Financing Activities (Details) (USD $)	3 Months Ended			9 Months Ended							9 Months Ended										3 Months Ended		9 Months Ended			9 Months Ended	1 Months Ended	9 Months Ended					3 Months Ended		9 Months Ended			9 Months Ended	1 Months Ended	9 Months Ended									3 Months Ended		9 Months Ended			9 Months Ended						3 Months Ended		9 Months Ended			9 Months Ended				3 Months Ended		9 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013		Sep. 30, 2014 AEP Subsidiaries [Member]	Dec. 31, 2013 AEP Subsidiaries [Member]	Sep. 30, 2014 AEP Subsidiaries [Member] Notes Payable One [Member]	Sep. 30, 2014 AEP Subsidiaries [Member] Notes Payable Two [Member]	Sep. 30, 2014 AEP Subsidiaries [Member] Notes Payable Three [Member]	Sep. 30, 2014 AEP Generating Co [Member] Senior Unsecured Notes One [Member]	Sep. 30, 2014 AEP Texas Central Co [Member] Securitization Bonds One [Member]	Sep. 30, 2014 AEP Texas Central Co [Member] Securitization Bonds Two [Member]	Sep. 30, 2014 AEP Texas Central Co [Member] Securitization Bonds Three [Member]	Sep. 30, 2014 AEP Texas Central Co [Member] Senior Unsecured Notes One [Member]	Sep. 30, 2014 AEP Texas Central Co [Member] Senior Unsecured Notes Two [Member]	Sep. 30, 2014 AEP Texas Central Co [Member] Senior Unsecured Notes Three [Member]	Sep. 30, 2014 Appalachian Power Co [Member]	Sep. 30, 2013 Appalachian Power Co [Member]	Sep. 30, 2014 Appalachian Power Co [Member]	Sep. 30, 2013 Appalachian Power Co [Member]	Dec. 31, 2013 Appalachian Power Co [Member]	Sep. 30, 2014 Appalachian Power Co [Member] Securitization Bonds One [Member]	Oct. 23, 2014 Appalachian Power Co [Member] Pollution Control Bonds One [Member] Subsequent Event [Member]	Sep. 30, 2014 Appalachian Power Co [Member] Senior Unsecured Notes One [Member]		Sep. 30, 2014 Appalachian Power Co [Member] Senior Unsecured Notes Two [Member]	Sep. 30, 2014 Appalachian Power Co [Member] Long-term Debt [Member]	Sep. 30, 2014 Appalachian Power Co [Member] Land Note [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member]	Sep. 30, 2013 Indiana Michigan Power Co [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member]	Sep. 30, 2013 Indiana Michigan Power Co [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member] Notes Payable One [Member]	Oct. 23, 2014 Indiana Michigan Power Co [Member] Notes Payable One [Member] Subsequent Event [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member] Notes Payable Two [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member] Notes Payable Three [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member] Notes Payable Four [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member] Notes Payable Five [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member] Pollution Control Bonds One [Member]		Sep. 30, 2014 Indiana Michigan Power Co [Member] Pollution Control Bonds Two [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member] Long-term Debt [Member]	Sep. 30, 2014 Indiana Michigan Power Co [Member] Long Term Debt Two [Member]	Sep. 30, 2014 Ohio Power Co [Member]	Sep. 30, 2013 Ohio Power Co [Member]	Sep. 30, 2014 Ohio Power Co [Member]	Sep. 30, 2013 Ohio Power Co [Member]	Dec. 31, 2013 Ohio Power Co [Member]	Sep. 30, 2014 Ohio Power Co [Member] Securitization Bonds One [Member]	Sep. 30, 2014 Ohio Power Co [Member] Pollution Control Bonds One [Member]	Sep. 30, 2014 Ohio Power Co [Member] Pollution Control Bonds Two [Member]	Sep. 30, 2014 Ohio Power Co [Member] Pollution Control Bonds Three [Member]	Sep. 30, 2014 Ohio Power Co [Member] Senior Unsecured Notes One [Member]	Sep. 30, 2014 Ohio Power Co [Member] Long-term Debt [Member]	Sep. 30, 2014 Public Service Co Of Oklahoma [Member]	Sep. 30, 2013 Public Service Co Of Oklahoma [Member]	Sep. 30, 2014 Public Service Co Of Oklahoma [Member]	Sep. 30, 2013 Public Service Co Of Oklahoma [Member]	Dec. 31, 2013 Public Service Co Of Oklahoma [Member]	Sep. 30, 2014 Public Service Co Of Oklahoma [Member] Pollution