Derivatives and Hedging (Details) (USD $)	3 Months Ended			12 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended																																							3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended																																																		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended																																																																																						3 Months Ended
	Mar. 31, 2013 T MWh MMBTU gal		Mar. 31, 2012	Dec. 31, 2012 MWh MMBTU T gal		Mar. 31, 2013 Appalachian Power Co [Member] MMBTU gal T MWh	Mar. 31, 2012 Appalachian Power Co [Member]	Dec. 31, 2012 Appalachian Power Co [Member] MMBTU gal T MWh	Mar. 31, 2013 Indiana Michigan Power Co [Member] T gal MMBTU MWh	Mar. 31, 2012 Indiana Michigan Power Co [Member]	Dec. 31, 2012 Indiana Michigan Power Co [Member] MMBTU T gal MWh	Mar. 31, 2013 Ohio Power Co [Member] gal MWh MMBTU T	Mar. 31, 2012 Ohio Power Co [Member]	Dec. 31, 2012 Ohio Power Co [Member] MMBTU T MWh gal	Mar. 31, 2013 Public Service Co Of Oklahoma [Member] MWh gal MMBTU T	Mar. 31, 2012 Public Service Co Of Oklahoma [Member]	Dec. 31, 2012 Public Service Co Of Oklahoma [Member] gal MWh MMBTU T	Mar. 31, 2013 Southwestern Electric Power Co [Member] T gal MWh MMBTU	Mar. 31, 2012 Southwestern Electric Power Co [Member]	Dec. 31, 2012 Southwestern Electric Power Co [Member] gal T MMBTU MWh	Mar. 31, 2013 Risk Management Contracts [Member]		Dec. 31, 2012 Risk Management Contracts [Member]		Mar. 31, 2013 Risk Management Contracts [Member] Appalachian Power Co [Member]		Dec. 31, 2012 Risk Management Contracts [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Risk Management Contracts [Member] Indiana Michigan Power Co [Member]		Dec. 31, 2012 Risk Management Contracts [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Risk Management Contracts [Member] Ohio Power Co [Member]		Dec. 31, 2012 Risk Management Contracts [Member] Ohio Power Co [Member]		Mar. 31, 2013 Risk Management Contracts [Member] Public Service Co Of Oklahoma [Member]		Dec. 31, 2012 Risk Management Contracts [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Risk Management Contracts [Member] Southwestern Electric Power Co [Member]		Dec. 31, 2012 Risk Management Contracts [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2012 Cash Flow Hedges [Member]	Dec. 31, 2011 Cash Flow Hedges [Member]	Mar. 31, 2012 Cash Flow Hedges [Member] Appalachian Power Co [Member]	Dec. 31, 2011 Cash Flow Hedges [Member] Appalachian Power Co [Member]	Mar. 31, 2012 Cash Flow Hedges [Member] Indiana Michigan Power Co [Member]	Dec. 31, 2011 Cash Flow Hedges [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2012 Cash Flow Hedges [Member] Ohio Power Co [Member]	Dec. 31, 2011 Cash Flow Hedges [Member] Ohio Power Co [Member]	Mar. 31, 2012 Cash Flow Hedges [Member] Public Service Co Of Oklahoma [Member]	Dec. 31, 2011 Cash Flow Hedges [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2012 Cash Flow Hedges [Member] Southwestern Electric Power Co [Member]	Dec. 31, 2011 Cash Flow Hedges [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 Commodity [Member]		Dec. 31, 2012 Commodity [Member]		Mar. 31, 2013 Commodity [Member] Appalachian Power Co [Member]		Dec. 31, 2012 Commodity [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Commodity [Member] Indiana Michigan Power Co [Member]		Dec. 31, 2012 Commodity [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Commodity [Member] Ohio Power Co [Member]		Dec. 31, 2012 Commodity [Member] Ohio Power Co [Member]		Mar. 31, 2013 Commodity [Member] Public Service Co Of Oklahoma [Member]		Dec. 31, 2012 Commodity [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Commodity [Member] Southwestern Electric Power Co [Member]		Dec. 31, 2012 Commodity [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2013 Commodity [Member] Risk