Derivatives and Hedging (Details) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets	$ 4,000,000				$ 4,000,000
Cash Collateral Paid Netted Against Risk Management Liabilities	37,000,000				35,000,000
Fair Value of Derivative Instruments
Current Risk Management Assets	138,000,000				178,000,000
Long-term Risk Management Assets	365,000,000				294,000,000
Total Assets	503,000,000				472,000,000
Current Risk Management Liabilities	83,000,000				92,000,000
Long-term Risk Management Liabilities	156,000,000				131,000,000
Total Liabilities	239,000,000				223,000,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	55,000,000		139,000,000
Gain (Loss) on Hedging Instruments
Gain (Loss) on Fair Value Hedging Instruments	5,000,000		2,000,000
Gain (Loss) on Fair Value Portion of Long-term Debt	(5,000,000)		(2,000,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	4,000,000	[1]			16,000,000	[1]
Hedging Liabilities	13,000,000	[1]			15,000,000	[1]
AOCI Gain (Loss) Net of Tax	(24,000,000)				(18,000,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	(8,000,000)				2,000,000
Maximum Term for Exposure to Variability of Future Cash Flows	69 months
Collateral Triggering Events [Abstract]
Fair Value of Contracts Contracts with Credit Downgrade Triggers	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
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs	29,000,000				36,000,000
Amount Attributable to Other Contracts	300,000,000	[2]			281,000,000	[2]
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements	271,000,000				235,000,000
Amount of Cash Collateral Posted	8,000,000				9,000,000
Additional Settlement Liability if Cross Default Provision is Triggered	203,000,000				178,000,000
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets	4,000,000				4,000,000
Cash Collateral Paid Netted Against Risk Management Liabilities	37,000,000				35,000,000
Maximum Term for Exposure to Variability of Future Cash Flows	69 months
Appalachian Power Co [Member]
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets	153,000				68,000
Cash Collateral Paid Netted Against Risk Management Liabilities	830,000				98,000
Fair Value of Derivative Instruments
Current Risk Management Assets	12,384,000				23,792,000
Long-term Risk Management Assets	4,157,000				4,891,000
Current Risk Management Liabilities	8,661,000				11,017,000
Long-term Risk Management Liabilities	2,033,000				2,057,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	3,433,000		37,183,000
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 Contracts with Credit Downgrade Triggers	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
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs	4,547,000				6,339,000
Amount Attributable to Other Contracts	83,000				74,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements	8,051,000				9,043,000
Amount of Cash Collateral Posted	0				0
Additional Settlement Liability if Cross Default Provision is Triggered	7,921,000				9,012,000
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets	153,000				68,000
Cash Collateral Paid Netted Against Risk Management Liabilities	830,000				98,000
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	89,000				163,000
Cash Collateral Paid Netted Against Risk Management Liabilities	404,000				47,000
Fair Value of Derivative Instruments
Current Risk Management Assets	9,954,000				22,328,000
Long-term Risk Management Assets	2,820,000				3,317,000
Current Risk Management Liabilities	4,808,000				5,223,000
Long-term Risk Management Liabilities	1,378,000				1,395,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	(1,198,000)		24,252,000
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 Contracts with Credit Downgrade Triggers	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
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs	3,084,000				4,299,000
Amount Attributable to Other Contracts	53,000				47,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements	5,461,000				6,134,000
Amount of Cash Collateral Posted	0				0
Additional Settlement Liability if Cross Default Provision is Triggered	5,373,000				6,113,000
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets	89,000				163,000
Cash Collateral Paid Netted Against Risk Management Liabilities	404,000				47,000
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
Cash Collateral Paid Netted Against Risk Management Liabilities	804,000				102,000
Fair Value of Derivative Instruments
Current Risk Management Assets	1,272,000				7,242,000
Long-term Risk Management Assets	50,422,000				45,102,000
Current Risk Management Liabilities	1,491,000				1,943,000
Long-term Risk Management Liabilities	4,292,000				3,013,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	4,380,000		35,099,000
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 Contracts with Credit Downgrade Triggers	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
