Derivatives and Hedging (Details) gal in Thousands, T in Thousands, MWh in Thousands, MMBTU in Thousands, $ in Thousands		3 Months Ended			6 Months Ended			12 Months Ended
		Jun. 30, 2015 USD ($) MWh MMBTU T gal		Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) MWh MMBTU T gal		Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) MWh MMBTU T gal
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		$ 3,000			$ 3,000			$ 4,000
Cash Collateral Paid Netted Against Risk Management Liabilities		27,000			27,000			35,000
Fair Value of Derivative Instruments
Current Risk Management Assets		172,000			172,000			178,000
Long-term Risk Management Assets		363,000			363,000			294,000
Total Assets		535,000			535,000			472,000
Current Risk Management Liabilities		78,000			78,000			92,000
Long-term Risk Management Liabilities		174,000			174,000			131,000
Total Liabilities		252,000			252,000			223,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		64,000		$ 49,000	120,000		$ 188,000
Gain (Loss) on Hedging Instruments
Gain (Loss) on Fair Value Hedging Instruments		1,000		2,000	6,000		4,000
Gain (Loss) on Fair Value Portion of Long Term Debt		(1,000)		(2,000)	(6,000)		(4,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[1]	10,000			10,000			16,000
Hedging Liabilities	[1]	20,000			20,000			15,000
AOCI Gain (Loss) Net of Tax		(23,000)			(23,000)			(18,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					$ 3,000			2,000
Maximum Term for Exposure to Variability of Future Cash Flows					90 months
Collateral Triggering Events [Abstract]
Fair Value of Contracts with Credit Downgrade Triggers		0			$ 0			0
Amount of Collateral AEP Subsidiaries Would Have been Required to Post for Derivative Contracts as well as Derivative and Non-Derivative Contracts Subject to the Same Master Netting Arrangement		0			0			0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs		31,000			31,000			36,000
Amount of Collateral Attributable to Other Contracts	[2]	304,000			304,000			281,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		287,000			287,000			235,000
Amount of Cash Collateral Posted		5,000			5,000			9,000
Additional Settlement Liability if Cross Default Provision is Triggered		225,000			225,000			178,000
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets		3,000			3,000			4,000
Cash Collateral Paid Netted Against Risk Management Liabilities		27,000			$ 27,000			35,000
Maximum Term for Exposure to Variability of Future Cash Flows					90 months
Appalachian Power Co [Member]
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		0			$ 0			68
Cash Collateral Paid Netted Against Risk Management Liabilities		915			915			98
Fair Value of Derivative Instruments
Current Risk Management Assets		38,877			38,877			23,792
Long-term Risk Management Assets		3,002			3,002			4,891
Current Risk Management Liabilities		9,159			9,159			11,017
Long-term Risk Management Liabilities		1,448			1,448			2,057
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		28,000		14,902	$ 31,591		52,085
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows
Collateral Triggering Events [Abstract]
Fair Value of Contracts with Credit Downgrade Triggers		0			$ 0			0
Amount of Collateral AEP Subsidiaries Would Have been Required to Post for Derivative Contracts as well as Derivative and Non-Derivative Contracts Subject to the Same Master Netting Arrangement		0			0			0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs		3,211			3,211			6,339
Amount of Collateral Attributable to Other Contracts		987			987			74
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		6,795			6,795			9,043
Amount of Cash Collateral Posted		0			0			0
Additional Settlement Liability if Cross Default Provision is Triggered		6,715			6,715			9,012
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets		0			0			68
Cash Collateral Paid Netted Against Risk Management Liabilities		915			$ 915			98
Maximum Term for Exposure to Variability of Future Cash Flows
Indiana Michigan Power Co [Member]
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		0			$ 0			163
Cash Collateral Paid Netted Against Risk Management Liabilities		428			428			47
Fair Value of Derivative Instruments
Current Risk Management Assets		16,514			16,514			22,328
Long-term Risk Management Assets		2,026			2,026			3,317
Current Risk Management Liabilities		4,493			4,493			5,223
Long-term Risk Management Liabilities		982			982			1,395
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		10,292		9,816	$ 9,892		34,068
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows
Collateral Triggering Events [Abstract]
Fair Value of Contracts with Credit Downgrade Triggers		0			$ 0			0
Amount of Collateral AEP Subsidiaries Would Have been Required to Post for Derivative Contracts as well as Derivative and Non-Derivative Contracts Subject to the Same Master Netting Arrangement		0			0			0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs		2,178			2,178			4,299