Management Contracts [Member]		Dec. 31, 2012 Commodity [Member] Risk Management Contracts [Member]		Mar. 31, 2013 Commodity [Member] Risk Management Contracts [Member] Appalachian Power Co [Member]		Dec. 31, 2012 Commodity [Member] Risk Management Contracts [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Commodity [Member] Risk Management Contracts [Member] Indiana Michigan Power Co [Member]		Dec. 31, 2012 Commodity [Member] Risk Management Contracts [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Commodity [Member] Risk Management Contracts [Member] Ohio Power Co [Member]		Dec. 31, 2012 Commodity [Member] Risk Management Contracts [Member] Ohio Power Co [Member]		Mar. 31, 2013 Commodity [Member] Risk Management Contracts [Member] Public Service Co Of Oklahoma [Member]		Dec. 31, 2012 Commodity [Member] Risk Management Contracts [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Commodity [Member] Risk Management Contracts [Member] Southwestern Electric Power Co [Member]		Dec. 31, 2012 Commodity [Member] Risk Management Contracts [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2013 Commodity [Member] Hedging Contracts [Member]		Dec. 31, 2012 Commodity [Member] Hedging Contracts [Member]		Mar. 31, 2013 Commodity [Member] Hedging Contracts [Member] Appalachian Power Co [Member]		Dec. 31, 2012 Commodity [Member] Hedging Contracts [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Commodity [Member] Hedging Contracts [Member] Indiana Michigan Power Co [Member]		Dec. 31, 2012 Commodity [Member] Hedging Contracts [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Commodity [Member] Hedging Contracts [Member] Ohio Power Co [Member]		Dec. 31, 2012 Commodity [Member] Hedging Contracts [Member] Ohio Power Co [Member]		Mar. 31, 2013 Commodity [Member] Hedging Contracts [Member] Public Service Co Of Oklahoma [Member]		Dec. 31, 2012 Commodity [Member] Hedging Contracts [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Commodity [Member] Hedging Contracts [Member] Southwestern Electric Power Co [Member]		Dec. 31, 2012 Commodity [Member] Hedging Contracts [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Appalachian Power Co [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Indiana Michigan Power Co [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Ohio Power Co [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Ohio Power Co [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Public Service Co Of Oklahoma [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Southwestern Electric Power Co [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Appalachian Power Co [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Indiana Michigan Power Co [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Ohio Power Co [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Ohio Power Co [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Public Service Co Of Oklahoma [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Southwestern Electric Power Co [Member]		Dec. 31, 2012 Interest Rate and Foreign Currency [Member] Hedging Contracts [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2013 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]	Dec. 31, 2012 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]	Mar. 31, 2013 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Appalachian Power Co [Member]	Dec. 31, 2012 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Appalachian Power Co [Member]	Mar. 31, 2013 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Indiana Michigan Power Co [Member]	Dec. 31, 2012 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2013 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Ohio Power Co [Member]	Dec. 31, 2012 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Ohio Power Co [Member]	Mar. 31, 2013 