Derivatives and Hedging (Details) gal in Thousands, T in Thousands, MWh in Thousands, MMBTU in Thousands, $ in Thousands		3 Months Ended			9 Months Ended			12 Months Ended
		Sep. 30, 2015 USD ($) MWh MMBTU T gal		Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) MWh MMBTU T gal		Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) MWh MMBTU T gal
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		$ 4,000			$ 4,000			$ 4,000
Cash Collateral Paid Netted Against Risk Management Liabilities		47,000			47,000			35,000
Fair Value of Derivative Instruments
Current Risk Management Assets		143,000			143,000			178,000
Long-term Risk Management Assets		353,000			353,000			294,000
Total Assets		496,000			496,000			472,000
Current Risk Management Liabilities		75,000			75,000			92,000
Long-term Risk Management Liabilities		201,000			201,000			131,000
Total Liabilities		276,000			276,000			223,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(20,000)		$ 15,000	100,000		$ 203,000
Gain (Loss) on Hedging Instruments
Gain (Loss) on Fair Value Hedging Instruments		4,000		(2,000)	7,000		2,000
Gain (Loss) on Fair Value Portion of Long Term Debt		(4,000)		2,000	(7,000)		(2,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[1]	7,000			7,000			16,000
Hedging Liabilities	[1]	25,000			25,000			15,000
AOCI Gain (Loss) Net of Tax		(29,000)			(29,000)			(18,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					$ 0			2,000
Maximum Term for Exposure to Variability of Future Cash Flows					87 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		35,000			35,000			36,000
Amount of Collateral Attributable to Other Contracts	[2]	299,000			299,000			281,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		307,000			307,000			235,000
Amount of Cash Collateral Posted		10,000			10,000			9,000
Additional Settlement Liability if Cross Default Provision is Triggered		251,000			251,000			178,000
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets		4,000			4,000			4,000
Cash Collateral Paid Netted Against Risk Management Liabilities		47,000			$ 47,000			35,000
Maximum Term for Exposure to Variability of Future Cash Flows					87 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		1,688			1,688			98
Fair Value of Derivative Instruments
Current Risk Management Assets		25,970			25,970			23,792
Long-term Risk Management Assets		2,035			2,035			4,891
Current Risk Management Liabilities		6,902			6,902			11,017
Long-term Risk Management Liabilities		973			973			2,057
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		5,424		(4,946)	$ 37,015		47,139
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows					0 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		2,913			2,913			6,339
Amount of Collateral Attributable to Other Contracts		97			97			74
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		5,310			5,310			9,043
Amount of Cash Collateral Posted		0			0			0
Additional Settlement Liability if Cross Default Provision is Triggered		5,288			5,288			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		1,688			$ 1,688			98
Maximum Term for Exposure to Variability of Future Cash Flows					0 months
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		333			333			47
Fair Value of Derivative Instruments
Current Risk Management Assets		8,574			8,574			22,328
Long-term Risk Management Assets		1,338			1,338			3,317
Current Risk Management Liabilities		4,615			4,615			5,223
Long-term Risk Management Liabilities		1,248			1,248			1,395
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		853		2,145	$ 10,745		36,213
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows					0 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		1,976			1,976			4,299
Amount of Collateral Attributable to Other Contracts		66			66			47
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements		3,601			3,601			6,134
Amount of Cash Collateral Posted		0			0			0
Additional Settlement Liability if Cross Default Provision is Triggered		3,586			3,586			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		333			$ 333			47
Maximum Term for Exposure to Variability of Future Cash Flows					0 months
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		500			500			102
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			7,242
Long-term Risk Management Assets		23,265			23,265			45,102
Current Risk Management Liabilities		2,823			2,823			1,943
Long-term Risk Management Liabilities		4,871			4,871			3,013
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(23,436)		(2,366)	$ (26,517)		39,193
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows					0 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		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		500			$ 500			102
Maximum Term for Exposure to Variability of Future Cash Flows					0 months
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		280			280			54
Fair Value of Derivative Instruments