Amount of Collateral Attributable to Other Contracts		215			215			47
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		4,609			4,609			6,134
Amount of Cash Collateral Posted		0			0			0
Additional Settlement Liability if Cross Default Provision is Triggered		4,554			4,554			6,113
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets		0			0			163
Cash Collateral Paid Netted Against Risk Management Liabilities		428			$ 428			47
Maximum Term for Exposure to Variability of Future Cash Flows
Ohio Power Co [Member]
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		0			$ 0			0
Cash Collateral Paid Netted Against Risk Management Liabilities		121			121			102
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			7,242
Long-term Risk Management Assets		44,056			44,056			45,102
Current Risk Management Liabilities		2,010			2,010			1,943
Long-term Risk Management Liabilities		4,573			4,573			3,013
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(7,462)		6,460	$ (3,082)		41,559
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows
Collateral Triggering Events [Abstract]
Fair Value of Contracts with Credit Downgrade Triggers		0			$ 0			0
Amount of Collateral AEP Subsidiaries Would Have been Required to Post for Derivative Contracts as well as Derivative and Non-Derivative Contracts Subject to the Same Master Netting Arrangement		0			0			0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs		0			0			0
Amount of Collateral Attributable to Other Contracts		0			0			0
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		0			0			0
Amount of Cash Collateral Posted		0			0			0
Additional Settlement Liability if Cross Default Provision is Triggered		0			0			0
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets		0			0			0
Cash Collateral Paid Netted Against Risk Management Liabilities		121			$ 121			102
Maximum Term for Exposure to Variability of Future Cash Flows
Public Service Co Of Oklahoma [Member]
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		0			$ 0			0
Cash Collateral Paid Netted Against Risk Management Liabilities		115			115			54
Fair Value of Derivative Instruments
Current Risk Management Assets		1,731			1,731			0
Long-term Risk Management Assets		29			29			0
Current Risk Management Liabilities		129			129			918
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		7,076		(318)	$ 6,046		449
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows
Collateral Triggering Events [Abstract]
Fair Value of Contracts with Credit Downgrade Triggers		0			$ 0			0
Amount of Collateral AEP Subsidiaries Would Have been Required to Post for Derivative Contracts as well as Derivative and Non-Derivative Contracts Subject to the Same Master Netting Arrangement		0			0			0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs		244			244			693
Amount of Collateral Attributable to Other Contracts		6,783			6,783			4,111
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		0			0			0
Amount of Cash Collateral Posted		0			0			0
Additional Settlement Liability if Cross Default Provision is Triggered		0			0			0
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets		0			0			0
Cash Collateral Paid Netted Against Risk Management Liabilities		115			$ 115			54
Maximum Term for Exposure to Variability of Future Cash Flows
Southwestern Electric Power Co [Member]
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		0			$ 0			0
Cash Collateral Paid Netted Against Risk Management Liabilities		134			134			62
Fair Value of Derivative Instruments
Current Risk Management Assets		2,077			2,077			31
Long-term Risk Management Assets		33			33			0
Current Risk Management Liabilities		2,523			2,523			1,082
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		11,321		(1,114)	$ 11,490		242
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows
Collateral Triggering Events [Abstract]
Fair Value of Contracts with Credit Downgrade Triggers		0			$ 0			0
Amount of Collateral AEP Subsidiaries Would Have been Required to Post for Derivative Contracts as well as Derivative and Non-Derivative Contracts Subject to the Same Master Netting Arrangement		0			0			0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs		293			293			877
Amount of Collateral Attributable to Other Contracts		210			210			166
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		0			0			0
Amount of Cash Collateral Posted		0			0			0
Additional Settlement Liability if Cross Default Provision is Triggered		0			0			0
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets		0			0			0
Cash Collateral Paid Netted Against Risk Management Liabilities		134			$ 134			62
Maximum Term for Exposure to Variability of Future Cash Flows
Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Total Assets	[3]	523,000	[4]		$ 523,000	[4]		453,000	[5]
Total Liabilities	[3]	227,000	[4]		227,000	[4]		199,000	[5]
Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	41,879			41,879			28,683