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Public Service Co Of Oklahoma [Member]	Dec. 31, 2012 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2013 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Southwestern Electric Power Co [Member]	Dec. 31, 2012 Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 Gross Amounts Offset in the Statement of Financial Position [Member]		Dec. 31, 2012 Gross Amounts Offset in the Statement of Financial Position [Member]		Mar. 31, 2013 Gross Amounts Offset in the Statement of Financial Position [Member] Appalachian Power Co [Member]		Dec. 31, 2012 Gross Amounts Offset in the Statement of Financial Position [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Gross Amounts Offset in the Statement of Financial Position [Member] Indiana Michigan Power Co [Member]		Dec. 31, 2012 Gross Amounts Offset in the Statement of Financial Position [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Gross Amounts Offset in the Statement of Financial Position [Member] Ohio Power Co [Member]		Dec. 31, 2012 Gross Amounts Offset in the Statement of Financial Position [Member] Ohio Power Co [Member]		Mar. 31, 2013 Gross Amounts Offset in the Statement of Financial Position [Member] Public Service Co Of Oklahoma [Member]		Dec. 31, 2012 Gross Amounts Offset in the Statement of Financial Position [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Gross Amounts Offset in the Statement of Financial Position [Member] Southwestern Electric Power Co [Member]		Dec. 31, 2012 Gross Amounts Offset in the Statement of Financial Position [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2013 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]		Dec. 31, 2012 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]		Mar. 31, 2013 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Appalachian Power Co [Member]		Dec. 31, 2012 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Indiana Michigan Power Co [Member]		Dec. 31, 2012 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Ohio Power Co [Member]		Dec. 31, 2012 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Ohio Power Co [Member]		Mar. 31, 2013 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Public Service Co Of Oklahoma [Member]		Dec. 31, 2012 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Southwestern Electric Power Co [Member]		Dec. 31, 2012 Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2013 Utility Operations Revenues [Member]	Mar. 31, 2012 Utility Operations Revenues [Member]	Mar. 31, 2013 Electric Generation, Transmission and Distribution Revenues [Member] Appalachian Power Co [Member]	Mar. 31, 2012 Electric Generation, Transmission and Distribution Revenues [Member] Appalachian Power Co [Member]	Mar. 31, 2013 Electric Generation, Transmission and Distribution Revenues [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2012 Electric Generation, Transmission and Distribution Revenues [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2013 Electric Generation, Transmission and Distribution Revenues [Member] Ohio Power Co [Member]	Mar. 31, 2012 Electric Generation, Transmission and Distribution Revenues [Member] Ohio Power Co [Member]	Mar. 31, 2013 Electric Generation, Transmission and Distribution Revenues [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2012 Electric Generation, Transmission and Distribution Revenues [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2013 Electric Generation, Transmission and Distribution Revenues [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2012 Electric Generation, Transmission and Distribution Revenues [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 Sales to AEP Affiliates [Member] Appalachian Power Co [Member]	Mar. 31, 2012 Sales to AEP Affiliates [Member] Appalachian Power Co [Member]	Mar. 31, 2013 Sales to AEP Affiliates [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2012 Sales to AEP Affiliates [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2013 Sales to AEP Affiliates [Member] Ohio Power Co [Member]	Mar. 31, 2012 Sales to AEP Affiliates [Member] Ohio Power Co [Member]	Mar. 31, 2013 Sales to AEP Affiliates [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2012 Sales to AEP Affiliates [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2013 Sales to AEP Affiliates [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2012 Sales to AEP Affiliates [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 Other Revenues [Member]	Mar. 31, 2012 Other Revenues [Member]	Mar. 31, 2013 Fuel and Other Consumables Used for Electric Generation [Member] Appalachian Power Co [Member]	Mar. 31, 2012 Fuel and Other Consumables Used for Electric Generation [Member] Appalachian Power Co [Member]	Mar. 31, 2013 Fuel and Other Consumables Used for Electric Generation [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2012 Fuel and Other Consumables Used for Electric Generation [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2013 Fuel and Other Consumables Used for Electric Generation [Member] Ohio Power Co [Member]	Mar. 31, 2012 Fuel and Other Consumables Used for Electric Generation [Member] Ohio Power Co [Member]	Mar. 31, 2013 Fuel and Other Consumables Used for Electric Generation [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2012 Fuel and Other Consumables Used for Electric Generation [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2013 Fuel and Other Consumables Used for Electric Generation [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2012 Fuel and Other Consumables Used for Electric Generation [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 Regulatory Assets [Member]		Mar. 31, 2012 Regulatory Assets [Member]		Mar. 31, 2013 Regulatory Assets [Member] Appalachian Power Co [Member]		Mar. 31, 2012 Regulatory Assets [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Regulatory Assets [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2012 Regulatory Assets [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Regulatory Assets [Member] Ohio Power Co [Member]		Mar. 31, 2012 Regulatory Assets [Member] Ohio Power Co [Member]		Mar. 31, 2013 Regulatory Assets [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2012 Regulatory Assets [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Regulatory Assets [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2012 Regulatory Assets [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2013 Regulatory Liabilities [Member]		Mar. 31, 2012 Regulatory Liabilities [Member]		Mar. 31, 2013 Regulatory Liabilities [Member] Appalachian Power Co [Member]		Mar. 31, 2012 Regulatory Liabilities [Member] Appalachian Power Co [Member]		Mar. 31, 2013 Regulatory Liabilities [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2012 Regulatory Liabilities [Member] Indiana Michigan Power Co [Member]		Mar. 31, 2013 Regulatory Liabilities [Member] Ohio Power Co [Member]		Mar. 31, 2012 Regulatory Liabilities [Member] Ohio Power Co [Member]		Mar. 31, 2013 Regulatory Liabilities [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2012 Regulatory Liabilities [Member] Public Service Co Of Oklahoma [Member]		Mar. 31, 2013 Regulatory Liabilities [Member] Southwestern Electric Power Co [Member]		Mar. 31, 2012 Regulatory Liabilities [Member] Southwestern Electric Power Co [Member]
Commodity:
Power (In MWHs)	406,000,000			498,000,000		62,679,000		94,059,000	43,390,000		64,791,000	88,625,000		132,188,000	8,000		0	9,000		0
Coal (In Tons)	7,000,000			10,000,000		932,000		1,401,000	2,175,000		2,711,000	2,213,000		3,033,000	1,489,000		1,980,000	789,000		1,312,000
Natural Gas (In MMBtus)	176,000,000			147,000,000		8,213,000		10,077,000	5,676,000		6,922,000	11,613,000		14,163,000	0		0	0		0
