Fair Value Assets and Liabilities (Details) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Assets:
Cash and Cash Equivalents	$ 292,000,000	[1]			$ 118,000,000	[1]
Other Temporary Investments	310,000,000				353,000,000
Risk Management Assets
Risk Management Assets	391,000,000				457,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,962,000,000				1,932,000,000
Total Assets	2,955,000,000				2,860,000,000
Liabilities:
Risk Management Liabilities	197,000,000				267,000,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	117,000,000		86,000,000		86,000,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	84,000,000	[2],[3]	(4,000,000)	[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)	[2]	(5,000,000)	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	9,000,000		1,000,000
Purchases, Issuances and Settlements	(100,000,000)	[4]	(6,000,000)	[4]
Transfers into Level 3	(4,000,000)	[5],[6]	6,000,000	[5],[6]
Transfers out of Level 3	(2,000,000)	[6],[7]	0	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	11,000,000	[8]	(2,000,000)	[8]
Ending Balance	105,000,000		76,000,000		117,000,000
Level 3 Quantitative Information [Abstract]
Significant Unobservable Input Counterparty Credit Risk	3.15%	[9]			3.16%	[9]
Level 1 [Member]
Assets:
Cash and Cash Equivalents	16,000,000	[1]			16,000,000	[1]
Other Temporary Investments	291,000,000				334,000,000
Risk Management Assets
Risk Management Assets	20,000,000				22,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,023,000,000				1,020,000,000
Total Assets	1,350,000,000				1,392,000,000
Liabilities:
Risk Management Liabilities	30,000,000				30,000,000
Level 2 [Member]
Assets:
Cash and Cash Equivalents	1,000,000	[1]			1,000,000	[1]
Other Temporary Investments	7,000,000				8,000,000
Risk Management Assets
Risk Management Assets	609,000,000				565,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	930,000,000				901,000,000
Total Assets	1,547,000,000				1,475,000,000
Liabilities:
Risk Management Liabilities	512,000,000				499,000,000
Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]
Other Temporary Investments	0				0
Risk Management Assets
Risk Management Assets	130,000,000				142,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Total Assets	130,000,000				142,000,000
Liabilities:
Risk Management Liabilities	25,000,000				25,000,000
Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	275,000,000	[1]			101,000,000	[1]
Other Temporary Investments	12,000,000				11,000,000
Risk Management Assets
Risk Management Assets	(368,000,000)				(272,000,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	9,000,000				11,000,000
Total Assets	(72,000,000)				(149,000,000)
Liabilities:
Risk Management Liabilities	(370,000,000)				(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	2,000,000				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	32,000,000				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	15,000,000				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	(11,000,000)				(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	56,000,000				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	49,000,000				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)
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	8,000,000				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				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	5,000,000				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	23,000,000				19,000,000
Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	370,000,000	[10],[11]			440,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	178,000,000	[10],[11]			245,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	20,000,000	[10],[11]			22,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	30,000,000	[10],[11]			30,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	586,000,000	[10],[11]			549,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	485,000,000	[10],[11]			475,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	128,000,000	[10],[11]			142,000,000	[10],[12]
Liabilities:
Risk Management Liabilities	25,000,000	[10],[11]			22,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(364,000,000)	[10],[11]			(273,000,000)	[10],[12]
Liabilities:
Risk Management Liabilities	(362,000,000)	[10],[11]			(282,000,000)	[10],[12]
Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	116,000,000				132,000,000
Liabilities:
Risk Management Liabilities	23,000,000				22,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	1.45	[13]			11.42	[13]
Forward Price Range High	131.46	[13]			120.72	[13]
FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	14,000,000				10,000,000
Liabilities:
Risk Management Liabilities	2,000,000				3,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.05)	[13]			(5.10)	[13]
Forward Price Range High	9.17	[13]			10.44	[13]
Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	13,000,000	[10]			7,000,000	[10]
Liabilities:
Risk Management Liabilities	5,000,000	[10]			6,000,000	[10]
Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]
Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	21,000,000	[10]			15,000,000	[10]
Liabilities:
Risk Management Liabilities	15,000,000	[10]			11,000,000	[10]
Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	2,000,000	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			3,000,000	[10]
Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(10,000,000)	[10]			(8,000,000)	[10]
Liabilities:
Risk Management Liabilities	(10,000,000)	[10]			(8,000,000)	[10]
Interest Rate Foreign Currency Hedges [Member]
Liabilities:
Risk Management Liabilities	2,000,000				2,000,000
Interest Rate Foreign Currency Hedges [Member] | Level 1 [Member]
Liabilities:
Risk Management Liabilities	0				0
Interest Rate Foreign Currency Hedges [Member] | Level 2 [Member]
Liabilities:
Risk Management Liabilities	2,000,000				2,000,000
Interest Rate Foreign Currency Hedges [Member] | Level 3 [Member]
Liabilities:
Risk Management Liabilities	0				0
