Fair Value Assets and Liabilities (Details) $ in Thousands		3 Months Ended			6 Months Ended			12 Months Ended
		Jun. 30, 2015 USD ($) $ / MWh		Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) $ / MWh		Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) $ / MWh
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[1]	$ 195,000			$ 195,000			$ 163,000
Other Temporary Investments		356,000			356,000			386,000
Risk Management Assets
Risk Management Assets		535,000			535,000			472,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		2,106,000			2,106,000			2,096,000
Total Assets		3,192,000			3,192,000			3,117,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		252,000			252,000			223,000
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance		131,000		$ 105,000	151,000		$ 117,000	117,000
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	[2],[3]	2,000		(14,000)	12,000		82,000
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date	[2]	12,000			51,000		(9,000)
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income				6,000	(2,000)		14,000
Purchases, Issuances and Settlements	[4]	(16,000)		(2,000)	(54,000)		(102,000)
Transfers into Level 3	[5],[6]	42,000		5,000	21,000		1,000
Transfers out of Level 3	[6],[7]	(2,000)		(6,000)	(14,000)		(7,000)
Changes in Fair Value Allocated to Regulated Jurisdictions	[8]	34,000		38,000	38,000		36,000
Ending Balance		203,000		132,000	$ 203,000		132,000	$ 151,000
Level 3 Quantitative Information [Abstract]
Counterparty Credit Risk	[9]				3.28%			3.03%
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[1]	17,000			$ 17,000			$ 17,000
Other Temporary Investments		312,000			312,000			340,000
Risk Management Assets
Risk Management Assets		23,000			23,000			37,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		1,177,000			1,177,000			1,132,000
Total Assets		1,529,000			1,529,000			1,526,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		38,000			38,000			65,000
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[1]	6,000			6,000			1,000
Other Temporary Investments		7,000			7,000			9,000
Risk Management Assets
Risk Management Assets		548,000			548,000			561,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		918,000			918,000			953,000
Total Assets		1,479,000			1,479,000			1,524,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		477,000			477,000			467,000
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[1]	0			0			0
Other Temporary Investments		0			0			0
Risk Management Assets
Risk Management Assets		270,000			270,000			190,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Total Assets		270,000			270,000			190,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		67,000			67,000			39,000
Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[1]	172,000			172,000			145,000
Other Temporary Investments		37,000			37,000			37,000
Risk Management Assets
Risk Management Assets		(306,000)			(306,000)			(316,000)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		11,000			11,000			11,000
Total Assets		(86,000)			(86,000)			(123,000)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		(330,000)			(330,000)			(348,000)
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		(5,000)			(5,000)			(18,000)
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		16,000			16,000			31,000
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		33,000			33,000			50,000
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		(10,000)			(10,000)			(10,000)
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		53,000			53,000			52,000
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		59,000			59,000			29,000
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		8,000			8,000			12,000
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		22,000			22,000			9,000
2021 - 2032 [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		3,000			3,000			1,000
2021 - 2032 [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		93,000			93,000			66,000
Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	[10]	523,000	[11]		523,000	[11]		453,000	[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	227,000	[11]		227,000	[11]		199,000	[12]
Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	[10]	23,000	[11]		23,000	[11]		37,000	[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	38,000	[11]		38,000	[11]		65,000	[12]
Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	[10]	524,000	[11]		524,000	[11]		528,000	[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	444,000	[11]		444,000	[11]		432,000	[12]
Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	[10]	269,000	[11]		269,000	[11]		190,000	[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	62,000	[11]		62,000	[11]		36,000	[12]
Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	[10]	(293,000)	[11]		(293,000)	[11]		(302,000)	[12]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	(317,000)	[11]		(317,000)	[11]		(334,000)	[12]
Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		232,000			232,000			157,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 65,000			$ 65,000			$ 37,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[13]	13.5			13.5			11.37
Forward Price Range High | $ / MWh	[13]	163.52			163.52			159.92
Weighted Average Market Price | $ / MWh	[13]	37.79			37.79			57.18
FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		$ 38,000			$ 38,000			$ 33,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 2,000			$ 2,000			$ 2,000
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[13]	(8)			(8)			(14.63)
Forward Price Range High | $ / MWh	[13]	9.87			9.87			20.02
Weighted Average Market Price | $ / MWh	[13]	1.37			1.37			0.96
Commodity Hedges [Member]
Risk Management Assets
Risk Management Assets	[10]	$ 10,000			$ 10,000			$ 16,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	19,000			19,000			14,000
Commodity Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	[10]	0			0			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	0			0			0