Heating Oil and Gasoline (In Gallons)	6,000,000			6,000,000		1,177,000		1,050,000	580,000		532,000	1,386,000		1,260,000	589,000		616,000	724,000		585,000
Interest Rate	$ 214,000,000			$ 235,000,000		$ 22,108,000		$ 24,146,000	$ 15,278,000		$ 16,584,000	$ 31,259,000		$ 33,934,000	$ 0		$ 0	$ 0		$ 0
Interest Rate and Foreign Currency	874,000,000			1,199,000,000		0		0	0		200,000,000	0		0	0		0	0		0
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets	14,000,000			7,000,000		1,837,000		1,262,000	1,270,000		867,000	2,598,000		1,774,000	0		0	0		0
Cash Collateral Paid Netted Against Risk Management Liabilities	29,000,000			50,000,000		4,888,000		11,029,000	3,378,000		7,576,000	6,912,000		15,500,000	1,000		0	2,000		0
Fair Value of Derivative Instruments
Current Risk Management Assets	162,000,000			191,000,000		23,127,000		30,960,000	18,086,000		26,974,000	33,481,000		44,313,000	712,000		509,000	727,000		695,000																																																													509,000,000	[1]	589,000,000	[1]	86,551,000	[1]	127,645,000	[1]	61,736,000	[1]	93,268,000	[1]	126,082,000	[1]	183,064,000	[1]	1,723,000	[1]	1,657,000	[1]	2,765,000	[1]	2,804,000	[1]	39,000,000	[1]	32,000,000	[1]	1,189,000	[1]	338,000	[1]	800,000	[1]	220,000	[1]	1,657,000	[1]	464,000	[1]	57,000	[1]	42,000	[1]	69,000	[1]	41,000	[1]																									4,000,000	[1]	3,000,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	552,000,000	624,000,000	87,740,000	127,983,000	62,536,000	93,488,000	127,739,000	183,528,000	1,780,000	1,699,000	2,834,000	2,845,000	(390,000,000)	[2]	(433,000,000)	[2]	(64,613,000)	[3]	(97,023,000)	[3]	(44,450,000)	[3]	(66,514,000)	[3]	(94,258,000)	[3]	(139,215,000)	[3]	(1,068,000)	[3]	(1,190,000)	[3]	(2,107,000)	[3]	(2,150,000)	[3]	162,000,000	[4]	191,000,000	[4]	23,127,000	[4]	30,960,000	[4]	18,086,000	[4]	26,974,000	[4]	33,481,000	[4]	44,313,000	[4]	712,000	[4]	509,000	[4]	727,000	[4]	695,000	[4]
Long-term Risk Management Assets	341,000,000			368,000,000		24,016,000		34,360,000	16,595,000		23,569,000	33,956,000		48,288,000	4,000		31,000	4,000		0																																																													471,000,000	[1]	528,000,000	[1]	39,728,000	[1]	60,498,000	[1]	27,454,000	[1]	41,553,000	[1]	56,173,000	[1]	85,023,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	6,000,000	[1]	5,000,000	[1]	131,000	[1]	215,000	[1]	89,000	[1]	148,000	[1]	184,000	[1]	303,000	[1]	4,000	[1]	0	[1]	4,000	[1]	0	[1]																									1,000,000	[1]	1,000,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	478,000,000	534,000,000	39,859,000	60,713,000	27,543,000	41,701,000	56,357,000	85,326,000	4,000	0	4,000	0	(137,000,000)	[2]	(166,000,000)	[2]	(15,843,000)	[3]	(26,353,000)	[3]	(10,948,000)	[3]	(18,132,000)	[3]	(22,401,000)	[3]	(37,038,000)	[3]	0	[3]	31,000	[3]	0	[3]	0	[3]	341,000,000	[4]	368,000,000	[4]	24,016,000	[4]	34,360,000	[4]	16,595,000	[4]	23,569,000	[4]	33,956,000	[4]	48,288,000	[4]	4,000	[4]	31,000	[4]	4,000	[4]	0	[4]
Total Assets	503,000,000			559,000,000		47,143,000		65,320,000	34,681,000		50,543,000	67,437,000		92,601,000	716,000		540,000	731,000		695,000	463,000,000	[5],[6]	517,000,000	[5],[7]	46,156,000	[5],[8]	65,018,000	[5],[8]	34,021,000	[5],[8]	50,343,000	[5],[8]	66,065,000	[5],[8]	92,185,000	[5],[8]	655,000	[5],[8]	515,000	[5],[8]	658,000	[5],[8]	671,000	[5],[8]																																					980,000,000	[1]	1,117,000,000	[1]	126,279,000	[1]	188,143,000	[1]	89,190,000	[1]	134,821,000	[1]	182,255,000	[1]	268,087,000	[1]	1,723,000	[1]	1,657,000	[1]	2,765,000	[1]	2,804,000	[1]	45,000,000	[1]	37,000,000	[1]	1,320,000	[1]	553,000	[1]	889,000	[1]	368,000	[1]	1,841,000	[1]	767,000	[1]	61,000	[1]	42,000	[1]	73,000	[1]	41,000	[1]																									5,000,000	[1]	4,000,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	1,030,000,000	1,158,000,000	127,599,000	188,696,000	90,079,000	135,189,000	184,096,000	268,854,000	1,784,000	1,699,000	2,838,000	2,845,000	(527,000,000)	[2]	(599,000,000)	[2]	(80,456,000)	[3]	(123,376,000)	[3]	(55,398,000)	[3]	(84,646,000)	[3]	(116,659,000)	[3]	(176,253,000)	[3]	(1,068,000)	[3]	(1,159,000)	[3]	(2,107,000)	[3]	(2,150,000)	[3]	503,000,000	[4]	559,000,000	[4]	47,143,000	[4]	65,320,000	[4]	34,681,000	[4]	50,543,000	[4]	67,437,000	[4]	92,601,000	[4]	716,000	[4]	540,000	[4]	731,000	[4]	695,000	[4]