Interest Rate Foreign Currency Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities:
Risk Management Liabilities	0				0
Fair Value Hedges [Member]
Risk Management Assets
Risk Management Assets	4,000,000				4,000,000
Liabilities:
Risk Management Liabilities	12,000,000				14,000,000
Fair Value Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0				0
Liabilities:
Risk Management Liabilities	0				0
Fair Value Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	2,000,000				1,000,000
Liabilities:
Risk Management Liabilities	10,000,000				11,000,000
Fair Value Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0				0
Liabilities:
Risk Management Liabilities	0				0
Fair Value Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	2,000,000				3,000,000
Liabilities:
Risk Management Liabilities	2,000,000				3,000,000
Appalachian Power Co [Member]
Assets:
Cash and Cash Equivalents	13,572,000	[1]			2,750,000	[1]
Risk Management Assets
Risk Management Assets	29,985,000				38,119,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	43,557,000				40,869,000
Liabilities:
Risk Management Liabilities	12,565,000				19,133,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	10,562,000		10,979,000		10,979,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	29,162,000	[2],[3]	(1,456,000)	[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]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0
Purchases, Issuances and Settlements	(31,781,000)	[4]	257,000	[4]
Transfers into Level 3	(3,825,000)	[5],[6]	632,000	[5],[6]
Transfers out of Level 3	(6,000)	[6],[7]	(533,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	3,289,000	[8]	(1,123,000)	[8]
Ending Balance	7,401,000		8,756,000
Appalachian Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	13,536,000	[1]			2,714,000	[1]
Risk Management Assets
Risk Management Assets	393,000				827,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	13,929,000				3,541,000
Liabilities:
Risk Management Liabilities	306,000				700,000
Appalachian Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]
Risk Management Assets
Risk Management Assets	38,078,000				54,837,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	38,078,000				54,837,000
Liabilities:
Risk Management Liabilities	29,476,000				49,533,000
Appalachian Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]
Risk Management Assets
Risk Management Assets	10,508,000				12,097,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	10,508,000				12,097,000
Liabilities:
Risk Management Liabilities	3,107,000				1,535,000
Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	36,000	[1]			36,000	[1]
Risk Management Assets
Risk Management Assets	(18,994,000)				(29,642,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(18,958,000)				(29,606,000)
Liabilities:
Risk Management Liabilities	(20,324,000)				(32,635,000)
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	29,776,000	[10],[14]			37,756,000	[10],[14]
Liabilities:
Risk Management Liabilities	12,490,000	[10],[14]			18,846,000	[10],[14]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	393,000	[10],[14]			827,000	[10],[14]
Liabilities:
Risk Management Liabilities	306,000	[10],[14]			700,000	[10],[14]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	37,854,000	[10],[14]			54,448,000	[10],[14]
Liabilities:
Risk Management Liabilities	29,386,000	[10],[14]			49,220,000	[10],[14]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	10,508,000	[10],[14]			12,097,000	[10],[14]
Liabilities:
Risk Management Liabilities	3,107,000	[10],[14]			1,535,000	[10],[14]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(18,979,000)	[10],[14]			(29,616,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(20,309,000)	[10],[14]			(32,609,000)	[10],[14]
Appalachian Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	6,454,000				9,359,000
Liabilities:
Risk Management Liabilities	2,822,000				960,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	13.34				13.04
Forward Price Range High	59.60				80.50
Appalachian Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	4,054,000				2,738,000
Liabilities:
Risk Management Liabilities	285,000				575,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.05)				(5.10)
Forward Price Range High	9.17				10.44
Appalachian Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	209,000	[10]			363,000	[10]
Liabilities:
Risk Management Liabilities	75,000	[10]			287,000	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	224,000	[10]			389,000	[10]
Liabilities:
Risk Management Liabilities	90,000	[10]			313,000	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]
Appalachian Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(15,000)	[10]			(26,000)	[10]
Liabilities:
Risk Management Liabilities	(15,000)	[10]			(26,000)	[10]
Indiana Michigan Power Co [Member]
Risk Management Assets
Risk Management Assets	22,063,000				26,883,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,962,151,000				1,931,610,000
Total Assets	1,984,214,000				1,958,493,000
Liabilities:
Risk Management Liabilities	9,512,000				13,975,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	7,164,000		7,541,000		7,541,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	18,219,000	[2],[3]	(1,005,000)	[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]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0
Purchases, Issuances and Settlements	(19,995,000)	[4]	179,000	[4]
Transfers into Level 3	(2,594,000)	[5],[6]	434,000	[5],[6]
Transfers out of Level 3	(4,000)	[6],[7]	(366,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	2,052,000	[8]	(732,000)	[8]
Ending Balance	4,842,000		6,051,000
Indiana Michigan Power Co [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	267,000				561,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,023,721,000				1,020,593,000
Total Assets	1,023,988,000				1,021,154,000
Liabilities:
Risk Management Liabilities	208,000				475,000
Indiana Michigan Power Co [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	28,898,000				38,901,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	929,567,000				900,295,000