Commodity Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	[10]	24,000			24,000			32,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	29,000			29,000			27,000
Commodity Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	[10]	1,000			1,000			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	5,000			5,000			3,000
Commodity Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	[10]	(15,000)			(15,000)			(16,000)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[10]	(15,000)			(15,000)			(16,000)
Interest Rate Foreign Currency Hedges [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		1,000			1,000			1,000
Interest Rate Foreign Currency Hedges [Member] | Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		0			0			0
Interest Rate Foreign Currency Hedges [Member] | Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		1,000			1,000			1,000
Interest Rate Foreign Currency Hedges [Member] | Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		0			0			0
Interest Rate Foreign Currency Hedges [Member] | Fair Value Inputs Other [Member]
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		0			0			0
Fair Value Hedges [Member]
Risk Management Assets
Risk Management Assets		2,000			2,000			3,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		5,000			5,000			9,000
Fair Value Hedges [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets		0			0			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		0			0			0
Fair Value Hedges [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets		0			0			1,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		3,000			3,000			7,000
Fair Value Hedges [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		0			0			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		0			0			0
Fair Value Hedges [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets		2,000			2,000			2,000
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		2,000			2,000			2,000
Appalachian Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	15,583			15,583			15,632
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		57,462			57,462			44,315
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance		5,987		7,401	15,742		10,562	10,562
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	[15],[16]	(1,380)		(4,046)	1,230		29,132
Purchases, Issuances and Settlements	[17]	(1,606)		(32)	(14,964)		(31,790)
Transfers into Level 3	[18],[19]			182			(3,643)
Transfers out of Level 3	[19],[20]	1,167		3	1,167		(2)
Changes in Fair Value Allocated to Regulated Jurisdictions	[21]	29,668		14,886	30,661		14,135
Ending Balance		33,836		18,394	33,836		18,394	15,742
Appalachian Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	15,565			15,565			15,599
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		15,741			15,741			15,805
Appalachian Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	0			0			0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		20,754			20,754			20,197
Appalachian Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	0			0			0
Risk Management Assets
Risk Management Assets		34,210			34,210			17,654
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		34,210			34,210			17,654
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		374			374			1,912
Appalachian Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	18			18			33
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		(13,243)			(13,243)			(9,341)
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	41,879			41,879			28,683
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	10,607			10,607			13,074
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	176			176			206
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	197			197			227
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	20,754			20,754			20,197
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	24,212			24,212			20,339
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	34,210			34,210			17,654
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	374			374			1,912
Appalachian Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	(13,261)			(13,261)			(9,374)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	(14,176)			(14,176)			(9,404)
Appalachian Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		10,570			10,570			5,801
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 183			$ 183			$ 1,799
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[24]	15.36			15.36			13.43
Forward Price Range High | $ / MWh	[24]	56.3			56.3			123.02
Weighted Average Market Price | $ / MWh	[24]	35.88			35.88			52.47
Appalachian Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		$ 23,640			$ 23,640			$ 11,853
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 191			$ 191			$ 113
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[24]	(6.16)			(6.16)			(14.63)
Forward Price Range High | $ / MWh	[24]	9.87			9.87			20.02
Weighted Average Market Price | $ / MWh	[24]	1.57			1.57			1.01
Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		$ 2,106,090			$ 2,106,090			$ 2,095,732
Total Assets		2,124,630			2,124,630			2,121,377
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance		5,573		4,842	14,704		7,164	7,164
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	[15],[16]	(802)		(2,554)	(825)		18,211
Purchases, Issuances and Settlements	[17]	(2,264)		(35)	(11,319)		(20,014)
Transfers into Level 3	[18],[19]			124			(2,471)
Transfers out of Level 3	[19],[20]	792		2	792		(2)
Changes in Fair Value Allocated to Regulated Jurisdictions	[21]	8,545		10,544	8,492		10,035
Ending Balance		11,844		12,923	11,844		12,923	14,704
Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		1,177,001			1,177,001			1,131,797
Total Assets		1,177,120			1,177,120			1,131,937
Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		918,046			918,046			953,387
Total Assets		933,474			933,474			969,280