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs	0				0
Amount Attributable to Other Contracts	0				0
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements	0				0
Amount of Cash Collateral Posted	0				0
Additional Settlement Liability if Cross Default Provision is Triggered	0				0
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets	0				0
Cash Collateral Paid Netted Against Risk Management Liabilities	804,000				102,000
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	6,000				0
Cash Collateral Paid Netted Against Risk Management Liabilities	435,000				54,000
Fair Value of Derivative Instruments
Current Risk Management Assets	9,000				0
Current Risk Management Liabilities	702,000				918,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	(1,030,000)		767,000
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 Contracts with Credit Downgrade Triggers	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
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs	0				693,000
Amount Attributable to Other Contracts	4,108,000				4,111,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements	0				0
Amount of Cash Collateral Posted	0				0
Additional Settlement Liability if Cross Default Provision is Triggered	0				0
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets	6,000				0
Cash Collateral Paid Netted Against Risk Management Liabilities	435,000				54,000
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	8,000				0
Cash Collateral Paid Netted Against Risk Management Liabilities	499,000				62,000
Fair Value of Derivative Instruments
Current Risk Management Assets	11,000				31,000
Current Risk Management Liabilities	4,197,000				1,082,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	169,000		1,356,000
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 Contracts with Credit Downgrade Triggers	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
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs	0				877,000
Amount Attributable to Other Contracts	162,000				166,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements	0				0
Amount of Cash Collateral Posted	0				0
Additional Settlement Liability if Cross Default Provision is Triggered	0				0
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets	8,000				0
Cash Collateral Paid Netted Against Risk Management Liabilities	499,000				62,000
Maximum Term for Exposure to Variability of Future Cash Flows	0 months
Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Total Assets	496,000,000	[3],[4]			453,000,000	[3],[5]
Total Liabilities	221,000,000	[3],[4]			199,000,000	[3],[5]
Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	16,541,000	[6],[7]			28,683,000	[6],[7]
Total Liabilities	10,694,000	[6],[7]			13,074,000	[6],[7]
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	12,774,000	[6],[7]			25,645,000	[6],[7]
Total Liabilities	6,186,000	[6],[7]			6,618,000	[6],[7]
Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	51,694,000	[6],[7]			52,344,000	[6],[7]
Total Liabilities	5,783,000	[6],[7]			4,956,000	[6],[7]
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Total Assets	9,000	[6],[7]			0	[6],[7]
Total Liabilities	702,000	[6],[7]			918,000	[6],[7]
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	11,000	[6],[7]			31,000	[6],[7]
Total Liabilities	4,197,000	[6],[7]			1,082,000	[6],[7]
Commodity [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	4,000,000	[1]			16,000,000	[1]
Hedging Liabilities	12,000,000	[1]			14,000,000	[1]
AOCI Gain (Loss) Net of Tax	(6,000,000)				1,000,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	(6,000,000)				4,000,000
Derivatives and Hedging (Textuals) [Abstract]
Cross Default Provisions Maximum Third Party Obligation Amount	50,000,000				50,000,000
Commodity [Member] | Appalachian Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	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	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	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	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	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	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	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	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	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	342,000,000	[8]			392,000,000	[8]
Long-term Risk Management Assets	453,000,000	[8]			367,000,000	[8]
Total Assets	795,000,000	[8]			759,000,000	[8]
Current Risk Management Liabilities	302,000,000	[8]			329,000,000	[8]
Long-term Risk Management Liabilities	250,000,000	[8]			208,000,000	[8]
Total Liabilities	552,000,000	[8]			537,000,000	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	243,000,000	[8]			222,000,000	[8]
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	19,733,000	[8]			32,903,000	[8]
Long-term Risk Management Assets	4,747,000	[8]			5,159,000	[8]