Current Risk Management Liabilities	94,000,000			155,000,000		12,048,000		16,698,000	8,691,000		31,517,000	17,586,000		24,155,000	3,006,000		5,848,000	824,000		1,128,000																																																													467,000,000	[1]	546,000,000	[1]	78,306,000	[1]	119,430,000	[1]	54,278,000	[1]	82,433,000	[1]	114,172,000	[1]	171,397,000	[1]	4,074,000	[1]	7,021,000	[1]	2,931,000	[1]	3,261,000	[1]	23,000,000	[1]	43,000,000	[1]	651,000	[1]	1,182,000	[1]	450,000	[1]	807,000	[1]	919,000	[1]	1,658,000	[1]	0	[1]	17,000	[1]	0	[1]	17,000	[1]																									1,000,000	[1]	35,000,000	[1]	0	[1]	0	[1]	0	[1]	19,524,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	491,000,000	624,000,000	78,957,000	120,612,000	54,728,000	102,764,000	115,091,000	173,055,000	4,074,000	7,038,000	2,931,000	3,278,000	(397,000,000)	[2]	(469,000,000)	[2]	(66,909,000)	[3]	(103,914,000)	[3]	(46,037,000)	[3]	(71,247,000)	[3]	(97,505,000)	[3]	(148,900,000)	[3]	(1,068,000)	[3]	(1,190,000)	[3]	(2,107,000)	[3]	(2,150,000)	[3]	94,000,000	[4]	155,000,000	[4]	12,048,000	[4]	16,698,000	[4]	8,691,000	[4]	31,517,000	[4]	17,586,000	[4]	24,155,000	[4]	3,006,000	[4]	5,848,000	[4]	824,000	[4]	1,128,000	[4]
Long-term Risk Management Liabilities	185,000,000			214,000,000		12,764,000		18,476,000	9,497,000		13,898,000	18,048,000		25,965,000	0		31,000																																																																329,000,000	[1]	383,000,000	[1]	29,230,000	[1]	47,281,000	[1]	20,876,000	[1]	33,714,000	[1]	41,330,000	[1]	66,448,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	2,000,000	[1]	6,000,000	[1]	132,000	[1]	424,000	[1]	90,000	[1]	292,000	[1]	186,000	[1]	596,000	[1]	1,000	[1]	0	[1]	2,000	[1]	0	[1]																									6,000,000	[1]	6,000,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	337,000,000	395,000,000	29,362,000	47,705,000	20,966,000	34,006,000	41,516,000	67,044,000	1,000	0	2,000	0	(152,000,000)	[2]	(181,000,000)	[2]	(16,598,000)	[3]	(29,229,000)	[3]	(11,469,000)	[3]	(20,108,000)	[3]	(23,468,000)	[3]	(41,079,000)	[3]	(1,000)	[3]	31,000	[3]	(2,000)	[3]	0	[3]	185,000,000	[4]	214,000,000	[4]	12,764,000	[4]	18,476,000	[4]	9,497,000	[4]	13,898,000	[4]	18,048,000	[4]	25,965,000	[4]	0	[4]	31,000	[4]	0	[4]	0	[4]
Total Liabilities	279,000,000			369,000,000		24,812,000		35,174,000	18,188,000		45,415,000	35,634,000		50,120,000	3,006,000		5,879,000	824,000		1,128,000	268,000,000	[5],[6]	292,000,000	[5],[7]	24,362,000	[5],[8]	33,819,000	[5],[8]	17,877,000	[5],[8]	24,960,000	[5],[8]	34,998,000	[5],[8]	48,217,000	[5],[8]	3,005,000	[5],[8]	5,879,000	[5],[8]	822,000	[5],[8]	1,128,000	[5],[8]																																					796,000,000	[1]	929,000,000	[1]	107,536,000	[1]	166,711,000	[1]	75,154,000	[1]	116,147,000	[1]	155,502,000	[1]	237,845,000	[1]	4,074,000	[1]	7,021,000	[1]	2,931,000	[1]	3,261,000	[1]	25,000,000	[1]	49,000,000	[1]	783,000	[1]	1,606,000	[1]	540,000	[1]	1,099,000	[1]	1,105,000	[1]	2,254,000	[1]	1,000	[1]	17,000	[1]	2,000	[1]	17,000	[1]																									7,000,000	[1]	41,000,000	[1]	0	[1]	0	[1]	0	[1]	19,524,000	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	828,000,000	1,019,000,000	108,319,000	168,317,000	75,694,000	136,770,000	156,607,000	240,099,000	4,075,000	7,038,000	2,933,000	3,278,000	(549,000,000)	[2]	(650,000,000)	[2]	(83,507,000)	[3]	(133,143,000)	[3]	(57,506,000)	[3]	(91,355,000)	[3]	(120,973,000)	[3]	(189,979,000)	[3]	(1,069,000)	[3]	(1,159,000)	[3]	(2,109,000)	[3]	(2,150,000)	[3]	279,000,000	[4]	369,000,000	[4]	24,812,000	[4]	35,174,000	[4]	18,188,000	[4]	45,415,000	[4]	35,634,000	[4]	50,120,000	[4]	3,006,000	[4]	5,879,000	[4]	824,000	[4]	1,128,000	[4]