Indiana Michigan Power Co [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		12,710			12,710			16,008
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Total Assets		12,710			12,710			16,008
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		866			866			1,304
Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		11,043			11,043			10,548
Total Assets		1,326			1,326			4,152
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	18,540			18,540			25,645
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	5,475			5,475			6,618
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	119			119			140
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	133			133			154
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	15,428			15,428			15,893
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	14,621			14,621			11,440
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	12,710			12,710			16,008
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	866			866			1,304
Indiana Michigan Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	(9,717)			(9,717)			(6,396)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	(10,145)			(10,145)			(6,280)
Indiana Michigan Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		9,184			9,184			6,375
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 116			$ 116			$ 1,219
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[24]	15.36			15.36			13.43
Forward Price Range High | $ / MWh	[24]	56.3			56.3			123.02
Weighted Average Market Price | $ / MWh	[24]	35.88			35.88			52.47
Indiana Michigan Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		$ 3,526			$ 3,526			$ 9,633
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 750			$ 750			$ 85
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[24]	(6.16)			(6.16)			(14.63)
Forward Price Range High | $ / MWh	[24]	9.87			9.87			20.02
Weighted Average Market Price | $ / MWh	[24]	1.57			1.57			1.01
Ohio Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]							$ 28,696
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets								81,040
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance		$ 45,942		3,912	$ 48,402		2,920	2,920
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	[15],[16]	638		(4,236)	1,548		30,768
Purchases, Issuances and Settlements	[17]	(1,691)		347	(8,368)		(33,688)
Transfers into Level 3	[18],[19]			0			0
Transfers out of Level 3	[19],[20]	0		0	0		0
Changes in Fair Value Allocated to Regulated Jurisdictions	[21]	(7,232)		9,277	(3,925)		9,300
Ending Balance		37,657		9,300	37,657		9,300	48,402
Ohio Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]							408
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets								408
Ohio Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]							0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets								0
Ohio Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]							0
Risk Management Assets
Risk Management Assets								52,343
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets								52,343
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities								3,941
Ohio Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]							28,288
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets								28,289
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	44,056			44,056			52,344
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	6,583			6,583			4,956
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	0			0			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	0			0			0
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	121			121			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	426			426			1,116
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	42,474			42,474			52,343
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	4,817			4,817			3,941
Ohio Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	1,461			1,461			1
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	1,340			1,340			(101)
Ohio Power Co [Member] | Energy Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		42,474			42,474			45,101
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 4,817			$ 4,817			$ 3,941
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[24]	42.89			42.89			48.25
Forward Price Range High | $ / MWh	[24]	163.52			163.52			159.92
Weighted Average Market Price | $ / MWh	[24]	91.51			91.51			84.04
Ohio Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets								$ 7,242
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities								$ 0
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[24]							(14.63)
Forward Price Range High | $ / MWh	[24]							20.02
Weighted Average Market Price | $ / MWh	[24]							1.01
Public Service Co Of Oklahoma [Member]
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance		$ (685)		349	$ (377)		0	$ 0
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	[15],[16]	766		(349)	(176)		0
Purchases, Issuances and Settlements	[17]	(81)		0	553		0
Transfers into Level 3	[18],[19]			0			0
Transfers out of Level 3	[19],[20]	0		0	0		0
Changes in Fair Value Allocated to Regulated Jurisdictions	[21]	1,699		(3)	1,699		(3)
Ending Balance		1,699		(3)	1,699		(3)	(377)
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	1,760			1,760			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	129			129			918
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	2			2			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	5			5			0
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	98			98			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	278			278			595
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	1,750			1,750			360
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	51			51			737
Public Service Co Of Oklahoma [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	(90)			(90)			(360)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	(205)			(205)			(414)