Total Assets	24,480,000	[8]			38,062,000	[8]
Current Risk Management Liabilities	16,627,000	[8]			20,161,000	[8]
Long-term Risk Management Liabilities	2,683,000	[8]			2,322,000	[8]
Total Liabilities	19,310,000	[8]			22,483,000	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	5,170,000	[8]			15,579,000	[8]
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	14,701,000	[8]			28,545,000	[8]
Long-term Risk Management Assets	3,210,000	[8]			3,499,000	[8]
Total Assets	17,911,000	[8]			32,044,000	[8]
Current Risk Management Liabilities	9,835,000	[8]			11,326,000	[8]
Long-term Risk Management Liabilities	1,803,000	[8]			1,575,000	[8]
Total Liabilities	11,638,000	[8]			12,901,000	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	6,273,000	[8]			19,143,000	[8]
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	1,303,000	[8]			7,242,000	[8]
Long-term Risk Management Assets	50,422,000	[8]			45,102,000	[8]
Total Assets	51,725,000	[8]			52,344,000	[8]
Current Risk Management Liabilities	2,326,000	[8]			2,045,000	[8]
Long-term Risk Management Liabilities	4,292,000	[8]			3,013,000	[8]
Total Liabilities	6,618,000	[8]			5,058,000	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	45,107,000	[8]			47,286,000	[8]
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	150,000	[8]			360,000	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	150,000	[8]			360,000	[8]
Current Risk Management Liabilities	1,272,000	[8]			1,332,000	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	1,272,000	[8]			1,332,000	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	(1,122,000)	[8]			(972,000)	[8]
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	185,000	[8]			471,000	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	185,000	[8]			471,000	[8]
Current Risk Management Liabilities	4,862,000	[8]			1,584,000	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	4,862,000	[8]			1,584,000	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	(4,677,000)	[8]			(1,113,000)	[8]
Commodity [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	10,000,000	[8]			30,000,000	[8]
Long-term Risk Management Assets	4,000,000	[8]			3,000,000	[8]
Total Assets	14,000,000	[8]			33,000,000	[8]
Current Risk Management Liabilities	12,000,000	[8]			23,000,000	[8]
Long-term Risk Management Liabilities	10,000,000	[8]			8,000,000	[8]
Total Liabilities	22,000,000	[8]			31,000,000	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	(8,000,000)	[8]			2,000,000	[8]
Commodity [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Commodity [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Commodity [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Commodity [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Commodity [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Interest Rate and Foreign Currency [Member]
Commodity:
Derivative, Notional Amount	814,000,000				815,000,000
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	0	[1]			0	[1]
Hedging Liabilities	1,000,000	[1]			1,000,000	[1]
AOCI Gain (Loss) Net of Tax	(18,000,000)				(19,000,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	(2,000,000)				(2,000,000)
Interest Rate and Foreign Currency [Member] | Appalachian Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	4,025,000				3,896,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	587,000				275,000
Interest Rate and Foreign Currency [Member] | Indiana Michigan Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	(14,139,000)				(14,406,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	(1,152,000)				(1,090,000)
Interest Rate and Foreign Currency [Member] | Ohio Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	5,259,000				5,602,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	1,372,000				1,372,000
Interest Rate and Foreign Currency [Member] | Public Service Co Of Oklahoma [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	4,753,000				4,943,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	759,000				759,000
Interest Rate and Foreign Currency [Member] | Southwestern Electric Power Co [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	0	[1]			0	[1]
Hedging Liabilities	0	[1]			0	[1]
AOCI Gain (Loss) Net of Tax	(10,469,000)				(11,036,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	(1,863,000)				(1,998,000)
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	3,000,000	[8]			3,000,000	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	3,000,000	[8]			3,000,000	[8]
Current Risk Management Liabilities	1,000,000	[8]			1,000,000	[8]
Long-term Risk Management Liabilities	5,000,000	[8]			9,000,000	[8]
Total Liabilities	6,000,000	[8]			10,000,000	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	(3,000,000)	[8]			(7,000,000)	[8]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	0	[8]			0	[8]
Long-term Risk Management Assets	0	[8]			0	[8]
Total Assets	0	[8]			0	[8]
Current Risk Management Liabilities	0	[8]			0	[8]
