Assets
Risk Management Assets	1,001,000				1,001,000				540,000
Liabilities:
Risk Management Liabilities	1,388,000				1,388,000				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	1,553,000				1,553,000				1,699,000
Liabilities:
Risk Management Liabilities	1,947,000				1,947,000				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	(552,000)				(552,000)				(1,159,000)
Liabilities:
Risk Management Liabilities	(559,000)				(559,000)				(1,159,000)
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	991,000	[10],[14]			991,000	[10],[14]			515,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,372,000	[10],[14]			1,372,000	[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	1,543,000	[10],[14]			1,543,000	[10],[14]			1,657,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,931,000	[10],[14]			1,931,000	[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	(552,000)	[10],[14]			(552,000)	[10],[14]			(1,142,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(559,000)	[10],[14]			(559,000)	[10],[14]			(1,142,000)	[10],[14]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	10,000	[10]			10,000	[10]			25,000	[10]
Liabilities:
Risk Management Liabilities	16,000	[10]			16,000	[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	10,000	[10]			10,000	[10]			42,000	[10]
Liabilities:
Risk Management Liabilities	16,000	[10]			16,000	[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	0	[10]			0	[10]			(17,000)	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			(17,000)	[10]
Southwestern Electric Power Co [Member]
Assets:
Cash and Cash Equivalents	17,651,000	[15]			17,651,000	[15]
Risk Management Assets
Risk Management Assets	423,000				423,000				695,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	18,074,000				18,074,000
Liabilities:
Risk Management Liabilities	296,000				296,000				1,128,000
Southwestern Electric Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	14,186,000	[15]			14,186,000	[15]
Risk Management Assets
Risk Management Assets	0				0				0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	14,186,000				14,186,000
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	1,476,000				1,476,000				2,845,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	1,476,000				1,476,000
Liabilities:
Risk Management Liabilities	1,357,000				1,357,000				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	3,465,000	[15]			3,465,000	[15]
Risk Management Assets
Risk Management Assets	(1,053,000)				(1,053,000)				(2,150,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	2,412,000				2,412,000
Liabilities:
Risk Management Liabilities	(1,061,000)				(1,061,000)				(2,150,000)
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	411,000	[10],[14]			411,000	[10],[14]			671,000	[10],[14]
Liabilities:
Risk Management Liabilities	277,000	[10],[14]			277,000	[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	1,464,000	[10],[14]			1,464,000	[10],[14]			2,804,000	[10],[14]
Liabilities:
Risk Management Liabilities	1,338,000	[10],[14]			1,338,000	[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	(1,053,000)	[10],[14]			(1,053,000)	[10],[14]			(2,133,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(1,061,000)	[10],[14]			(1,061,000)	[10],[14]			(2,133,000)	[10],[14]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	12,000	[10]			12,000	[10]			24,000	[10]
Liabilities:
Risk Management Liabilities	19,000	[10]			19,000	[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	12,000	[10]			12,000	[10]			41,000	[10]
Liabilities:
Risk Management Liabilities	19,000	[10]			19,000	[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	0	[10]			0	[10]			(17,000)	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]			(17,000)	[10]
Cash [Member]
Assets:
Other Temporary Investments	188,000,000	[1]			188,000,000	[1]			241,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	15,000,000	[16]			15,000,000	[16]			17,000,000	[16]
Cash [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	173,000,000	[1]			173,000,000	[1]			227,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	6,000,000	[16]			6,000,000	[16]			7,000,000	[16]
Cash [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	7,000,000	[1]			7,000,000	[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	8,000,000	[1]			8,000,000	[1]			9,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	9,000,000	[16]			9,000,000	[16]			10,000,000	[16]
Cash [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	14,438,000	[17]			14,438,000	[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	5,684,000	[17]			5,684,000	[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	8,754,000	[17]			8,754,000	[17]			10,275,000	[17]
Fixed Income Funds [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	903,000,000				903,000,000				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	903,000,000				903,000,000				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	903,388,000				903,388,000				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	903,388,000				903,388,000				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	79,000,000				79,000,000				67,000,000
Mutual Funds Fixed Income [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	79,000,000				79,000,000				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	921,000,000	[18]			921,000,000	[18]			736,000,000	[18]
Domestic [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	921,000,000	[18]			921,000,000	[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	921,292,000	[18]			921,292,000	[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	921,292,000	[18]			921,292,000	[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	21,000,000	[18]			21,000,000	[18]			16,000,000	[18]
Mutual Funds Equity [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	21,000,000	[18]			21,000,000	[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	15,000,000				15,000,000				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	14,438,000				14,438,000				16,783,000
US Government Agencies Debt Securities [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	621,000,000				621,000,000				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	621,000,000				621,000,000				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	620,944,000				620,944,000				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	620,944,000				620,944,000				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	38,000,000				38,000,000				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	38,000,000				38,000,000				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	38,272,000				38,272,000				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	38,272,000				38,272,000				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	244,000,000				244,000,000				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	244,000,000				244,000,000				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	244,172,000				244,172,000				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	244,172,000				244,172,000				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 September 30, 2013 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $1 million in 2013, ($3) million in periods 2014-2016 and ($4) million in periods 2017-2018; Level 2 matures $4 million in 2013, $48 million in periods 2014-2016, $8 million in periods 2017-2018 and $7 million in periods 2019-2030; Level 3 matures $6 million in 2013, $60 million in periods 2014-2016, $32 million in periods 2017-2018 and $25 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.