Fair Value Assets and Liabilities (Details) (USD $)	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	$ 194,000,000	[1]			$ 194,000,000	[1]			$ 118,000,000	[1]
Other Temporary Investments	318,000,000				318,000,000				353,000,000
Risk Management Assets
Risk Management Assets	363,000,000				363,000,000				457,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,020,000,000				2,020,000,000				1,932,000,000
Total Assets	2,895,000,000				2,895,000,000				2,860,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	180,000,000				180,000,000				267,000,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	132,000,000		122,000,000		117,000,000		86,000,000		86,000,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(9,000,000)	[2],[3]	(2,000,000)	[2],[3]	91,000,000	[2],[3]	(9,000,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	10,000,000	[3]	13,000,000	[3]	(3,000,000)	[3]	32,000,000	[3]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(3,000,000)		(3,000,000)		12,000,000		(3,000,000)
Purchases, Issuances and Settlements	(5,000,000)	[4]	(8,000,000)	[4]	(103,000,000)	[4]	(7,000,000)	[4]
Transfers into Level 3	(9,000,000)	[5],[6]			(9,000,000)	[5],[6]	18,000,000	[5],[6]
Transfers out of Level 3	(1,000,000)	[6],[7]	(2,000,000)	[6],[7]	(8,000,000)	[6],[7]	(1,000,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	14,000,000	[8]			32,000,000	[8]	4,000,000	[8]
Ending Balance	129,000,000		120,000,000		129,000,000		120,000,000		117,000,000
Level 3 Quantitative Information [Abstract]
Counterparty Credit Risk					3.01%	[9]			3.16%	[9]
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	22,000,000	[1]			22,000,000	[1]			16,000,000	[1]
Other Temporary Investments	301,000,000				301,000,000				334,000,000
Risk Management Assets
Risk Management Assets	13,000,000				13,000,000				22,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,070,000,000				1,070,000,000				1,020,000,000
Total Assets	1,406,000,000				1,406,000,000				1,392,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	26,000,000				26,000,000				30,000,000
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	1,000,000	[1]			1,000,000	[1]			1,000,000	[1]
Other Temporary Investments	8,000,000				8,000,000				8,000,000
Risk Management Assets
Risk Management Assets	458,000,000				458,000,000				565,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	941,000,000				941,000,000				901,000,000
Total Assets	1,408,000,000				1,408,000,000				1,475,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	379,000,000				379,000,000				499,000,000
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[1]			0	[1]			0	[1]
Other Temporary Investments	0				0				0
Risk Management Assets
Risk Management Assets	159,000,000				159,000,000				142,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	159,000,000				159,000,000				142,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	30,000,000				30,000,000				25,000,000
Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	171,000,000	[1]			171,000,000	[1]			101,000,000	[1]
Other Temporary Investments	9,000,000				9,000,000				11,000,000
Risk Management Assets
Risk Management Assets	(267,000,000)				(267,000,000)				(272,000,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	9,000,000				9,000,000				11,000,000
Total Assets	(78,000,000)				(78,000,000)				(149,000,000)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(255,000,000)				(255,000,000)				(287,000,000)
2014 [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
2014 [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				25,000,000
2014 [Member] | Level 3 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	38,000,000				38,000,000				27,000,000
2015 - 2017 [Member] | Level 1 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	(12,000,000)				(12,000,000)				(11,000,000)
2015 - 2017 [Member] | Level 2 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	67,000,000				67,000,000				37,000,000
2015 - 2017 [Member] | Level 3 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	46,000,000				46,000,000				60,000,000
2018 - 2019 [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)				(1,000,000)
2018 - 2019 [Member] | Level 2 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	9,000,000				9,000,000				7,000,000
2018 - 2019 [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	16,000,000				16,000,000				14,000,000
2020 - 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	4,000,000				4,000,000				5,000,000
2020 - 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				19,000,000
Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	348,000,000	[10],[11]			348,000,000	[10],[11]			440,000,000	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	164,000,000	[10],[11]			164,000,000	[10],[11]			245,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	13,000,000	[10],[11]			13,000,000	[10],[11]			22,000,000	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	26,000,000	[10],[11]			26,000,000	[10],[11]			30,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	441,000,000	[10],[11]			441,000,000	[10],[11]			549,000,000	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	355,000,000	[10],[11]			355,000,000	[10],[11]			475,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	155,000,000	[10],[11]			155,000,000	[10],[11]			142,000,000	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	30,000,000	[10],[11]			30,000,000	[10],[11]			22,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(261,000,000)	[10],[11]			(261,000,000)	[10],[11]			(273,000,000)	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(247,000,000)	[10],[11]			(247,000,000)	[10],[11]			(282,000,000)	[10],[12]
Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	124,000,000				124,000,000				132,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	29,000,000				29,000,000				22,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	9.93	[13]			9.93	[13]			11.42	[13]