Public Service Co Of Oklahoma [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		1,750			1,750			360
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 51			$ 51			$ 737
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[24]	(6.16)			(6.16)			(14.63)
Forward Price Range High | $ / MWh	[24]	9.87			9.87			20.02
Weighted Average Market Price | $ / MWh	[24]	1.57			1.57			1.01
Southwestern Electric Power Co [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	$ 8,017			$ 8,017			$ 14,356
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		10,127			10,127			14,387
Changes in the Fair Value of Net Trading Derivatives and other investments
Beginning Balance		(1,222)		442	(460)		0	0
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)	[15],[16]	4,173		(442)	9,187		0
Purchases, Issuances and Settlements	[17]	(2,951)		0	(8,727)		0
Transfers into Level 3	[18],[19]			0			0
Transfers out of Level 3	[19],[20]	0		0	0		0
Changes in Fair Value Allocated to Regulated Jurisdictions	[21]	2,039		(3)	2,039		(3)
Ending Balance		2,039		$ (3)	2,039		$ (3)	(460)
Southwestern Electric Power Co [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	6,391			6,391			12,660
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		6,394			6,394			12,660
Southwestern Electric Power Co [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	0			0			0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		114			114			31
Southwestern Electric Power Co [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	0			0			0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		2,100			2,100			439
Southwestern Electric Power Co [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents	[14]	1,626			1,626			1,696
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets		1,519			1,519			1,257
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	2,110			2,110			31
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	2,523			2,523			1,082
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 1 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	3			3			0
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	6			6			0
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 2 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	114			114			31
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	2,697			2,697			684
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	2,100			2,100			439
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	61			61			899
Southwestern Electric Power Co [Member] | Risk Management Commodity Contracts [Member] | Fair Value Inputs Other [Member]
Risk Management Assets
Risk Management Assets	[22],[23]	(107)			(107)			(439)
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities	[22],[23]	(241)			(241)			(501)
Southwestern Electric Power Co [Member] | FTRs [Member] | Level 3 [Member]
Risk Management Assets
Risk Management Assets		2,100			2,100			439
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities		$ 61			$ 61			$ 899
Level 3 Quantitative Information [Abstract]
Forward Price Range Low | $ / MWh	[24]	(6.16)			(6.16)			(14.63)
Forward Price Range High | $ / MWh	[24]	9.87			9.87			20.02
Weighted Average Market Price | $ / MWh	[24]	1.57			1.57			1.01
Cash [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[1],[25]	$ 249,000			$ 249,000			$ 280,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[26]	53,000			53,000			20,000
Cash [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[1]	205,000			205,000			234,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[26]	42,000			42,000			9,000
Cash [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[1]	7,000			7,000			9,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[26]	0			0			0
Cash [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[1]	0			0			0
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[26]	0			0			0
Cash [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[1]	37,000			37,000			37,000
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[26]	11,000			11,000			11,000
Cash [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[27]	52,861			52,861			19,966
Cash [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[27]	41,818			41,818			9,418
Cash [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[27]	0			0			0
Cash [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[27]	0			0			0
Cash [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[27]	11,043			11,043			10,548
Fixed Income Funds [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		918,000			918,000			953,000
Fixed Income Funds [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Fixed Income Funds [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		918,000			918,000			953,000
Fixed Income Funds [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Fixed Income Funds [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		918,046			918,046			953,387
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		918,046			918,046			953,387
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Fixed Income Funds [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Mutual Funds Fixed Income [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments		81,000			81,000			81,000
Mutual Funds Fixed Income [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments		81,000			81,000			81,000
Mutual Funds Fixed Income [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments		0			0			0
Mutual Funds Fixed Income [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments		0			0			0
Mutual Funds Fixed Income [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments		0			0			0
Domestic [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[28]	1,135,000			1,135,000			1,123,000
Domestic [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[28]	1,135,000			1,135,000			1,123,000
Domestic [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[28]	0			0			0
Domestic [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[28]	0			0			0