Total Liabilities	[6],[7]	10,607			10,607			13,074
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	18,540			18,540			25,645
Total Liabilities	[6],[7]	5,475			5,475			6,618
Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	44,056			44,056			52,344
Total Liabilities	[6],[7]	6,583			6,583			4,956
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	1,760			1,760			0
Total Liabilities	[6],[7]	129			129			918
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	2,110			2,110			31
Total Liabilities	[6],[7]	2,523			2,523			1,082
Commodity [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[1]	10,000			10,000			16,000
Hedging Liabilities	[1]	19,000			19,000			14,000
AOCI Gain (Loss) Net of Tax		(5,000)			(5,000)			1,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					4,000			4,000
Derivatives and Hedging (Textuals) [Abstract]
Cross Default Provisions Maximum Third Party Obligation Amount		50,000			50,000			50,000
Commodity [Member] | Appalachian Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		0			0			0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					0			0
Commodity [Member] | Indiana Michigan Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		0			0			0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					0			0
Commodity [Member] | Ohio Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		0			0			0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					0			0
Commodity [Member] | Public Service Co Of Oklahoma [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		0			0			0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					0			0
Commodity [Member] | Southwestern Electric Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		0			0			0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					0			0
Commodity [Member] | Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	390,000			390,000			392,000
Long-term Risk Management Assets	[9]	451,000			451,000			367,000
Total Assets	[9]	841,000			841,000			759,000
Current Risk Management Liabilities	[9]	311,000			311,000			329,000
Long-term Risk Management Liabilities	[9]	258,000			258,000			208,000
Total Liabilities	[9]	569,000			569,000			537,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	272,000			272,000			222,000
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	52,015			52,015			32,903
Long-term Risk Management Assets	[10]	3,286			3,286			5,159
Total Assets	[10]	55,301			55,301			38,062
Current Risk Management Liabilities	[10]	23,210			23,210			20,161
Long-term Risk Management Liabilities	[10]	1,734			1,734			2,322
Total Liabilities	[10]	24,944			24,944			22,483
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	30,357			30,357			15,579
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	26,147			26,147			28,545
Long-term Risk Management Assets	[10]	2,219			2,219			3,499
Total Assets	[10]	28,366			28,366			32,044
Current Risk Management Liabilities	[10]	14,553			14,553			11,326
Long-term Risk Management Liabilities	[10]	1,176			1,176			1,575
Total Liabilities	[10]	15,729			15,729			12,901
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	12,637			12,637			19,143
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	70			70			7,242
Long-term Risk Management Assets	[10]	44,056			44,056			45,102
Total Assets	[10]	44,126			44,126			52,344
Current Risk Management Liabilities	[10]	2,201			2,201			2,045
Long-term Risk Management Liabilities	[10]	4,573			4,573			3,013
Total Liabilities	[10]	6,774			6,774			5,058
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	37,352			37,352			47,286
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	1,821			1,821			360
Long-term Risk Management Assets	[10]	29			29			0
Total Assets	[10]	1,850			1,850			360
Current Risk Management Liabilities	[10]	334			334			1,332
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	334			334			1,332
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	1,516			1,516			(972)
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	2,183			2,183			471
Long-term Risk Management Assets	[10]	33			33			0
Total Assets	[10]	2,216			2,216			471
Current Risk Management Liabilities	[10]	2,763			2,763			1,584
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	2,763			2,763			1,584
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	(547)			(547)			(1,113)
Commodity [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	22,000			22,000			30,000
Long-term Risk Management Assets	[9]	4,000			4,000			3,000
Total Assets	[9]	26,000			26,000			33,000
Current Risk Management Liabilities	[9]	18,000			18,000			23,000
Long-term Risk Management Liabilities	[9]	17,000			17,000			8,000
Total Liabilities	[9]	35,000			35,000			31,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	(9,000)			(9,000)			2,000
Commodity [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Commodity [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Commodity [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Commodity [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Commodity [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Interest Rate and Foreign Currency [Member]