Forward Price Range High	103.05	[13]			103.05	[13]			120.72	[13]
Weighted Average Market Price	47.87	[13]			47.87	[13]
FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	35,000,000				35,000,000				10,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,000,000				1,000,000				3,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(14.63)	[13]			(14.63)	[13]			(5.10)	[13]
Forward Price Range High	15.47	[13]			15.47	[13]			10.44	[13]
Weighted Average Market Price	1.31	[13]			1.31	[13]
Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	9,000,000	[10]			9,000,000	[10]			7,000,000	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	3,000,000	[10]			3,000,000	[10]			6,000,000	[10]
Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]			0	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[10]			0	[10]			0	[10]
Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	16,000,000	[10]			16,000,000	[10]			15,000,000	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	14,000,000	[10]			14,000,000	[10]			11,000,000	[10]
Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	4,000,000	[10]			4,000,000	[10]			0	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[10]			0	[10]			3,000,000	[10]
Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(11,000,000)	[10]			(11,000,000)	[10]			(8,000,000)	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(11,000,000)	[10]			(11,000,000)	[10]			(8,000,000)	[10]
Interest Rate Foreign Currency Hedges [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,000,000				1,000,000				2,000,000
Interest Rate Foreign Currency Hedges [Member] | Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0				0				0
Interest Rate Foreign Currency Hedges [Member] | Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,000,000				1,000,000				2,000,000
Interest Rate Foreign Currency Hedges [Member] | Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0				0				0
Interest Rate Foreign Currency Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities, Fair Value Disclosure [Abstract]
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, Fair Value Disclosure [Abstract]
Risk Management Liabilities	12,000,000				12,000,000				14,000,000
Fair Value Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0				0				0
Liabilities, Fair Value Disclosure [Abstract]
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				1,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	9,000,000				9,000,000				11,000,000
Fair Value Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0				0				0
Liabilities, Fair Value Disclosure [Abstract]
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				3,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	3,000,000				3,000,000				3,000,000
Appalachian Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	8,116,000	[14]			8,116,000	[14]			2,750,000	[14]
Risk Management Assets
Risk Management Assets									38,119,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	36,436,000				36,436,000				40,869,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									19,133,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	18,394,000		12,976,000		10,562,000		10,979,000		10,979,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(5,629,000)	[2],[3]	(1,200,000)	[2],[3]	29,467,000	[2],[3]	(3,450,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date			0	[3]			0	[3]
Purchases, Issuances and Settlements	(1,560,000)	[4]	(1,058,000)	[4]	(32,213,000)	[4]	1,712,000	[4]
Transfers into Level 3	(6,000)	[5],[6]	13,000	[5],[6]	(3,648,000)	[5],[6]	961,000	[5],[6]
Transfers out of Level 3	(30,000)	[6],[7]	(15,000)	[6],[7]	(32,000)	[6],[7]	(925,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	4,843,000	[8]	195,000	[8]	11,876,000	[8]	1,634,000	[8]
Ending Balance	16,012,000		10,911,000		16,012,000		10,911,000
Appalachian Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	8,071,000	[14]			8,071,000	[14]			2,714,000	[14]
Risk Management Assets
Risk Management Assets									827,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	8,262,000				8,262,000				3,541,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									700,000
Appalachian Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]			0	[14]
Risk Management Assets
Risk Management Assets									54,837,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	20,498,000				20,498,000				54,837,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									49,533,000
Appalachian Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]			0	[14]
Risk Management Assets
Risk Management Assets	17,784,000				17,784,000				12,097,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	17,784,000				17,784,000				12,097,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,772,000				1,772,000				1,535,000
Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	45,000	[14]			45,000	[14]			36,000	[14]
Risk Management Assets
Risk Management Assets									(29,642,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(10,108,000)				(10,108,000)				(29,606,000)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									(32,635,000)
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	28,320,000	[15],[16]			28,320,000	[15],[16]			37,756,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	9,664,000	[15],[16]			9,664,000	[15],[16]			18,846,000	[15],[16]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	191,000	[15],[16]			191,000	[15],[16]			827,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	186,000	[15],[16]			186,000	[15],[16]			700,000	[15],[16]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	20,498,000	[15],[16]			20,498,000	[15],[16]			54,448,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	17,679,000	[15],[16]			17,679,000	[15],[16]			49,220,000	[15],[16]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	17,784,000	[15],[16]			17,784,000	[15],[16]			12,097,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,772,000	[15],[16]			1,772,000	[15],[16]			1,535,000	[15],[16]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(10,153,000)	[15],[16]			(10,153,000)	[15],[16]			(29,616,000)	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(9,973,000)	[15],[16]			(9,973,000)	[15],[16]			(32,609,000)	[15],[16]