Long-term Risk Management Liabilities	0	[8]			0	[8]
Total Liabilities	0	[8]			0	[8]
Total MTM Derivative Contract Net Assets (Liabilities)	0	[8]			0	[8]
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	355,000,000				425,000,000
Long-term Risk Management Assets	457,000,000				370,000,000
Total Assets	812,000,000				795,000,000
Current Risk Management Liabilities	315,000,000				353,000,000
Long-term Risk Management Liabilities	265,000,000				225,000,000
Total Liabilities	580,000,000				578,000,000
Total MTM Derivative Contract Net Assets (Liabilities)	232,000,000				217,000,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	19,733,000				32,903,000
Long-term Risk Management Assets	4,747,000				5,159,000
Total Assets	24,480,000				38,062,000
Current Risk Management Liabilities	16,627,000				20,161,000
Long-term Risk Management Liabilities	2,683,000				2,322,000
Total Liabilities	19,310,000				22,483,000
Total MTM Derivative Contract Net Assets (Liabilities)	5,170,000				15,579,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	14,701,000				28,545,000
Long-term Risk Management Assets	3,210,000				3,499,000
Total Assets	17,911,000				32,044,000
Current Risk Management Liabilities	9,835,000				11,326,000
Long-term Risk Management Liabilities	1,803,000				1,575,000
Total Liabilities	11,638,000				12,901,000
Total MTM Derivative Contract Net Assets (Liabilities)	6,273,000				19,143,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	1,303,000				7,242,000
Long-term Risk Management Assets	50,422,000				45,102,000
Total Assets	51,725,000				52,344,000
Current Risk Management Liabilities	2,326,000				2,045,000
Long-term Risk Management Liabilities	4,292,000				3,013,000
Total Liabilities	6,618,000				5,058,000
Total MTM Derivative Contract Net Assets (Liabilities)	45,107,000				47,286,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	150,000				360,000
Long-term Risk Management Assets	0				0
Total Assets	150,000				360,000
Current Risk Management Liabilities	1,272,000				1,332,000
Long-term Risk Management Liabilities	0				0
Total Liabilities	1,272,000				1,332,000
Total MTM Derivative Contract Net Assets (Liabilities)	(1,122,000)				(972,000)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	185,000				471,000
Long-term Risk Management Assets	0				0
Total Assets	185,000				471,000
Current Risk Management Liabilities	4,862,000				1,584,000
Long-term Risk Management Liabilities	0				0
Total Liabilities	4,862,000				1,584,000
Total MTM Derivative Contract Net Assets (Liabilities)	(4,677,000)				(1,113,000)
Gross Amounts Offset in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	(217,000,000)	[9]			(247,000,000)	[9]
Long-term Risk Management Assets	(92,000,000)	[9]			(76,000,000)	[9]
Total Assets	(309,000,000)	[9]			(323,000,000)	[9]
Current Risk Management Liabilities	(232,000,000)	[9]			(261,000,000)	[9]
Long-term Risk Management Liabilities	(109,000,000)	[9]			(94,000,000)	[9]
Total Liabilities	(341,000,000)	[9]			(355,000,000)	[9]
Total MTM Derivative Contract Net Assets (Liabilities)	32,000,000	[9]			32,000,000	[9]
Gross Amounts Offset in the Statement of Financial Position [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	(7,349,000)	[10]			(9,111,000)	[10]
Long-term Risk Management Assets	(590,000)	[10]			(268,000)	[10]
Total Assets	(7,939,000)	[10]			(9,379,000)	[10]
Current Risk Management Liabilities	(7,966,000)	[10]			(9,144,000)	[10]
Long-term Risk Management Liabilities	(650,000)	[10]			(265,000)	[10]
Total Liabilities	(8,616,000)	[10]			(9,409,000)	[10]
Total MTM Derivative Contract Net Assets (Liabilities)	677,000	[10]			30,000	[10]
Gross Amounts Offset in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	(4,747,000)	[10]			(6,217,000)	[10]
Long-term Risk Management Assets	(390,000)	[10]			(182,000)	[10]
Total Assets	(5,137,000)	[10]			(6,399,000)	[10]
Current Risk Management Liabilities	(5,027,000)	[10]			(6,103,000)	[10]
Long-term Risk Management Liabilities	(425,000)	[10]			(180,000)	[10]
Total Liabilities	(5,452,000)	[10]			(6,283,000)	[10]
Total MTM Derivative Contract Net Assets (Liabilities)	315,000	[10]			(116,000)	[10]
Gross Amounts Offset in the Statement of Financial Position [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	(31,000)	[10]			0	[10]
Long-term Risk Management Assets	0	[10]			0	[10]
Total Assets	(31,000)	[10]			0	[10]
Current Risk Management Liabilities	(835,000)	[10]			(102,000)	[10]
Long-term Risk Management Liabilities	0	[10]			0	[10]
Total Liabilities	(835,000)	[10]			(102,000)	[10]
Total MTM Derivative Contract Net Assets (Liabilities)	804,000	[10]			102,000	[10]
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	(141,000)	[10]			(360,000)	[10]
Long-term Risk Management Assets	0	[10]			0	[10]
Total Assets	(141,000)	[10]			(360,000)	[10]
Current Risk Management Liabilities	(570,000)	[10]			(414,000)	[10]
Long-term Risk Management Liabilities	0	[10]			0	[10]