Domestic [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[28]	0			0			0
Domestic [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[29]	1,135,183			1,135,183			1,122,379
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[29]	1,135,183			1,135,183			1,122,379
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[29]	0			0			0
Domestic [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[29]	0			0			0
Domestic [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	[29]	0			0			0
Mutual Funds Equity [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[28]	26,000			26,000			25,000
Mutual Funds Equity [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[28]	26,000			26,000			25,000
Mutual Funds Equity [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[28]	0			0			0
Mutual Funds Equity [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[28]	0			0			0
Mutual Funds Equity [Member] | Fair Value Inputs Other [Member]
Assets, Fair Value Disclosure [Abstract]
Other Temporary Investments	[28]	0			0			0
Cash and Cash Equivalents [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		53,000			53,000			20,000
Cash and Cash Equivalents [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		52,861			52,861			19,966
US Government Agencies Debt Securities [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		786,000			786,000			697,000
US Government Agencies Debt Securities [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
US Government Agencies Debt Securities [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		786,000			786,000			697,000
US Government Agencies Debt Securities [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
US Government Agencies Debt Securities [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		786,222			786,222			697,042
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		786,222			786,222			697,042
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
US Government Agencies Debt Securities [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Corporate Debt [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		62,000			62,000			48,000
Corporate Debt [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Corporate Debt [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		62,000			62,000			48,000
Corporate Debt [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Corporate Debt [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Corporate Debt [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		61,654			61,654			47,792
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		61,654			61,654			47,792
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
Corporate Debt [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
State and Local Jurisdiction [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		70,000			70,000			208,000
State and Local Jurisdiction [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
State and Local Jurisdiction [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		70,000			70,000			208,000
State and Local Jurisdiction [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
State and Local Jurisdiction [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		70,170			70,170			208,553
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member] | Level 1 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member] | Level 2 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		70,170			70,170			208,553
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member] | Level 3 [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0			0			0
State and Local Jurisdiction [Member] | Indiana Michigan Power Co [Member] | Fair Value Inputs Other [Member]
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		$ 0			$ 0			$ 0

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

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

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

[4] Represents the settlement of risk management commodity contracts for the reporting period.

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

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

[7] Represents existing assets or liabilities that were previously categorized as Level 3.

[8] Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income. These net gains (losses) are recorded as regulatory liabilities/assets.

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

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

[11] The June 30, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures ($5) million in 2015 and ($10) million in periods 2016-2018; Level 2 matures $16 million in 2015, $53 million in periods 2016-2018, $8 million in periods 2019-2020 and $3 million in periods 2021-2032; Level 3 matures $33 million in 2015, $59 million in periods 2016-2018, $22 million in periods 2019-2020 and $93 million in periods 2021-2032. 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] Included in revenues on the condensed statements of income.

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

[17] Represents the settlement of risk management commodity contracts for the reporting period.

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

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

[20] Represents existing assets or liabilities that were previously categorized as Level 3.

[21] 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.

[22] 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.”

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

[24] Represents market prices in dollars per MWh.

[25] Primarily represents amounts held for the repayment of debt.

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

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

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

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