Total MTM Derivative Contract Net Assets (Liabilities)																																																																																	184,000,000	[1]	188,000,000	[1]	18,743,000	[1]	21,432,000	[1]	14,036,000	[1]	18,674,000	[1]	26,753,000	[1]	30,242,000	[1]	(2,351,000)	[1]	(5,364,000)	[1]	(166,000)	[1]	(457,000)	[1]	20,000,000	[1]	(12,000,000)	[1]	537,000	[1]	(1,053,000)	[1]	349,000	[1]	(731,000)	[1]	736,000	[1]	(1,487,000)	[1]	60,000	[1]	25,000	[1]	71,000	[1]	24,000	[1]																									(2,000,000)	[1]	(37,000,000)	[1]	0	[1]	0	[1]	0	[1]	(19,524,000)	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	202,000,000	139,000,000	19,280,000	20,379,000	14,385,000	(1,581,000)	27,489,000	28,755,000	(2,291,000)	(5,339,000)	(95,000)	(433,000)	22,000,000	[2]	51,000,000	[2]	3,051,000	[3]	9,767,000	[3]	2,108,000	[3]	6,709,000	[3]	4,314,000	[3]	13,726,000	[3]	1,000	[3]	0	[3]	2,000	[3]	0	[3]	224,000,000	[4]	190,000,000	[4]	22,331,000	[4]	30,146,000	[4]	16,493,000	[4]	5,128,000	[4]	31,803,000	[4]	42,481,000	[4]	(2,290,000)	[4]	(5,339,000)	[4]	(93,000)	[4]	(433,000)	[4]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	18,000,000		6,000,000			213,000	2,601,000		251,000	6,429,000		509,000	5,362,000		2,058,000	(5,179,000)		395,000	(6,757,000)																																																																																																																																																																																																																										8,000,000	10,000,000	679,000	(327,000)	4,947,000	2,813,000	1,714,000	8,493,000	47,000	(5,000)	28,000	(51,000)	0	0	0	0	0	0	0	0	0	0	14,000,000	3,000,000	0	0	0	0	0	0	0	0	0	0
Amount of Gain (Loss) Recognized on Risk Management Contracts																																																																																																																																																																																																																																																																															2,000,000	[9]	(21,000,000)	[9]	0	[9]	(3,481,000)	[9]	486,000	[9]	(3,110,000)	[9]	(1,205,000)	[9]	(3,131,000)	[9]	2,010,000	[9]	(5,201,000)	[9]	271,000	[9]	(6,727,000)	[9]	(6,000,000)	[9]	14,000,000	[9]	(466,000)	[9]	6,409,000	[9]	(5,182,000)	[9]	6,726,000	[9]	0	[9]	0	[9]	1,000	[9]	27,000	[9]	96,000	[9]	21,000	[9]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Hedging Assets	24,000,000	[10]		24,000,000	[10]																																																				24,000,000	[10]	24,000,000	[10]	987,000	[10]	302,000	[10]	660,000	[10]	200,000	[10]	1,372,000	[10]	416,000	[10]	61,000	[10]	25,000	[10]	73,000	[10]	24,000	[10]																																																	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]
Hedging Liabilities	6,000,000	[10]		73,000,000	[10]																																																				4,000,000	[10]	36,000,000	[10]	450,000	[10]	1,355,000	[10]	311,000	[10]	931,000	[10]	636,000	[10]	1,903,000	[10]	1,000	[10]	0	[10]	2,000	[10]	0	[10]																																																	2,000,000	[10]	37,000,000	[10]	0	[10]	0	[10]	0	[10]	19,524,000	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]	0	[10]