Appalachian Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	4,873,000				4,873,000				9,359,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,615,000				1,615,000				960,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	12.55	[13]			12.55	[13]			13.04	[13]
Forward Price Range High	80.7	[13]			80.7	[13]			80.5	[13]
Weighted Average Market Price	41.68	[13]			41.68	[13]
Appalachian Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	12,911,000				12,911,000				2,738,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	157,000				157,000				575,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(14.63)	[13]			(14.63)	[13]			(5.10)	[13]
Forward Price Range High	15.47	[13]			15.47	[13]			10.44	[13]
Weighted Average Market Price	1.38	[13]			1.38	[13]
Appalachian Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets									363,000	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									287,000	[16]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									0	[16]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets									389,000	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									313,000	[16]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									0	[16]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets									(26,000)	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									(26,000)	[16]
Indiana Michigan Power Co [Member]
Risk Management Assets
Risk Management Assets									26,883,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,020,248,000				2,020,248,000				1,931,610,000
Total Assets	2,040,987,000				2,040,987,000				1,958,493,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									13,975,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	12,923,000		8,967,000		7,164,000		7,541,000		7,541,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(3,832,000)	[2],[3]	(754,000)	[2],[3]	18,438,000	[2],[3]	(2,386,000)	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date			0	[3]			0	[3]
Purchases, Issuances and Settlements	(1,244,000)	[4]	(757,000)	[4]	(20,301,000)	[4]	1,213,000	[4]
Transfers into Level 3	(4,000)	[5],[6]	9,000	[5],[6]	(2,475,000)	[5],[6]	661,000	[5],[6]
Transfers out of Level 3	(20,000)	[6],[7]	(11,000)	[6],[7]	(22,000)	[6],[7]	(637,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	4,319,000	[8]	(275,000)	[8]	9,338,000	[8]	787,000	[8]
Ending Balance	12,142,000		7,179,000		12,142,000		7,179,000
Indiana Michigan Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets									561,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,070,184,000				1,070,184,000				1,020,593,000
Total Assets	1,070,313,000				1,070,313,000				1,021,154,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									475,000
Indiana Michigan Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets									38,901,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	941,346,000				941,346,000				900,295,000
Total Assets	955,862,000				955,862,000				939,196,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									35,273,000
Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	13,344,000				13,344,000				8,205,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0				0
Total Assets	13,344,000				13,344,000				8,205,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,202,000				1,202,000				1,041,000
Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets									(20,784,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,718,000				8,718,000				10,722,000
Total Assets	1,468,000				1,468,000				(10,062,000)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									(22,814,000)
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	20,739,000	[15],[16]			20,739,000	[15],[16]			26,667,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	5,657,000	[15],[16]			5,657,000	[15],[16]			13,781,000	[15],[16]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	129,000	[15],[16]			129,000	[15],[16]			561,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	125,000	[15],[16]			125,000	[15],[16]			475,000	[15],[16]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	14,516,000	[15],[16]			14,516,000	[15],[16]			38,667,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	11,577,000	[15],[16]			11,577,000	[15],[16]			35,061,000	[15],[16]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	13,344,000	[15],[16]			13,344,000	[15],[16]			8,205,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,202,000	[15],[16]			1,202,000	[15],[16]			1,041,000	[15],[16]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(7,250,000)	[15],[16]			(7,250,000)	[15],[16]			(20,766,000)	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(7,247,000)	[15],[16]			(7,247,000)	[15],[16]			(22,796,000)	[15],[16]
Indiana Michigan Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	3,496,000				3,496,000				6,348,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,095,000				1,095,000				651,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	12.55	[13]			12.55	[13]			13.04	[13]
Forward Price Range High	80.7	[13]			80.7	[13]			80.5	[13]
Weighted Average Market Price	41.68	[13]			41.68	[13]
Indiana Michigan Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	9,848,000				9,848,000				1,857,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	107,000				107,000				390,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(14.63)	[13]			(14.63)	[13]			(5.10)	[13]