Current Risk Management Assets		1,035			1,035			0
Current Risk Management Liabilities		70			70			918
Long-term Risk Management Liabilities		8			8			0
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(894)		252	$ 5,152		701
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows					0 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		2,692			2,692			693
Amount of Collateral Attributable to Other Contracts		3,247			3,247			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		280			$ 280			54
Maximum Term for Exposure to Variability of Future Cash Flows					0 months
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		319			319			62
Fair Value of Derivative Instruments
Current Risk Management Assets		1,280			1,280			31
Current Risk Management Liabilities		1,302			1,302			1,082
Long-term Risk Management Liabilities		757			757			0
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		1,103		(390)	$ 12,593		(148)
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Maximum Term for Exposure to Variability of Future Cash Flows					0 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		3,328			3,328			877
Amount of Collateral Attributable to Other Contracts		58			58			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		319			$ 319			62
Maximum Term for Exposure to Variability of Future Cash Flows					0 months
Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Total Assets	[3]	487,000	[4]		$ 487,000	[4]		453,000	[5]
Total Liabilities	[3]	250,000	[4]		250,000	[4]		199,000	[5]
Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	29,385			29,385			28,683
Total Liabilities	[6],[7]	7,875			7,875			13,074
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	11,965			11,965			25,645
Total Liabilities	[6],[7]	5,863			5,863			6,618
Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	23,265			23,265			52,344
Total Liabilities	[6],[7]	7,694			7,694			4,956
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	1,035			1,035			0
Total Liabilities	[6],[7]	78			78			918
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[6],[7]	1,280			1,280			31
Total Liabilities	[6],[7]	2,059			2,059			1,082
Commodity [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	[1]	7,000			7,000			16,000
Hedging Liabilities	[1]	24,000			24,000			14,000
AOCI Gain (Loss) Net of Tax		(11,000)			(11,000)			1,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					1,000			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]	311,000			311,000			392,000
Long-term Risk Management Assets	[9]	443,000			443,000			367,000
Total Assets	[9]	754,000			754,000			759,000
Current Risk Management Liabilities	[9]	267,000			267,000			329,000
Long-term Risk Management Liabilities	[9]	293,000			293,000			208,000
Total Liabilities	[9]	560,000			560,000			537,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	194,000			194,000			222,000
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	34,278			34,278			32,903
Long-term Risk Management Assets	[10]	2,485			2,485			5,159
Total Assets	[10]	36,763			36,763			38,062
Current Risk Management Liabilities	[10]	15,345			15,345			20,161
Long-term Risk Management Liabilities	[10]	1,596			1,596			2,322
Total Liabilities	[10]	16,941			16,941			22,483
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	19,822			19,822			15,579
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	16,675			16,675			28,545
Long-term Risk Management Assets	[10]	1,619			1,619			3,499
Total Assets	[10]	18,294			18,294			32,044
Current Risk Management Liabilities	[10]	10,901			10,901			11,326
Long-term Risk Management Liabilities	[10]	1,624			1,624			1,575
Total Liabilities	[10]	12,525			12,525			12,901
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	5,769			5,769			19,143
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	0			0			7,242
Long-term Risk Management Assets	[10]	23,265			23,265			45,102
Total Assets	[10]	23,265			23,265			52,344
Current Risk Management Liabilities	[10]	3,271			3,271			2,045
Long-term Risk Management Liabilities	[10]	4,923			4,923			3,013
Total Liabilities	[10]	8,194			8,194			5,058
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	15,071			15,071			47,286
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	1,166			1,166			360
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	1,166			1,166			360
Current Risk Management Liabilities	[10]	454			454			1,332
Long-term Risk Management Liabilities	[10]	35			35			0
Total Liabilities	[10]	489			489			1,332
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	677			677			(972)
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	1,442			1,442			471
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	1,442			1,442			471
Current Risk Management Liabilities	[10]	1,752			1,752			1,584
Long-term Risk Management Liabilities	[10]	788			788			0
Total Liabilities	[10]	2,540			2,540			1,584
