Fair Value Assets and Liabilities (Details) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	$ 190,000,000	[1]			$ 163,000,000	[1]
Other Temporary Investments	293,000,000				386,000,000
Risk Management Assets
Risk Management Assets	503,000,000				472,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,122,000,000				2,096,000,000
Total Assets	3,108,000,000				3,117,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	239,000,000				223,000,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	151,000,000		117,000,000		117,000,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	9,000,000	[2],[3]	84,000,000	[2],[3]
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	5,000,000	[3]	(10,000,000)	[3]
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income	(2,000,000)		9,000,000
Purchases, Issuances and Settlements	(39,000,000)	[4]	(100,000,000)	[4]
Transfers into Level 3	15,000,000	[5],[6]	(4,000,000)	[5],[6]
Transfers out of Level 3	(12,000,000)	[5],[7]	(2,000,000)	[5],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	4,000,000	[8]	11,000,000	[8]
Ending Balance	131,000,000		105,000,000		151,000,000
Level 3 Quantitative Information [Abstract]
Counterparty Credit Risk	3.73%	[9]			3.03%	[9]
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	21,000,000	[1]			17,000,000	[1]
Other Temporary Investments	278,000,000				340,000,000
Risk Management Assets
Risk Management Assets	35,000,000				37,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,158,000,000				1,132,000,000
Total Assets	1,492,000,000				1,526,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	54,000,000				65,000,000
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	6,000,000	[1]			1,000,000	[1]
Other Temporary Investments	2,000,000				9,000,000
Risk Management Assets
Risk Management Assets	565,000,000				561,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	956,000,000				953,000,000
Total Assets	1,529,000,000				1,524,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	445,000,000				467,000,000
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[1]			0	[1]
Other Temporary Investments	0				0
Risk Management Assets
Risk Management Assets	166,000,000				190,000,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Total Assets	166,000,000				190,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	35,000,000				39,000,000
Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	163,000,000	[1]			145,000,000	[1]
Other Temporary Investments	13,000,000				37,000,000
Risk Management Assets
Risk Management Assets	(263,000,000)				(316,000,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,000,000				11,000,000
Total Assets	(79,000,000)				(123,000,000)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(295,000,000)				(348,000,000)
2015 [Member] | Level 1 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	(8,000,000)				(18,000,000)
2015 [Member] | Level 2 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	19,000,000				31,000,000
2015 [Member] | Level 3 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	23,000,000				50,000,000
2016 - 2018 [Member] | Level 1 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	(11,000,000)				(10,000,000)
2016 - 2018 [Member] | Level 2 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	60,000,000				52,000,000
2016 - 2018 [Member] | Level 3 [Member]
Fair Value Measurements 1 (Textuals) [Abstract]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities	31,000,000				29,000,000
2019 - 2020 [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	21,000,000				12,000,000
2019 - 2020 [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	9,000,000				9,000,000
2021 - 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	27,000,000				1,000,000
2021 - 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	72,000,000				66,000,000
Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	496,000,000	[10],[11]			453,000,000	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	221,000,000	[10],[11]			199,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	35,000,000	[10],[11]			37,000,000	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	54,000,000	[10],[11]			65,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	555,000,000	[10],[11]			528,000,000	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	428,000,000	[10],[11]			432,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	165,000,000	[10],[11]			190,000,000	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	30,000,000	[10],[11]			36,000,000	[10],[12]
Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(259,000,000)	[10],[11]			(302,000,000)	[10],[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(291,000,000)	[10],[11]			(334,000,000)	[10],[12]
Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	160,000,000				157,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	32,000,000				37,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	0.53	[13]			11.37	[13]
Forward Price Range High	163.52	[13]			159.92	[13]
Weighted Average Market Price	37.67	[13]			57.18	[13]
FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	6,000,000				33,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	3,000,000				2,000,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(10.12)	[13]			(14.63)	[13]
Forward Price Range High	10.85	[13]			20.02	[13]
Weighted Average Market Price	0.57	[13]			0.96	[13]
Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	4,000,000	[10]			16,000,000	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	12,000,000	[10]			14,000,000	[10]
Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0	[10]			0	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0	[10]			0	[10]
Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	10,000,000	[10]			32,000,000	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	14,000,000	[10]			27,000,000	[10]
Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	1,000,000	[10]			0	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	5,000,000	[10]			3,000,000	[10]
Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(7,000,000)	[10]			(16,000,000)	[10]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(7,000,000)	[10]			(16,000,000)	[10]
Interest Rate Foreign Currency Hedges [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,000,000				1,000,000
Interest Rate Foreign Currency Hedges [Member] | Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	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