Forward Price Range High	15.47	[13]			15.47	[13]			10.44	[13]
Weighted Average Market Price	1.38	[13]			1.38	[13]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets									216,000	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									194,000	[16]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									0	[16]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets									234,000	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									212,000	[16]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									0	[16]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets									(18,000)	[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities									(18,000)	[16]
Ohio Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	17,756,000	[14]			17,756,000	[14]			19,399,000	[14]
Risk Management Assets
Risk Management Assets									3,082,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	25,678,000				25,678,000				22,481,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	9,300,000		18,347,000		2,920,000		15,429,000		15,429,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(3,639,000)	[2],[3]	(1,616,000)	[2],[3]	30,768,000	[2],[3]	(4,879,000)	[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)	[3]			351,000	[3]
Purchases, Issuances and Settlements	(637,000)	[4]	(1,504,000)	[4]	(33,688,000)	[4]	2,463,000	[4]
Transfers into Level 3	0	[5],[6]	18,000	[5],[6]	0	[5],[6]	1,353,000	[5],[6]
Transfers out of Level 3	0	[6],[7]	(21,000)	[6],[7]	0	[6],[7]	(1,303,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	2,865,000	[8]	(164,000)	[8]	7,889,000	[8]	1,557,000	[8]
Ending Balance	7,889,000		14,971,000		7,889,000		14,971,000
Ohio Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	17,734,000	[14]			17,734,000	[14]			19,387,000	[14]
Risk Management Assets
Risk Management Assets									0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	17,734,000				17,734,000				19,387,000
Ohio Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]			0	[14]
Risk Management Assets
Risk Management Assets									162,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	0				0				162,000
Ohio Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]			0	[14]
Risk Management Assets
Risk Management Assets									3,269,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	7,889,000				7,889,000				3,269,000
Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	22,000	[14]			22,000	[14]			12,000	[14]
Risk Management Assets
Risk Management Assets									(349,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	55,000				55,000				(337,000)
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	7,922,000	[15],[16]			7,922,000	[15],[16]			2,920,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[15],[16]			0	[15],[16]			0	[15],[16]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[15],[16]			0	[15],[16]			0	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[15],[16]			0	[15],[16]			0	[15],[16]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0	[15],[16]			0	[15],[16]			0	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	215,000	[15],[16]			215,000	[15],[16]			0	[15],[16]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	7,889,000	[15],[16]			7,889,000	[15],[16]			3,269,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[15],[16]			0	[15],[16]			349,000	[15],[16]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	33,000	[15],[16]			33,000	[15],[16]			(349,000)	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(215,000)	[15],[16]			(215,000)	[15],[16]			(349,000)	[15],[16]
Ohio Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	7,889,000				7,889,000				3,269,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0				0				349,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(14.63)	[13]			(14.63)	[13]			(5.1)	[13]
Forward Price Range High	15.47	[13]			15.47	[13]			10.44	[13]
Weighted Average Market Price	1.38	[13]			1.38	[13]
Ohio Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets									162,000	[16]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets									162,000	[16]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Ohio Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Public Service Co Of Oklahoma [Member]
Risk Management Assets
Risk Management Assets									1,167,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	(3,000)		0		0		0		0
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	2,000	[2],[3]	0	[2],[3]	0	[2],[3]	0	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date			0	[3]			0	[3]
Purchases, Issuances and Settlements	0	[4]	0	[4]	0	[4]	0	[4]
Transfers into Level 3	0	[5],[6]	0	[5],[6]	0	[5],[6]	0	[5],[6]
Transfers out of Level 3	0	[6],[7]	0	[6],[7]	0	[6],[7]	0	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	335,000	[8]	0	[8]	334,000	[8]	0	[8]
Ending Balance	334,000		0		334,000		0
Public Service Co Of Oklahoma [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets									0
Public Service Co Of Oklahoma [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets									1,162,000
Public Service Co Of Oklahoma [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets									0
Public Service Co Of Oklahoma [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets									5,000
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	566,000	[15],[16]			566,000	[15],[16]			1,083,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[15],[16]			0	[15],[16]			85,000	[15],[16]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[15],[16]			0	[15],[16]			0	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[15],[16]			0	[15],[16]			0	[15],[16]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	232,000	[15],[16]			232,000	[15],[16]			1,078,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	141,000	[15],[16]			141,000	[15],[16]			81,000	[15],[16]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	383,000	[15],[16]			383,000	[15],[16]			0	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	49,000	[15],[16]			49,000	[15],[16]			0	[15],[16]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(49,000)	[15],[16]			(49,000)	[15],[16]			5,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(190,000)	[15],[16]			(190,000)	[15],[16]			4,000	[15],[16]