Total Assets	958,465,000				939,196,000
Liabilities:
Risk Management Liabilities	22,150,000				35,273,000
Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	6,945,000				8,205,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Total Assets	6,945,000				8,205,000
Liabilities:
Risk Management Liabilities	2,104,000				1,041,000
Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(14,047,000)				(20,784,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,863,000				10,722,000
Total Assets	(5,184,000)				(10,062,000)
Liabilities:
Risk Management Liabilities	(14,950,000)				(22,814,000)
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	21,921,000	[10],[14]			26,667,000	[10],[14]
Liabilities:
Risk Management Liabilities	9,461,000	[10],[14]			13,781,000	[10],[14]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	267,000	[10],[14]			561,000	[10],[14]
Liabilities:
Risk Management Liabilities	208,000	[10],[14]			475,000	[10],[14]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	28,746,000	[10],[14]			38,667,000	[10],[14]
Liabilities:
Risk Management Liabilities	22,089,000	[10],[14]			35,061,000	[10],[14]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	6,945,000	[10],[14]			8,205,000	[10],[14]
Liabilities:
Risk Management Liabilities	2,104,000	[10],[14]			1,041,000	[10],[14]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(14,037,000)	[10],[14]			(20,766,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(14,940,000)	[10],[14]			(22,796,000)	[10],[14]
Indiana Michigan Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	4,378,000				6,348,000
Liabilities:
Risk Management Liabilities	1,914,000				651,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	13.34				13.04
Forward Price Range High	59.60				80.50
Indiana Michigan Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	2,567,000				1,857,000
Liabilities:
Risk Management Liabilities	190,000				390,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.05)				(5.10)
Forward Price Range High	9.17				10.44
Indiana Michigan Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	142,000	[10]			216,000	[10]
Liabilities:
Risk Management Liabilities	51,000	[10]			194,000	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	152,000	[10]			234,000	[10]
Liabilities:
Risk Management Liabilities	61,000	[10]			212,000	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities:
Risk Management Liabilities	0	[10]			0	[10]
Indiana Michigan Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(10,000)	[10]			(18,000)	[10]
Liabilities:
Risk Management Liabilities	(10,000)	[10]			(18,000)	[10]
Ohio Power Co [Member]
Assets:
Cash and Cash Equivalents	32,066,000	[1]			19,399,000	[1]
Risk Management Assets
Risk Management Assets					3,082,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	36,046,000				22,481,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	2,920,000		15,429,000		15,429,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	30,963,000	[2],[3]	(2,055,000)	[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]	(1,988,000)	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0
Purchases, Issuances and Settlements	(34,036,000)	[4]	366,000	[4]
Transfers into Level 3	0	[5],[6]	888,000	[5],[6]
Transfers out of Level 3	0	[6],[7]	(749,000)	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	4,065,000	[8]	490,000	[8]
Ending Balance	3,912,000		12,381,000
Ohio Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	32,054,000	[1]			19,387,000	[1]
Risk Management Assets
Risk Management Assets					0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	32,054,000				19,387,000
Ohio Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]
Risk Management Assets
Risk Management Assets					162,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	76,000				162,000
Ohio Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]
Risk Management Assets
Risk Management Assets					3,269,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	3,990,000				3,269,000
Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	12,000	[1]			12,000	[1]
Risk Management Assets
Risk Management Assets					(349,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(74,000)				(337,000)
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	3,980,000	[10],[14]			2,920,000	[10],[14]
Liabilities:
Risk Management Liabilities	0	[10],[14]			0	[10],[14]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10],[14]			0	[10],[14]
Liabilities:
Risk Management Liabilities	0	[10],[14]			0	[10],[14]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	76,000	[10],[14]			0	[10],[14]
Liabilities:
Risk Management Liabilities	5,000	[10],[14]			0	[10],[14]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	3,990,000	[10],[14]			3,269,000	[10],[14]
Liabilities:
Risk Management Liabilities	78,000	[10],[14]			349,000	[10],[14]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(86,000)	[10],[14]			(349,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(83,000)	[10],[14]			(349,000)	[10],[14]
Ohio Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0				0
Liabilities:
Risk Management Liabilities	0				0
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	0				0
Forward Price Range High	0				0
Ohio Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	3,990,000				3,269,000
Liabilities:
Risk Management Liabilities	78,000				349,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.05)				(5.10)
Forward Price Range High	9.17				10.44
Ohio Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets					162,000	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets					0	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets					162,000	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets					0	[10]
Ohio Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets					0	[10]
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	0		0		0