Total Liabilities	(570,000)	[10]			(414,000)	[10]
Total MTM Derivative Contract Net Assets (Liabilities)	429,000	[10]			54,000	[10]
Gross Amounts Offset in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	(174,000)	[10]			(440,000)	[10]
Long-term Risk Management Assets	0	[10]			0	[10]
Total Assets	(174,000)	[10]			(440,000)	[10]
Current Risk Management Liabilities	(665,000)	[10]			(502,000)	[10]
Long-term Risk Management Liabilities	0	[10]			0	[10]
Total Liabilities	(665,000)	[10]			(502,000)	[10]
Total MTM Derivative Contract Net Assets (Liabilities)	491,000	[10]			62,000	[10]
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	138,000,000	[11]			178,000,000	[11]
Long-term Risk Management Assets	365,000,000	[11]			294,000,000	[11]
Total Assets	503,000,000	[11]			472,000,000	[11]
Current Risk Management Liabilities	83,000,000	[11]			92,000,000	[11]
Long-term Risk Management Liabilities	156,000,000	[11]			131,000,000	[11]
Total Liabilities	239,000,000	[11]			223,000,000	[11]
Total MTM Derivative Contract Net Assets (Liabilities)	264,000,000	[11]			249,000,000	[11]
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	12,384,000	[11]			23,792,000	[11]
Long-term Risk Management Assets	4,157,000	[11]			4,891,000	[11]
Total Assets	16,541,000	[11]			28,683,000	[11]
Current Risk Management Liabilities	8,661,000	[11]			11,017,000	[11]
Long-term Risk Management Liabilities	2,033,000	[11]			2,057,000	[11]
Total Liabilities	10,694,000	[11]			13,074,000	[11]
Total MTM Derivative Contract Net Assets (Liabilities)	5,847,000	[11]			15,609,000	[11]
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	9,954,000	[11]			22,328,000	[11]
Long-term Risk Management Assets	2,820,000	[11]			3,317,000	[11]
Total Assets	12,774,000	[11]			25,645,000	[11]
Current Risk Management Liabilities	4,808,000	[11]			5,223,000	[11]
Long-term Risk Management Liabilities	1,378,000	[11]			1,395,000	[11]
Total Liabilities	6,186,000	[11]			6,618,000	[11]
Total MTM Derivative Contract Net Assets (Liabilities)	6,588,000	[11]			19,027,000	[11]
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	1,272,000	[11]			7,242,000	[11]
Long-term Risk Management Assets	50,422,000	[11]			45,102,000	[11]
Total Assets	51,694,000	[11]			52,344,000	[11]
Current Risk Management Liabilities	1,491,000	[11]			1,943,000	[11]
Long-term Risk Management Liabilities	4,292,000	[11]			3,013,000	[11]
Total Liabilities	5,783,000	[11]			4,956,000	[11]
Total MTM Derivative Contract Net Assets (Liabilities)	45,911,000	[11]			47,388,000	[11]
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	9,000	[11]			0	[11]
Long-term Risk Management Assets	0	[11]			0	[11]
Total Assets	9,000	[11]			0	[11]
Current Risk Management Liabilities	702,000	[11]			918,000	[11]
Long-term Risk Management Liabilities	0	[11]			0	[11]
Total Liabilities	702,000	[11]			918,000	[11]
Total MTM Derivative Contract Net Assets (Liabilities)	(693,000)	[11]			(918,000)	[11]
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	11,000	[11]			31,000	[11]
Long-term Risk Management Assets	0	[11]			0	[11]
Total Assets	11,000	[11]			31,000	[11]
Current Risk Management Liabilities	4,197,000	[11]			1,082,000	[11]
Long-term Risk Management Liabilities	0	[11]			0	[11]
Total Liabilities	4,197,000	[11]			1,082,000	[11]
Total MTM Derivative Contract Net Assets (Liabilities)	(4,186,000)	[11]			(1,051,000)	[11]
Power [Member]
Commodity:
Derivative, Energy Notional Amount	271,000,000				334,000,000
Power [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Energy Notional Amount	18,442,000				32,479,000
Power [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount	12,984,000				23,774,000
Power [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount	11,459,000				20,334,000
Power [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount	7,283,000				16,765,000
Power [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount	9,187,000				20,469,000
Coal [Member]
Commodity:
Derivative, Mass Notional Amount	2,000,000				3,000,000
Coal [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Mass Notional Amount	209,000				279,000
Coal [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Mass Notional Amount	375,000				500,000
Coal [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Mass Notional Amount	0				0
Coal [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Mass Notional Amount	0				0
Coal [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Mass Notional Amount	1,125,000				1,500,000
Natural Gas [Member]
Commodity:
Derivative, Energy Notional Amount	75,000,000				106,000,000
Natural Gas [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Energy Notional Amount	366,000				421,000
Natural Gas [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount	248,000				286,000
Natural Gas [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount	0				0
Natural Gas [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount	0				0