Commodity:
Derivative, Notional Amount		564,000			564,000			815,000
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[1]	0			0			0
Hedging Liabilities	[1]	1,000			1,000			1,000
AOCI Gain (Loss) Net of Tax		(18,000)			(18,000)			(19,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					(1,000)			(2,000)
Interest Rate and Foreign Currency [Member] | Appalachian Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		4,027			4,027			3,896
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					773			275
Interest Rate and Foreign Currency [Member] | Indiana Michigan Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		(13,871)			(13,871)			(14,406)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					(1,214)			(1,090)
Interest Rate and Foreign Currency [Member] | Ohio Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		4,916			4,916			5,602
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					1,350			1,372
Interest Rate and Foreign Currency [Member] | Public Service Co Of Oklahoma [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		4,563			4,563			4,943
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					759			759
Interest Rate and Foreign Currency [Member] | Southwestern Electric Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[8]	0			0			0
Hedging Liabilities	[8]	0			0			0
AOCI Gain (Loss) Net of Tax		(9,902)			(9,902)			(11,036)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					(1,728)			(1,998)
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	2,000			2,000			3,000
Long-term Risk Management Assets	[9]	0			0			0
Total Assets	[9]	2,000			2,000			3,000
Current Risk Management Liabilities	[9]	1,000			1,000			1,000
Long-term Risk Management Liabilities	[9]	5,000			5,000			9,000
Total Liabilities	[9]	6,000			6,000			10,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	(4,000)			(4,000)			(7,000)
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			0
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		414,000			414,000			425,000
Long-term Risk Management Assets		455,000			455,000			370,000
Total Assets		869,000			869,000			795,000
Current Risk Management Liabilities		330,000			330,000			353,000
Long-term Risk Management Liabilities		280,000			280,000			225,000
Total Liabilities		610,000			610,000			578,000
Total MTM Derivative Contract Net Assets (Liabilities)		259,000			259,000			217,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		52,015			52,015			32,903
Long-term Risk Management Assets		3,286			3,286			5,159
Total Assets		55,301			55,301			38,062
Current Risk Management Liabilities		23,210			23,210			20,161
Long-term Risk Management Liabilities		1,734			1,734			2,322
Total Liabilities		24,944			24,944			22,483
Total MTM Derivative Contract Net Assets (Liabilities)		30,357			30,357			15,579
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		26,147			26,147			28,545
Long-term Risk Management Assets		2,219			2,219			3,499
Total Assets		28,366			28,366			32,044
Current Risk Management Liabilities		14,553			14,553			11,326
Long-term Risk Management Liabilities		1,176			1,176			1,575
Total Liabilities		15,729			15,729			12,901
Total MTM Derivative Contract Net Assets (Liabilities)		12,637			12,637			19,143
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		70			70			7,242
Long-term Risk Management Assets		44,056			44,056			45,102
Total Assets		44,126			44,126			52,344
Current Risk Management Liabilities		2,201			2,201			2,045
Long-term Risk Management Liabilities		4,573			4,573			3,013
Total Liabilities		6,774			6,774			5,058
Total MTM Derivative Contract Net Assets (Liabilities)		37,352			37,352			47,286
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		1,821			1,821			360
Long-term Risk Management Assets		29			29			0
Total Assets		1,850			1,850			360
Current Risk Management Liabilities		334			334			1,332
Long-term Risk Management Liabilities		0			0			0
Total Liabilities		334			334			1,332
Total MTM Derivative Contract Net Assets (Liabilities)		1,516			1,516			(972)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		2,183			2,183			471
Long-term Risk Management Assets		33			33			0
Total Assets		2,216			2,216			471
Current Risk Management Liabilities		2,763			2,763			1,584
Long-term Risk Management Liabilities		0			0			0
Total Liabilities		2,763			2,763			1,584
Total MTM Derivative Contract Net Assets (Liabilities)		(547)			(547)			(1,113)
Gross Amounts Offset in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[11]	(242,000)			(242,000)			(247,000)
Long-term Risk Management Assets	[11]	(92,000)			(92,000)			(76,000)
Total Assets	[11]	(334,000)			(334,000)			(323,000)
Current Risk Management Liabilities	[11]	(252,000)			(252,000)			(261,000)
Long-term Risk Management Liabilities	[11]	(106,000)			(106,000)			(94,000)