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	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	[2]	0	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0
Purchases, Issuances and Settlements	0	[4]	0	[4]
Transfers into Level 3	0	[5],[6]	0	[5],[6]
Transfers out of Level 3	0	[6],[7]	0	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	349,000	[8]	0	[8]
Ending Balance	349,000		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	1,349,000	[10],[14]			1,083,000	[10],[14]
Liabilities:
Risk Management Liabilities	83,000	[10],[14]			85,000	[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]
Liabilities:
Risk Management Liabilities	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	922,000	[10],[14]			1,078,000	[10],[14]
Liabilities:
Risk Management Liabilities	4,000	[10],[14]			81,000	[10],[14]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	481,000	[10],[14]			0	[10],[14]
Liabilities:
Risk Management Liabilities	132,000	[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	(54,000)	[10],[14]			5,000	[10],[14]
Liabilities:
Risk Management Liabilities	(53,000)	[10],[14]			4,000	[10],[14]
Public Service Co Of Oklahoma [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0
Liabilities:
Risk Management Liabilities	0
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	0
Forward Price Range High	0
Public Service Co Of Oklahoma [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	481,000
Liabilities:
Risk Management Liabilities	132,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.05)
Forward Price Range High	9.17
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets					84,000	[10]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets					0	[10]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets					84,000	[10]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets					0	[10]
Public Service Co Of Oklahoma [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets					0	[10]
Southwestern Electric Power Co [Member]
Assets:
Cash and Cash Equivalents	17,995,000	[1]			17,241,000	[1]
Risk Management Assets
Risk Management Assets					1,179,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	19,902,000				18,420,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	0		0		0
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	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	[2]	0	[2]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	0		0
Purchases, Issuances and Settlements	0	[4]	0	[4]
Transfers into Level 3	0	[5],[6]	0	[5],[6]
Transfers out of Level 3	0	[6],[7]	0	[6],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	442,000	[8]	0	[8]
Ending Balance	442,000		0
Southwestern Electric Power Co [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	15,537,000	[1]			15,871,000	[1]
Risk Management Assets
Risk Management Assets					0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	15,537,000				15,871,000
Southwestern Electric Power Co [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]
Risk Management Assets
Risk Management Assets					1,330,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	1,471,000				1,330,000
Southwestern Electric Power Co [Member] | Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	[1]			0	[1]
Risk Management Assets
Risk Management Assets					0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	609,000				0
Southwestern Electric Power Co [Member] | Fair Value Inputs Other [Member]
Assets:
Cash and Cash Equivalents	2,458,000	[1]			1,370,000	[1]
Risk Management Assets
Risk Management Assets					(151,000)
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	2,285,000				1,219,000
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	1,907,000	[10],[14]			1,082,000	[10],[14]
Liabilities:
Risk Management Liabilities	0	[10],[14]			0	[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]
Liabilities:
Risk Management Liabilities	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	1,471,000	[10],[14]			1,233,000	[10],[14]
Liabilities:
Risk Management Liabilities	4,000	[10],[14]			154,000	[10],[14]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	609,000	[10],[14]			0	[10],[14]
Liabilities:
Risk Management Liabilities	167,000	[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	(173,000)	[10],[14]			(151,000)	[10],[14]
Liabilities:
Risk Management Liabilities	(171,000)	[10],[14]			(154,000)	[10],[14]
Southwestern Electric Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0
Liabilities:
Risk Management Liabilities	0
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	0
Forward Price Range High	0
Southwestern Electric Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	609,000
Liabilities:
Risk Management Liabilities	167,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(5.05)
Forward Price Range High	9.17
Southwestern Electric Power Co [Member] | Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets					97,000	[10]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets					0	[10]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets					97,000	[10]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets					0	[10]
Southwestern Electric Power Co [Member] | Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets					0	[10]
Cash [Member]
Assets:
Other Temporary Investments	206,000,000	[1]			250,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	12,000,000	[15]			19,000,000	[15]
Cash [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	187,000,000	[1]			231,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	3,000,000	[15]			8,000,000	[15]
Cash [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	7,000,000	[1]			8,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[15]			0	[15]
Cash [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0	[1]			0	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[15]			0	[15]
Cash [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	12,000,000	[1]			11,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	9,000,000	[15]			11,000,000	[15]