Interest Rate Foreign Currency Hedges [Member] | Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0				0
Interest Rate Foreign Currency Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0				0
Fair Value Hedges [Member]
Risk Management Assets
Risk Management Assets	3,000,000				3,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	5,000,000				9,000,000
Fair Value Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	0				0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0				0
Fair Value Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	0				1,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	2,000,000				7,000,000
Fair Value Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	0				0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	0				0
Fair Value Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	3,000,000				2,000,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	3,000,000				2,000,000
Appalachian Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	7,917,000	[14]			15,632,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	24,458,000				44,315,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	15,742,000		10,562,000		10,562,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	2,163,000	[2],[3]	29,162,000	[2],[3]
Purchases, Issuances and Settlements	(13,355,000)	[4]	(31,781,000)	[4]
Transfers into Level 3			(3,825,000)	[5],[6]
Transfers out of Level 3			(6,000)	[5],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	1,437,000	[8]	3,289,000	[8]
Ending Balance	5,987,000		7,401,000
Appalachian Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	7,884,000	[14]			15,599,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	8,110,000				15,805,000
Appalachian Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	16,014,000				20,197,000
Appalachian Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]
Risk Management Assets
Risk Management Assets	7,864,000				17,654,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	7,864,000				17,654,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,877,000				1,912,000
Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	33,000	[14]			33,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(7,530,000)				(9,341,000)
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	16,541,000	[15],[16]			28,683,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	10,694,000	[15],[16]			13,074,000	[15],[16]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	226,000	[15],[16]			206,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	244,000	[15],[16]			227,000	[15],[16]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	16,014,000	[15],[16]			20,197,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	16,813,000	[15],[16]			20,339,000	[15],[16]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	7,864,000	[15],[16]			17,654,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,877,000	[15],[16]			1,912,000	[15],[16]
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(7,563,000)	[15],[16]			(9,374,000)	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(8,240,000)	[15],[16]			(9,404,000)	[15],[16]
Appalachian Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	5,805,000				5,801,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,646,000				1,799,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	10.55	[13]			13.43	[13]
Forward Price Range High	51.25	[13]			123.02	[13]
Weighted Average Market Price	36.89	[13]			52.47	[13]
Appalachian Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	2,059,000				11,853,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	231,000				113,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(9.62)	[13]			(14.63)	[13]
Forward Price Range High	6.77	[13]			20.02	[13]
Weighted Average Market Price	0.62	[13]			1.01	[13]
Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,122,387,000				2,095,732,000
Total Assets	2,135,161,000				2,121,377,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	14,704,000		7,164,000		7,164,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	117,000	[2],[3]	18,219,000	[2],[3]
Purchases, Issuances and Settlements	(9,053,000)	[4]	(19,995,000)	[4]
Transfers into Level 3			(2,594,000)	[5],[6]
Transfers out of Level 3			(4,000)	[5],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	(195,000)	[8]	2,052,000	[8]
Ending Balance	5,573,000		4,842,000
Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,158,336,000				1,131,797,000
Total Assets	1,158,489,000				1,131,937,000
Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	956,047,000				953,387,000
Total Assets	966,718,000				969,280,000
Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	6,832,000				16,008,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Total Assets	6,832,000				16,008,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,259,000				1,304,000
Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,004,000				10,548,000
Total Assets	3,122,000				4,152,000
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	12,774,000	[15],[16]			25,645,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	6,186,000	[15],[16]			6,618,000	[15],[16]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	153,000	[15],[16]			140,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	166,000	[15],[16]			154,000	[15],[16]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	10,671,000	[15],[16]			15,893,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	9,958,000	[15],[16]			11,440,000	[15],[16]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	6,832,000	[15],[16]			16,008,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,259,000	[15],[16]			1,304,000	[15],[16]
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(4,882,000)	[15],[16]			(6,396,000)	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(5,197,000)	[15],[16]			(6,280,000)	[15],[16]
Indiana Michigan Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	5,189,000				6,375,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,117,000				1,219,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	10.55	[13]			13.43	[13]
Forward Price Range High	51.25	[13]			123.02	[13]
Weighted Average Market Price	36.89	[13]			52.47	[13]
Indiana Michigan Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	1,643,000				9,633,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	142,000				85,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(9.62)	[13]			(14.63)	[13]