Public Service Co Of Oklahoma [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	383,000				383,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	49,000				49,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(14.63)	[13]			(14.63)	[13]
Forward Price Range High	15.47	[13]			15.47	[13]
Weighted Average Market Price	1.38	[13]			1.38	[13]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets									84,000	[16]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets									84,000	[16]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Southwestern Electric Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	23,986,000	[14]			23,986,000	[14]			17,241,000	[14]
Risk Management Assets
Risk Management Assets									1,179,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	24,397,000				24,397,000				18,420,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	(3,000)		0		0		0		0
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	2,000	[2],[3]	0	[2],[3]	0	[2],[3]	0	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date			0	[3]			0	[3]
Purchases, Issuances and Settlements	0	[4]	0	[4]	0	[4]	0	[4]
Transfers into Level 3	0	[5],[6]	0	[5],[6]	0	[5],[6]	0	[5],[6]
Transfers out of Level 3	0	[6],[7]	0	[6],[7]	0	[6],[7]	0	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	409,000	[8]	0	[8]	408,000	[8]	0	[8]
Ending Balance	408,000		0		408,000		0
Southwestern Electric Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	21,611,000	[14]			21,611,000	[14]			15,871,000	[14]
Risk Management Assets
Risk Management Assets									0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	21,611,000				21,611,000				15,871,000
Southwestern Electric Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]			0	[14]
Risk Management Assets
Risk Management Assets									1,330,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	3,000				3,000				1,330,000
Southwestern Electric Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]			0	[14]
Risk Management Assets
Risk Management Assets									0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	468,000				468,000				0
Southwestern Electric Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	2,375,000	[14]			2,375,000	[14]			1,370,000	[14]
Risk Management Assets
Risk Management Assets									(151,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	2,315,000				2,315,000				1,219,000
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	411,000	[15],[16]			411,000	[15],[16]			1,082,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	131,000	[15],[16]			131,000	[15],[16]			0	[15],[16]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[15],[16]			0	[15],[16]			0	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[15],[16]			0	[15],[16]			0	[15],[16]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	3,000	[15],[16]			3,000	[15],[16]			1,233,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	291,000	[15],[16]			291,000	[15],[16]			154,000	[15],[16]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	468,000	[15],[16]			468,000	[15],[16]			0	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	60,000	[15],[16]			60,000	[15],[16]			0	[15],[16]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(60,000)	[15],[16]			(60,000)	[15],[16]			(151,000)	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(220,000)	[15],[16]			(220,000)	[15],[16]			(154,000)	[15],[16]
Southwestern Electric Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	468,000				468,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	60,000				60,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(14.63)	[13]			(14.63)	[13]
Forward Price Range High	15.47	[13]			15.47	[13]
Weighted Average Market Price	1.38	[13]			1.38	[13]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets									97,000	[16]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets									97,000	[16]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets									0	[16]
Cash [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	213,000,000	[1]			213,000,000	[1]			250,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13,000,000	[17]			13,000,000	[17]			19,000,000	[17]
Cash [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	196,000,000	[1]			196,000,000	[1]			231,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	4,000,000	[17]			4,000,000	[17]			8,000,000	[17]
Cash [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	8,000,000	[1]			8,000,000	[1]			8,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Cash [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0	[1]			0	[1]			0	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]			0	[17]
Cash [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	9,000,000	[1]			9,000,000	[1]			11,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	9,000,000	[17]			9,000,000	[17]			11,000,000	[17]
Cash [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13,188,000	[18]			13,188,000	[18]			18,804,000	[18]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	4,470,000	[18]			4,470,000	[18]			8,082,000	[18]
Cash [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]
Cash [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]
Cash [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,718,000	[18]			8,718,000	[18]			10,722,000	[18]
Fixed Income Funds [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	941,000,000				941,000,000				901,000,000
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	941,000,000				941,000,000				901,000,000