Total Liabilities	[11]	(358,000)			(358,000)			(355,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	24,000			24,000			32,000
Gross Amounts Offset in the Statement of Financial Position [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[12]	(13,138)			(13,138)			(9,111)
Long-term Risk Management Assets	[12]	(284)			(284)			(268)
Total Assets	[12]	(13,422)			(13,422)			(9,379)
Current Risk Management Liabilities	[12]	(14,051)			(14,051)			(9,144)
Long-term Risk Management Liabilities	[12]	(286)			(286)			(265)
Total Liabilities	[12]	(14,337)			(14,337)			(9,409)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	915			915			30
Gross Amounts Offset in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[12]	(9,633)			(9,633)			(6,217)
Long-term Risk Management Assets	[12]	(193)			(193)			(182)
Total Assets	[12]	(9,826)			(9,826)			(6,399)
Current Risk Management Liabilities	[12]	(10,060)			(10,060)			(6,103)
Long-term Risk Management Liabilities	[12]	(194)			(194)			(180)
Total Liabilities	[12]	(10,254)			(10,254)			(6,283)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	428			428			(116)
Gross Amounts Offset in the Statement of Financial Position [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[12]	(70)			(70)			0
Long-term Risk Management Assets	[12]	0			0			0
Total Assets	[12]	(70)			(70)			0
Current Risk Management Liabilities	[12]	(191)			(191)			(102)
Long-term Risk Management Liabilities	[12]	0			0			0
Total Liabilities	[12]	(191)			(191)			(102)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	121			121			102
Gross Amounts Offset in the Statement of Financial Position [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[12]	(90)			(90)			(360)
Long-term Risk Management Assets	[12]	0			0			0
Total Assets	[12]	(90)			(90)			(360)
Current Risk Management Liabilities	[12]	(205)			(205)			(414)
Long-term Risk Management Liabilities	[12]	0			0			0
Total Liabilities	[12]	(205)			(205)			(414)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	115			115			54
Gross Amounts Offset in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[12]	(106)			(106)			(440)
Long-term Risk Management Assets	[12]	0			0			0
Total Assets	[12]	(106)			(106)			(440)
Current Risk Management Liabilities	[12]	(240)			(240)			(502)
Long-term Risk Management Liabilities	[12]	0			0			0
Total Liabilities	[12]	(240)			(240)			(502)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	134			134			62
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[13]	172,000			172,000			178,000
Long-term Risk Management Assets	[13]	363,000			363,000			294,000
Total Assets	[13]	535,000			535,000			472,000
Current Risk Management Liabilities	[13]	78,000			78,000			92,000
Long-term Risk Management Liabilities	[13]	174,000			174,000			131,000
Total Liabilities	[13]	252,000			252,000			223,000
Total MTM Derivative Contract Net Assets (Liabilities)	[13]	283,000			283,000			249,000
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[14]	38,877			38,877			23,792
Long-term Risk Management Assets	[14]	3,002			3,002			4,891
Total Assets	[14]	41,879			41,879			28,683
Current Risk Management Liabilities	[14]	9,159			9,159			11,017
Long-term Risk Management Liabilities	[14]	1,448			1,448			2,057
Total Liabilities	[14]	10,607			10,607			13,074
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	31,272			31,272			15,609
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[14]	16,514			16,514			22,328
Long-term Risk Management Assets	[14]	2,026			2,026			3,317
Total Assets	[14]	18,540			18,540			25,645
Current Risk Management Liabilities	[14]	4,493			4,493			5,223
Long-term Risk Management Liabilities	[14]	982			982			1,395
Total Liabilities	[14]	5,475			5,475			6,618
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	13,065			13,065			19,027
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[14]	0			0			7,242
Long-term Risk Management Assets	[14]	44,056			44,056			45,102
Total Assets	[14]	44,056			44,056			52,344
Current Risk Management Liabilities	[14]	2,010			2,010			1,943
Long-term Risk Management Liabilities	[14]	4,573			4,573			3,013
Total Liabilities	[14]	6,583			6,583			4,956
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	37,473			37,473			47,388
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[14]	1,731			1,731			0
Long-term Risk Management Assets	[14]	29			29			0
Total Assets	[14]	1,760			1,760			0
Current Risk Management Liabilities	[14]	129			129			918
Long-term Risk Management Liabilities	[14]	0			0			0
Total Liabilities	[14]	129			129			918
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	1,631			1,631			(918)
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[14]	2,077			2,077			31
Long-term Risk Management Assets	[14]	33			33			0
Total Assets	[14]	2,110			2,110			31
Current Risk Management Liabilities	[14]	2,523			2,523			1,082
Long-term Risk Management Liabilities	[14]	0			0			0
Total Liabilities	[14]	2,523			2,523			1,082