Forward Price Range High	6.77	[13]			20.02	[13]
Weighted Average Market Price	0.62	[13]			1.01	[13]
Ohio Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	17,134,000	[14]			28,696,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	68,828,000				81,040,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	48,402,000		2,920,000		2,920,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	215,000	[2],[3]	30,963,000	[2],[3]
Purchases, Issuances and Settlements	(6,745,000)	[4]	(34,036,000)	[4]
Transfers into Level 3			0	[5],[6]
Transfers out of Level 3			0	[5],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	4,070,000	[8]	4,065,000	[8]
Ending Balance	45,942,000		3,912,000
Ohio Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	17,125,000	[14]			408,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	17,125,000				408,000
Ohio Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	0				0
Ohio Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]
Risk Management Assets
Risk Management Assets	50,536,000				52,343,000
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	50,536,000				52,343,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	4,594,000				3,941,000
Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	9,000	[14]			28,288,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	1,167,000				28,289,000
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	51,694,000	[15],[16]			52,344,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	5,783,000	[15],[16]			4,956,000	[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]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	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]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	835,000	[15],[16]			1,116,000	[15],[16]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	50,536,000	[15],[16]			52,343,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	4,594,000	[15],[16]			3,941,000	[15],[16]
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	1,158,000	[15],[16]			1,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	354,000	[15],[16]			(101,000)	[15],[16]
Ohio Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	49,233,000				45,101,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	4,564,000				3,941,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	44.41	[13]			48.25	[13]
Forward Price Range High	163.52	[13]			159.92	[13]
Weighted Average Market Price	91.73	[13]			84.04	[13]
Ohio Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	1,303,000				7,242,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	30,000				0
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(9.62)	[13]			(14.63)	[13]
Forward Price Range High	6.77	[13]			20.02	[13]
Weighted Average Market Price	0.62	[13]			1.01	[13]
Public Service Co Of Oklahoma [Member]
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	(377,000)		0		0
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	(259,000)	[2],[3]	0	[2],[3]
Purchases, Issuances and Settlements	635,000	[4]	0	[4]
Transfers into Level 3			0	[5],[6]
Transfers out of Level 3			0	[5],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	(684,000)	[8]	349,000	[8]
Ending Balance	(685,000)		349,000
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	9,000	[15],[16]			0	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	702,000	[15],[16]			918,000	[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]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	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	18,000	[15],[16]			0	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	455,000	[15],[16]			595,000	[15],[16]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	130,000	[15],[16]			360,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	815,000	[15],[16]			737,000	[15],[16]
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(139,000)	[15],[16]			(360,000)	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(568,000)	[15],[16]			(414,000)	[15],[16]
Public Service Co Of Oklahoma [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	130,000				360,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	815,000				737,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(9.62)	[13]			(14.63)	[13]
Forward Price Range High	6.77	[13]			20.02	[13]
Weighted Average Market Price	0.62	[13]			1.01	[13]
Southwestern Electric Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	7,975,000	[14]			14,356,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	7,986,000				14,387,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance	(460,000)		0		0
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	5,809,000	[2],[3]	0	[2],[3]
Purchases, Issuances and Settlements	(5,351,000)	[4]	0	[4]
Transfers into Level 3			0	[5],[6]
Transfers out of Level 3			0	[5],[7]
Changes in Fair Value Allocated to Regulated Jurisdictions	(1,220,000)	[8]	442,000	[8]
Ending Balance	(1,222,000)		442,000
Southwestern Electric Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	6,199,000	[14]			12,660,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	6,199,000				12,660,000
Southwestern Electric Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	23,000				31,000
Southwestern Electric Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	0	[14]			0	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	161,000				439,000
Southwestern Electric Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	1,776,000	[14]			1,696,000	[14]
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	1,603,000				1,257,000
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	11,000	[15],[16]			31,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	4,197,000	[15],[16]			1,082,000	[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]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	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	23,000	[15],[16]			31,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	3,478,000	[15],[16]			684,000	[15],[16]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	161,000	[15],[16]			439,000	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,383,000	[15],[16]			899,000	[15],[16]
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	(173,000)	[15],[16]			(439,000)	[15],[16]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	(664,000)	[15],[16]			(501,000)	[15],[16]