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	(1,098)			(1,098)			(1,113)
Commodity [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	9,000			9,000			30,000
Long-term Risk Management Assets	[9]	3,000			3,000			3,000
Total Assets	[9]	12,000			12,000			33,000
Current Risk Management Liabilities	[9]	7,000			7,000			23,000
Long-term Risk Management Liabilities	[9]	22,000			22,000			8,000
Total Liabilities	[9]	29,000			29,000			31,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	(17,000)			(17,000)			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		560,000			560,000			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		3,805			3,805			3,896
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					734			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		(13,604)			(13,604)			(14,406)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					(1,277)			(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		4,572			4,572			5,602
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					1,282			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		4,374			4,374			4,943
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					771			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		(9,470)			(9,470)			(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]	1,000			1,000			9,000
Total Liabilities	[9]	2,000			2,000			10,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	0			0			(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		322,000			322,000			425,000
Long-term Risk Management Assets		446,000			446,000			370,000
Total Assets		768,000			768,000			795,000
Current Risk Management Liabilities		275,000			275,000			353,000
Long-term Risk Management Liabilities		316,000			316,000			225,000
Total Liabilities		591,000			591,000			578,000
Total MTM Derivative Contract Net Assets (Liabilities)		177,000			177,000			217,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		34,278			34,278			32,903
Long-term Risk Management Assets		2,485			2,485			5,159
Total Assets		36,763			36,763			38,062
Current Risk Management Liabilities		15,345			15,345			20,161
Long-term Risk Management Liabilities		1,596			1,596			2,322
Total Liabilities		16,941			16,941			22,483
Total MTM Derivative Contract Net Assets (Liabilities)		19,822			19,822			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		16,675			16,675			28,545
Long-term Risk Management Assets		1,619			1,619			3,499
Total Assets		18,294			18,294			32,044
Current Risk Management Liabilities		10,901			10,901			11,326
Long-term Risk Management Liabilities		1,624			1,624			1,575
Total Liabilities		12,525			12,525			12,901
Total MTM Derivative Contract Net Assets (Liabilities)		5,769			5,769			19,143
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			7,242
Long-term Risk Management Assets		23,265			23,265			45,102
Total Assets		23,265			23,265			52,344
Current Risk Management Liabilities		3,271			3,271			2,045
Long-term Risk Management Liabilities		4,923			4,923			3,013
Total Liabilities		8,194			8,194			5,058
Total MTM Derivative Contract Net Assets (Liabilities)		15,071			15,071			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		1,166			1,166			360
Long-term Risk Management Assets		0			0			0
Total Assets		1,166			1,166			360
Current Risk Management Liabilities		454			454			1,332
Long-term Risk Management Liabilities		35			35			0
Total Liabilities		489			489			1,332
Total MTM Derivative Contract Net Assets (Liabilities)		677			677			(972)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		1,442			1,442			471
Long-term Risk Management Assets		0			0			0
Total Assets		1,442			1,442			471
Current Risk Management Liabilities		1,752			1,752			1,584
Long-term Risk Management Liabilities		788			788			0
Total Liabilities		2,540			2,540			1,584
Total MTM Derivative Contract Net Assets (Liabilities)		(1,098)			(1,098)			(1,113)
Gross Amounts Offset in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[11]	(179,000)			(179,000)			(247,000)
Long-term Risk Management Assets	[11]	(93,000)			(93,000)			(76,000)
Total Assets	[11]	(272,000)			(272,000)			(323,000)
Current Risk Management Liabilities	[11]	(200,000)			(200,000)			(261,000)
Long-term Risk Management Liabilities	[11]	(115,000)			(115,000)			(94,000)
Total Liabilities	[11]	(315,000)			(315,000)			(355,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	43,000			43,000			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]	(6,928)			(6,928)			(9,111)
Long-term Risk Management Assets	[12]	(450)			(450)			(268)
Total Assets	[12]	(7,378)			(7,378)			(9,379)
Current Risk Management Liabilities	[12]	(8,443)			(8,443)			(9,144)
Long-term Risk Management Liabilities	[12]	(623)			(623)			(265)
Total Liabilities	[12]	(9,066)			(9,066)			(9,409)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	1,688			1,688			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]	(6,048)			(6,048)			(6,217)
Long-term Risk Management Assets	[12]	(281)			(281)			(182)