Natural Gas [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount	0				0
Heating Oil and Gasoline [Member]
Commodity:
Derivative, Volume Notional Amount	4,000,000				6,000,000
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Volume Notional Amount	792,000				1,089,000
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Volume Notional Amount	379,000				521,000
Heating Oil and Gasoline [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Volume Notional Amount	806,000				1,108,000
Heating Oil and Gasoline [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Volume Notional Amount	446,000				614,000
Heating Oil and Gasoline [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Volume Notional Amount	508,000				699,000
Interest Rate Contract [Member]
Commodity:
Derivative, Notional Amount	140,000,000				152,000,000
Interest Rate Contract [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Notional Amount	4,353,000				5,094,000
Interest Rate Contract [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Notional Amount	2,952,000				3,455,000
Interest Rate Contract [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Notional Amount	0				0
Interest Rate Contract [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Notional Amount	0				0
Interest Rate Contract [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Notional Amount	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	5,000,000		18,000,000
Generation & Marketing Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	49,000,000		32,000,000
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	644,000		4,847,000
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	2,239,000		6,156,000
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	0		0
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	(11,000)		64,000
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	(17,000)		23,000
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			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			(221,000)
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
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			221,000
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
Other Operation Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	(1,000,000)		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	(118,000)
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	(100,000)
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	(150,000)
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	(122,000)
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	(147,000)
Maintenance Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	(1,000,000)		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	(205,000)
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	(80,000)
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	(143,000)
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	(81,000)
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	(93,000)
Purchased Electricity for Resale [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	3,000,000		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	729,000
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	294,000
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
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
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
Regulatory Assets [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	(4,000,000)	[12]	0	[12]
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	717,000	[12]	4,000	[12]
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	(560,000)	[12]	0	[12]
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	0	[12]	0	[12]
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	(816,000)	[12]	2,000	[12]
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	(3,533,000)	[12]	3,000	[12]
Regulatory Liabilities [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	4,000,000	[12]	89,000,000	[12]
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	1,666,000	[12]	32,332,000	[12]
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	(2,991,000)	[12]	18,317,000	[12]
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	4,673,000	[12]	35,099,000	[12]
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	0	[12]	480,000	[12]
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	$ 3,959,000	[12]	$ 1,330,000	[12]

[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 contacts.

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

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

[7] 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.”

[8] 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."

[9] 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.

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

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

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