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	941,346,000				941,346,000				900,295,000
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	941,346,000				941,346,000				900,295,000
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, Fair Value Disclosure [Abstract]
Other Temporary Investments	80,000,000				80,000,000				80,000,000
Mutual Funds Fixed Income [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	80,000,000				80,000,000				80,000,000
Mutual Funds Fixed Income [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0				0				0
Mutual Funds Fixed Income [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0				0				0
Mutual Funds Fixed Income [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0				0				0
Domestic [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,066,000,000	[19]			1,066,000,000	[19]			1,012,000,000	[19]
Domestic [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,066,000,000	[19]			1,066,000,000	[19]			1,012,000,000	[19]
Domestic [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[19]			0	[19]			0	[19]
Domestic [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[19]			0	[19]			0	[19]
Domestic [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[19]			0	[19]			0	[19]
Domestic [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,065,714,000	[19]			1,065,714,000	[19]			1,012,511,000	[19]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,065,714,000	[19]			1,065,714,000	[19]			1,012,511,000	[19]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[19]			0	[19]			0	[19]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[19]			0	[19]			0	[19]
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	[19]			0	[19]			0	[19]
Mutual Funds Equity [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	25,000,000	[19]			25,000,000	[19]			23,000,000	[19]
Mutual Funds Equity [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	25,000,000	[19]			25,000,000	[19]			23,000,000	[19]
Mutual Funds Equity [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0	[19]			0	[19]			0	[19]
Mutual Funds Equity [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0	[19]			0	[19]			0	[19]
Mutual Funds Equity [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0	[19]			0	[19]			0	[19]
Cash and Cash Equivalents [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13,000,000				13,000,000				19,000,000
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13,188,000				13,188,000				18,804,000
US Government Agencies Debt Securities [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	609,000,000				609,000,000				609,000,000
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	609,000,000				609,000,000				609,000,000
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	609,441,000				609,441,000				608,875,000
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	609,441,000				609,441,000				608,875,000
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	46,000,000				46,000,000				37,000,000
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	46,000,000				46,000,000				37,000,000
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	46,409,000				46,409,000				36,782,000
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	46,409,000				46,409,000				36,782,000
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	286,000,000				286,000,000				255,000,000
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	286,000,000				286,000,000				255,000,000
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	285,496,000				285,496,000				254,638,000
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	285,496,000				285,496,000				254,638,000
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	2,000,000	[20]			2,000,000	[20]			6,000,000	[20]
Dedesignated Risk Management Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[20]			0	[20]			0	[20]
Dedesignated Risk Management Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0	[20]			0	[20]			0	[20]
Dedesignated Risk Management Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[20]			0	[20]			0	[20]
Dedesignated Risk Management Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	$ 2,000,000	[20]			$ 2,000,000	[20]			$ 6,000,000	[20]

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

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

[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, 2014 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures ($12) million in periods 2015-2017 and ($1) million in periods 2018-2019; Level 2 matures $6 million in 2014, $67 million in periods 2015-2017, $9 million in periods 2018-2019 and $4 million in periods 2020-2030; Level 3 matures $38 million in 2014, $46 million in periods 2015-2017, $16 million in periods 2018-2019 and $25 million in periods 2020-2030. Risk management commodity contracts are substantially comprised of power contracts.

[12] The December 31, 2013 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $4 million in 2014, ($11) million in periods 2015-2017 and ($1) million in periods 2018-2019; Level 2 matures $25 million in 2014, $37 million in periods 2015-2017, $7 million in periods 2018-2019 and $5 million in periods 2020-2030; Level 3 matures $27 million in 2014, $60 million in periods 2015-2017, $14 million in periods 2018-2019 and $19 million in periods 2020-2030. Risk management commodity contracts are substantially comprised of power contracts.

[13] Represents market prices in dollars per MWh.

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

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

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

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

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

[20] 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.