Total Assets	[12]	(6,329)			(6,329)			(6,399)
Current Risk Management Liabilities	[12]	(6,286)			(6,286)			(6,103)
Long-term Risk Management Liabilities	[12]	(376)			(376)			(180)
Total Liabilities	[12]	(6,662)			(6,662)			(6,283)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	333			333			(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]	0			0			0
Long-term Risk Management Assets	[12]	0			0			0
Total Assets	[12]	0			0			0
Current Risk Management Liabilities	[12]	(448)			(448)			(102)
Long-term Risk Management Liabilities	[12]	(52)			(52)			0
Total Liabilities	[12]	(500)			(500)			(102)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	500			500			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]	(131)			(131)			(360)
Long-term Risk Management Assets	[12]	0			0			0
Total Assets	[12]	(131)			(131)			(360)
Current Risk Management Liabilities	[12]	(384)			(384)			(414)
Long-term Risk Management Liabilities	[12]	(27)			(27)			0
Total Liabilities	[12]	(411)			(411)			(414)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	280			280			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]	(162)			(162)			(440)
Long-term Risk Management Assets	[12]	0			0			0
Total Assets	[12]	(162)			(162)			(440)
Current Risk Management Liabilities	[12]	(450)			(450)			(502)
Long-term Risk Management Liabilities	[12]	(31)			(31)			0
Total Liabilities	[12]	(481)			(481)			(502)
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	319			319			62
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[13]	143,000			143,000			178,000
Long-term Risk Management Assets	[13]	353,000			353,000			294,000
Total Assets	[13]	496,000			496,000			472,000
Current Risk Management Liabilities	[13]	75,000			75,000			92,000
Long-term Risk Management Liabilities	[13]	201,000			201,000			131,000
Total Liabilities	[13]	276,000			276,000			223,000
Total MTM Derivative Contract Net Assets (Liabilities)	[13]	220,000			220,000			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]	27,350			27,350			23,792
Long-term Risk Management Assets	[14]	2,035			2,035			4,891
Total Assets	[14]	29,385			29,385			28,683
Current Risk Management Liabilities	[14]	6,902			6,902			11,017
Long-term Risk Management Liabilities	[14]	973			973			2,057
Total Liabilities	[14]	7,875			7,875			13,074
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	21,510			21,510			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]	10,627			10,627			22,328
Long-term Risk Management Assets	[14]	1,338			1,338			3,317
Total Assets	[14]	11,965			11,965			25,645
Current Risk Management Liabilities	[14]	4,615			4,615			5,223
Long-term Risk Management Liabilities	[14]	1,248			1,248			1,395
Total Liabilities	[14]	5,863			5,863			6,618
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	6,102			6,102			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]	23,265			23,265			45,102
Total Assets	[14]	23,265			23,265			52,344
Current Risk Management Liabilities	[14]	2,823			2,823			1,943
Long-term Risk Management Liabilities	[14]	4,871			4,871			3,013
Total Liabilities	[14]	7,694			7,694			4,956
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	15,571			15,571			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]	1,035			1,035			0
Long-term Risk Management Assets	[14]	0			0			0
Total Assets	[14]	1,035			1,035			0
Current Risk Management Liabilities	[14]	70			70			918
Long-term Risk Management Liabilities	[14]	8			8			0
Total Liabilities	[14]	78			78			918
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	957			957			(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]	1,280			1,280			31
Long-term Risk Management Assets	[14]	0			0			0
Total Assets	[14]	1,280			1,280			31
Current Risk Management Liabilities	[14]	1,302			1,302			1,082
Long-term Risk Management Liabilities	[14]	757			757			0
Total Liabilities	[14]	2,059			2,059			1,082
Total MTM Derivative Contract Net Assets (Liabilities)	[14]	$ (779)			$ (779)			$ (1,051)
Power [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		371,000			371,000			334,000
Power [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		62,306			62,306			32,479
Power [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		30,345			30,345			23,774
Power [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		13,470			13,470			20,334
Power [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		17,580			17,580			16,765
Power [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		21,736			21,736			20,469
Coal [Member]
Commodity:
Derivative, Mass Notional Amount | T		4,000			4,000			3,000
Coal [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Mass Notional Amount | T		116			116			279
Coal [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Mass Notional Amount | T		1,468			1,468			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		2,125			2,125			1,500
Natural Gas [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		46,000			46,000			106,000