Cash [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	12,439,000	[16]			18,804,000	[16]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	3,576,000	[16]			8,082,000	[16]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[16]			0	[16]
Cash [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,863,000	[16]			10,722,000	[16]
Fixed Income Funds [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	930,000,000				901,000,000
Fixed Income Funds [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Fixed Income Funds [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	930,000,000				901,000,000
Fixed Income Funds [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Fixed Income Funds [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	929,567,000				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
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	929,567,000				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
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
Mutual Funds Fixed Income [Member]
Assets:
Other Temporary Investments	80,000,000				80,000,000
Mutual Funds Fixed Income [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	80,000,000				80,000,000
Mutual Funds Fixed Income [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	0				0
Mutual Funds Fixed Income [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0				0
Mutual Funds Fixed Income [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	0				0
Domestic [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,020,000,000	[17]			1,012,000,000	[17]
Domestic [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,020,000,000	[17]			1,012,000,000	[17]
Domestic [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]
Domestic [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]
Domestic [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]
Domestic [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,020,145,000	[17]			1,012,511,000	[17]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,020,145,000	[17]			1,012,511,000	[17]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]
Domestic [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[17]			0	[17]
Mutual Funds Equity [Member]
Assets:
Other Temporary Investments	24,000,000	[17]			23,000,000	[17]
Mutual Funds Equity [Member] | Level 1 [Member]
Assets:
Other Temporary Investments	24,000,000	[17]			23,000,000	[17]
Mutual Funds Equity [Member] | Level 2 [Member]
Assets:
Other Temporary Investments	0	[17]			0	[17]
Mutual Funds Equity [Member] | Level 3 [Member]
Assets:
Other Temporary Investments	0	[17]			0	[17]
Mutual Funds Equity [Member] | Fair Value Inputs Other [Member]
Assets:
Other Temporary Investments	0	[17]			0	[17]
Cash and Cash Equivalents [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	12,000,000				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	12,439,000				18,804,000
US Government Agencies Debt Securities [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	606,000,000				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
US Government Agencies Debt Securities [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	606,000,000				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
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
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	606,228,000				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
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	606,228,000				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
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
Corporate Debt [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	43,000,000				37,000,000
Corporate Debt [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Corporate Debt [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	43,000,000				37,000,000
Corporate Debt [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Corporate Debt [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Corporate Debt [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	42,727,000				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
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	42,727,000				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
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
State and Local Jurisdiction [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	281,000,000				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
State and Local Jurisdiction [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	281,000,000				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
State and Local Jurisdiction [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	280,612,000				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
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	280,612,000				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
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
Dedesignated Risk Management Contracts [Member]
Risk Management Assets
Risk Management Assets	4,000,000	[18]			6,000,000	[18]
Dedesignated Risk Management Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0	[18]			0	[18]
Dedesignated Risk Management Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	$ 4,000,000	[18]			$ 6,000,000	[18]

[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 March 31, 2014 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $2 million in 2014, $(11) million in periods 2015-2017 and $(1) million in periods 2018-2019; Level 2 matures $32 million in 2014, $56 million in periods 2015-2017, $8 million in periods 2018-2019 and $5 million in periods 2020-2030; Level 3 matures $15 million in 2014, $49 million in periods 2015-2017, $16 million in periods 2018-2019 and $23 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] 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 accrued interest receivables from financial institutions. Level 1 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 represent publicly traded equity securities and equity-based mutual funds.

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