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	$ (413)			$ (413)			$ (1,051)
Power [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		440,000			440,000			334,000
Power [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		82,828			82,828			32,479
Power [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		38,036			38,036			23,774
Power [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		5,428			5,428			20,334
Power [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		26,530			26,530			16,765
Power [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		31,839			31,839			20,469
Coal [Member]
Commodity:
Derivative, Mass Notional Amount | T		2,000			2,000			3,000
Coal [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Mass Notional Amount | T		232			232			279
Coal [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Mass Notional Amount | T		250			250			500
Coal [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Mass Notional Amount | T		0			0			0
Coal [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Mass Notional Amount | T		0			0			0
Coal [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Mass Notional Amount | T		750			750			1,500
Natural Gas [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		73,000			73,000			106,000
Natural Gas [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		339			339			421
Natural Gas [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		227			227			286
Natural Gas [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		0			0			0
Natural Gas [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		12			12			0
Natural Gas [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		14			14			0
Heating Oil and Gasoline [Member]
Commodity:
Derivative, Volume Notional Amount | gal		8,000			8,000			6,000
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1,468			1,468			1,089
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		695			695			521
Heating Oil and Gasoline [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1,546			1,546			1,108
Heating Oil and Gasoline [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Volume Notional Amount | gal		852			852			614
Heating Oil and Gasoline [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		975			975			699
Interest Rate Contract [Member]
Commodity:
Derivative, Notional Amount		$ 129,000			$ 129,000			$ 152,000
Interest Rate Contract [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Notional Amount		3,590			3,590			5,094
Interest Rate Contract [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Notional Amount		2,435			2,435			3,455
Interest Rate Contract [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Notional Amount		0			0			0
Interest Rate Contract [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Notional Amount		0			0			0
Interest Rate Contract [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Notional Amount		0			0			$ 0
Vertically Integrated Utilities Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		1,000		4,000	7,000		22,000
Electric Generation, Transmission and Distribution Revenues [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		480		1,184	1,158		6,031
Electric Generation, Transmission and Distribution Revenues [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		619		1,323	3,241		7,479
Electric Generation, Transmission and Distribution Revenues [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		35		56	35		56
Electric Generation, Transmission and Distribution Revenues [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		35		63	24		127
Electric Generation, Transmission and Distribution Revenues [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		43		(79)	26		(56)
Sales to AEP Affiliates [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		355		0	355		0
Sales to AEP Affiliates [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		1,005		(300)	1,005		(521)
Sales to AEP Affiliates [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0	0		0
Sales to AEP Affiliates [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		300	0		521
Sales to AEP Affiliates [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0	0		0
Other Operation Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0	(2,000)		0
Other Operation Expense [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(80)			(199)
Other Operation Expense [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(58)			(158)
Other Operation Expense [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(111)			(261)
Other Operation Expense [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(76)			(198)
Other Operation Expense [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(99)			(246)
Maintenance Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0	(1,000)		0
Maintenance Expense [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(133)			(338)
Maintenance Expense [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(55)			(135)