Natural Gas [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		256			256			421
Natural Gas [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		174			174			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		0			0			0
Natural Gas [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		0			0			0
Heating Oil and Gasoline [Member]
Commodity:
Derivative, Volume Notional Amount | gal		9,000			9,000			6,000
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1,763			1,763			1,089
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		836			836			521
Heating Oil and Gasoline [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1,858			1,858			1,108
Heating Oil and Gasoline [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1,019			1,019			614
Heating Oil and Gasoline [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1,166			1,166			699
Interest Rate Contract [Member]
Commodity:
Derivative, Notional Amount		$ 114,000			$ 114,000			$ 152,000
Interest Rate Contract [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Notional Amount		2,645			2,645			5,094
Interest Rate Contract [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Notional Amount		1,794			1,794			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		0		7,000	7,000		29,000
Transmission and Distribution Utilities Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(1,000)		0	(1,000)		0
Generation & Marketing Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		1,000		21,000	60,000		69,000
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		(369)		1,231	790		7,262
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		350		2,988	3,591		10,467
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		(917)		41	(882)		97
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		(9)		45	16		172
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		(7)		74	19		18
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		1,156		0	1,511		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		3,336		(196)	4,341		(717)
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		196	0		717
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	(1,000)		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		(88)			(287)
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		(63)			(221)
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		(128)			(389)
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		(109)			(307)
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		(127)			(373)
Maintenance Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(1,000)		0	(2,000)		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		(164)			(503)
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		(86)			(221)
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		(140)			(396)
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		(88)			(248)
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		(88)			(265)
Purchased Electricity for Resale [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		1,000		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		831			1,571
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		15			347
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		30			30
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
Regulatory Assets [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[15]	0		(6,000)	0		(6,000)
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]	861		(2,571)	2,136		(2,567)
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]	(981)		(471)	(1,213)		(471)
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		(852)	0		(215)
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]	(190)		(109)	615		(119)
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]	188		(284)	(1,234)		(285)
Regulatory Liabilities [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[15]	(20,000)		(7,000)	33,000		111,000
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]	3,197		(3,606)	31,797		42,444
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]	(1,718)		(176)	4,121		26,934
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]	(22,281)		(1,555)	(24,880)		39,311
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]	(498)		120	5,076		(69)
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]	$ 1,137		$ (180)	$ 14,446		$ 119

[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 September 30, 2015 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures ($4) million in 2015 and ($12) million in periods 2016-2018; Level 2 matures $5 million in 2015, $28 million in periods 2016-2018, $3 million in periods 2019-2020 and $2 million in periods 2021-2032; Level 3 matures $2 million in 2015, $63 million in periods 2016-2018, $25 million in periods 2019-2020 and $82 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."

[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.