Southwestern Electric Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	161,000				439,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	1,383,000				899,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low	(9.62)	[13]			(14.63)	[13]
Forward Price Range High	6.77	[13]			20.02	[13]
Weighted Average Market Price	0.62	[13]			1.01	[13]
Cash [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	186,000,000	[1],[17]			280,000,000	[1],[17]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	31,000,000	[18]			20,000,000	[18]
Cash [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	171,000,000	[1]			234,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	23,000,000	[18]			9,000,000	[18]
Cash [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	2,000,000	[1]			9,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[18]			0	[18]
Cash [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0	[1]			0	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[18]			0	[18]
Cash [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	13,000,000	[1]			37,000,000	[1]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,000,000	[18]			11,000,000	[18]
Cash [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	30,731,000	[19]			19,966,000	[19]
Cash [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	22,727,000	[19]			9,418,000	[19]
Cash [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]
Cash [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]
Cash [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	8,004,000	[19]			10,548,000	[19]
Fixed Income Funds [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	956,000,000				953,000,000
Fixed Income Funds [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
Fixed Income Funds [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	956,000,000				953,000,000
Fixed Income Funds [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0				0
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	956,047,000				953,387,000
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	956,047,000				953,387,000
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, Fair Value Disclosure [Abstract]
Other Temporary Investments	81,000,000				81,000,000
Mutual Funds Fixed Income [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	81,000,000				81,000,000
Mutual Funds Fixed Income [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0				0
Mutual Funds Fixed Income [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0				0
Mutual Funds Fixed Income [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0				0
Domestic [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,135,000,000	[20]			1,123,000,000	[20]
Domestic [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,135,000,000	[20]			1,123,000,000	[20]
Domestic [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[20]			0	[20]
Domestic [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[20]			0	[20]
Domestic [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[20]			0	[20]
Domestic [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,135,609,000	[20]			1,122,379,000	[20]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,135,609,000	[20]			1,122,379,000	[20]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[20]			0	[20]
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0	[20]			0	[20]
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	[20]			0	[20]
Mutual Funds Equity [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	26,000,000	[20]			25,000,000	[20]
Mutual Funds Equity [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	26,000,000	[20]			25,000,000	[20]
Mutual Funds Equity [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0	[20]			0	[20]
Mutual Funds Equity [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0	[20]			0	[20]
Mutual Funds Equity [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	0	[20]			0	[20]
Cash and Cash Equivalents [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	31,000,000				20,000,000
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	30,731,000				19,966,000
US Government Agencies Debt Securities [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	695,000,000				697,000,000
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	695,000,000				697,000,000
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	695,576,000				697,042,000
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	695,576,000				697,042,000
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	60,000,000				48,000,000
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	60,000,000				48,000,000
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	59,764,000				47,792,000
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	59,764,000				47,792,000
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	201,000,000				208,000,000
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	201,000,000				208,000,000
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	200,707,000				208,553,000
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	200,707,000				208,553,000
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

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

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

[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, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $(8) million in 2015 and ($11) million in periods 2016-2018; Level 2 matures $19 million in 2015, $60 million in periods 2016-2018, $21 million in periods 2019-2020 and $27 million in periods 2021-2030; Level 3 matures $23 million in 2015, $31 million in periods 2016-2018, $9 million in periods 2019-2020 and $72 million in periods 2021-2030. Risk management commodity contracts are substantially comprised of power contracts.

[12] The December 31, 2014 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $(18) million in 2015 and ($10) million in periods 2016-2018; Level 2 matures $31 million in 2015, $52 million in periods 2016-2018, $12 million in periods 2019-2020 and $1 million in periods 2021-2030; Level 3 matures $50 million in 2015, $29 million in periods 2016-2018, $9 million in periods 2019-2020 and $66 million in periods 2021-2030. 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] Primarily represents amounts held for the repayment of debt.

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

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