Maintenance Expense [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(114)			(257)
Maintenance Expense [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(79)			(160)
Maintenance Expense [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(84)			(177)
Purchased Electricity for Resale [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0	4,000		0
Purchased Electricity for Resale [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		11			740
Purchased Electricity for Resale [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		38			332
Purchased Electricity for Resale [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0			0
Purchased Electricity for Resale [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0			0
Purchased Electricity for Resale [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0			0
Other Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		10,000		16,000	59,000		48,000
Regulatory Assets [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[15]	4,000		0	0		0
Regulatory Assets [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	558		0	1,275		4
Regulatory Assets [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	328		0	(232)		0
Regulatory Assets [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	0		0	0		0
Regulatory Assets [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	954		(12)	805		(10)
Regulatory Assets [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	2,111		(16)	(1,422)		(13)
Regulatory Liabilities [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[15]	49,000		29,000	53,000		118,000
Regulatory Liabilities [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	26,809		13,718	28,600		46,050
Regulatory Liabilities [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	8,415		8,793	5,839		27,110
Regulatory Liabilities [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	(7,272)		6,404	(2,599)		41,503
Regulatory Liabilities [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	6,242		(669)	5,575		(189)
Regulatory Liabilities [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[16]	9,350		$ (1,019)	13,309		$ 311
Risk Management Assets [Member] | Appalachian Power Co [Member]
Affiliated Derivative Transactions
Affiliated Transactions Related To Standard Service Offer Auctions		2,690			2,690
Risk Management Assets [Member] | Indiana Michigan Power Co [Member]
Affiliated Derivative Transactions
Affiliated Transactions Related To Standard Service Offer Auctions		3,137			3,137
Regulatory Liabilities and Deferred Investment Tax Credits [Member] | Appalachian Power Co [Member]
Affiliated Derivative Transactions
Affiliated Transactions Related To Standard Service Offer Auctions		2,690			2,690
Regulatory Liabilities and Deferred Investment Tax Credits [Member] | Indiana Michigan Power Co [Member]
Affiliated Derivative Transactions
Affiliated Transactions Related To Standard Service Offer Auctions		$ 3,137			$ 3,137

[1] Hedging Assets and Hedging Liabilities are included in Risk Management Assets and Liabilities on the condensed balance sheets.

[2] Represents the amount of collateral AEP subsidiaries would have been required to post for other significant non-derivative contracts including AGR jointly owned plant contracts and various other commodity related contracts.

[3] 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.''

[4] 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.

[5] 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.

[6] 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.”

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

[8] Hedging Assets and Hedging Liabilities are included in Risk Management Assets and Liabilities on the condensed balance sheets.

[9] Derivative instruments within these categories are reported gross. These instruments are subject to master netting agreements and are presented on the condensed balance sheets on a net basis in accordance with the accounting guidance for "Derivatives and Hedging."

[10] Derivative instruments within these categories are reported gross. These instruments are subject to master netting agreements and are presented on the condensed balance sheets on a net basis in accordance with the accounting guidance for "Derivatives and Hedging."

[11] Amounts primarily include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for "Derivatives and Hedging." Amounts also include de-designated risk management contracts.

[12] Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for "Derivatives and Hedging."

[13] There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the statement of financial position.

[14] There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the statement of financial position.

[15] Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the condensed balance sheets.

[16] Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the condensed balance sheets.