AOCI Gain (Loss) Net of Tax	(14,000,000)			(38,000,000)																																									(34,000,000)	(23,000,000)	(824,000)	(285,000)	(12,828,000)	(15,284,000)	5,965,000	7,706,000	7,096,000	7,149,000	(17,299,000)	(15,524,000)	12,000,000		(8,000,000)		361,000		(644,000)		236,000		(446,000)		494,000		(912,000)		44,000		21,000		51,000		22,000																																																		(26,000,000)		(30,000,000)		2,330,000		2,077,000		(17,206,000)		(19,647,000)		7,755,000		8,095,000		6,270,000		6,460,000		(15,004,000)		(15,571,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months	6,000,000			(12,000,000)																																																					10,000,000		(8,000,000)		363,000		(507,000)		235,000		(355,000)		495,000		(720,000)		41,000		21,000		49,000		22,000																																																		(4,000,000)		(4,000,000)		(1,013,000)		(1,013,000)		(1,640,000)		(1,600,000)		1,359,000		1,359,000		759,000		759,000		(2,267,000)		(2,267,000)
Maximum Term for Exposure to Variability of Future Cash Flows	30 months					21 months			21 months			21 months			21 months			21 months
Collateral Triggering Events [Abstract]
Liabilities for Derivative Contracts with Credit Downgrade Triggers	5,000,000			7,000,000		1,377,000		2,159,000	951,000		1,483,000	1,946,000		3,034,000	0		0	0		0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post	37,000,000			32,000,000		3,635,000		3,699,000	2,512,000		2,540,000	5,140,000		5,198,000	625,000		1,509,000	736,000		1,778,000
Amount Attributable to RTO and ISO Activities	35,000,000			31,000,000		3,531,000		3,510,000	2,440,000		2,411,000	4,992,000		4,933,000	562,000		1,429,000	662,000		1,683,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements	366,000,000			469,000,000		32,626,000		49,465,000	22,546,000		53,499,000	46,131,000		69,516,000	11,000		0	12,000		0
Amount of Cash Collateral Posted	12,000,000			8,000,000		0		1,822,000	0		1,252,000	0		2,561,000	0		0	0		0
Additional Settlement Liability if Cross Default Provision is Triggered	231,000,000			328,000,000		20,446,000		30,160,000	14,129,000		40,240,000	28,909,000		42,386,000	9,000		0	11,000		0
Derivatives and Hedging (Textuals) [Abstract]
Cash Collateral Received Netted Against Risk Management Assets	14,000,000			7,000,000		1,837,000		1,262,000	1,270,000		867,000	2,598,000		1,774,000	0		0	0		0
Cash Collateral Paid Netted Against Risk Management Liabilities	29,000,000			50,000,000		4,888,000		11,029,000	3,378,000		7,576,000	6,912,000		15,500,000	1,000		0	2,000		0
Maximum Term for Exposure to Variability of Future Cash Flows	30 months					21 months			21 months			21 months			21 months			21 months
Gain (Loss) on Fair Value Hedging Instrument	(1,000,000)		1,000,000
Gain (Loss) on Fair Value Portion of Long Term Debt	$ 1,000,000		$ (1,000,000)

[1] 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."

[2] 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.

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

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

[5] 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.''

[6] The March 31, 2013 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $6 million in 2013, ($4) million in periods 2014-2016 and ($3) million in periods 2017-2018; Level 2 matures $17 million in 2013, $73 million in periods 2014-2016, $14 million in periods 2017-2018 and $6 million in periods 2019-2030; Level 3 matures $6 million in 2013, $27 million in periods 2014-2016, $18 million in periods 2017-2018 and $24 million in periods 2019-2030. Risk management commodity contracts are substantially comprised of power contracts.

[7] The December 31, 2012 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $9 million in 2013, ($3) million in periods 2014-2016 and ($4) million in periods 2017-2018; Level 2 matures $16 million in 2013, $61 million in periods 2014-2016, $16 million in periods 2017-2018 and $7 million in periods 2019-2030; Level 3 matures $18 million in 2013, $31 million in periods 2014-2016, $13 million in periods 2017-2018 and $24 million in periods 2019-2030. Risk management commodity contracts are substantially comprised of power contracts.

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

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

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