Control Bonds One [Member]	Sep. 30, 2014 Public Service Co Of Oklahoma [Member] Long-term Debt [Member]		Sep. 30, 2014 Public Service Co Of Oklahoma [Member] Long Term Debt Two [Member]	Sep. 30, 2014 Southwestern Electric Power Co [Member]	Sep. 30, 2013 Southwestern Electric Power Co [Member]	Sep. 30, 2014 Southwestern Electric Power Co [Member]	Sep. 30, 2013 Southwestern Electric Power Co [Member]	Dec. 31, 2013 Southwestern Electric Power Co [Member]	Sep. 30, 2014 Southwestern Electric Power Co [Member] Notes Payable One [Member]	Sep. 30, 2014 Southwestern Electric Power Co [Member] Long-term Debt [Member]		Sep. 30, 2014 AEP Transmission Company, LLC [Member] Senior Unsecured Notes One [Member]	Sep. 30, 2014 Kentucky Power Co [Member] Pollution Control Bonds One [Member]		Sep. 30, 2014 Kentucky Power Co [Member] Senior Unsecured Notes One [Member]	Sep. 30, 2014 Kentucky Power Co [Member] Senior Unsecured Notes Two [Member]	Sep. 30, 2014 Kentucky Power Co [Member] Long-term Debt [Member]	Sep. 30, 2014 Transource Missouri [Member] Long-term Debt [Member]	Sep. 30, 2014 AEP Generation Resources [Member] Pollution Control Bonds One [Member]	Sep. 30, 2014 AEP Generation Resources [Member] Pollution Control Bonds Two [Member]		Sep. 30, 2014 AEP Generation Resources [Member] Pollution Control Bonds Three [Member]
Long-term Debt
Senior Unsecured Notes	$ 12,017,000,000			$ 12,017,000,000			$ 11,799,000,000
Pollution Control Bonds	1,963,000,000			1,963,000,000			1,932,000,000
Notes Payable	277,000,000			277,000,000			369,000,000
Securitization Bonds	2,413,000,000			2,413,000,000			2,686,000,000
Spent Nuclear Fuel Obligation	265,000,000	[1]		265,000,000	[1]		265,000,000	[1]
Other Long-term Debt	1,155,000,000			1,155,000,000			1,360,000,000
Fair Value of Interest Rate Hedges	(7,000,000)			(7,000,000)			(9,000,000)
Unamortized Discount, Net	(25,000,000)			(25,000,000)			(25,000,000)
Total Long-term Debt Outstanding	18,058,000,000			18,058,000,000			18,377,000,000														3,980,107,000		3,980,107,000		4,194,357,000								1,948,931,000		1,948,931,000		2,039,016,000												2,297,004,000		2,297,004,000		2,735,175,000							1,041,056,000		1,041,056,000		999,810,000					2,140,348,000		2,140,348,000		2,043,332,000
Long-term Debt Due Within One Year	2,381,000,000			2,381,000,000			1,549,000,000		409,000,000	416,000,000											652,211,000		652,211,000		342,360,000								238,698,000		238,698,000		294,845,000												131,496,000		131,496,000		438,595,000							424,000		424,000		34,115,000					306,750,000		306,750,000		3,250,000
Long-term Debt	15,677,000,000			15,677,000,000			16,828,000,000		2,230,000,000	2,532,000,000											3,241,896,000		3,241,896,000		3,765,997,000								1,710,233,000		1,710,233,000		1,744,171,000												2,165,508,000		2,165,508,000		2,296,580,000							1,040,632,000		1,040,632,000		965,695,000					1,833,598,000		1,833,598,000		2,040,082,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances				1,217,000,000	[2]													50,000,000	50,000,000	100,000,000								300,000,000	[3]															100,000,000	[3]																					75,000,000	[3]								100,000,000	[3]	30,000,000	65,000,000	[4]	120,000,000			49,000,000	79,000,000	60,000,000	[4]	39,000,000
Retirements and Principal Payments				1,538,000,000		2,281,000,000					5,000,000	2,000,000	1,000,000	7,000,000	127,000,000	72,000,000	26,000,000						512,702,000	345,021,000		12,678,000				200,000,000	300,000,000	24,000			190,550,000	137,544,000		29,275,000	5,000,000	22,332,000	15,472,000	10,716,000	4,402,000			100,000,000	7,563,000	790,000			438,583,000	1,146,000,000		34,936,000	79,450,000	60,000,000	39,130,000	225,000,000	67,000			34,010,000	301,000		33,700,000			310,000			3,250,000	3,250,000		3,250,000								120,000,000
Interest Rate (Percentage)												8.03%	7.59%	6.33%	5.09%	6.25%	0.88%	2.61%	3.81%	4.67%						2.01%	1.625%	4.40%		4.95%		13.718%										2.12%	4.00%	1.75%		6.25%		6.00%						0.958%	3.25%	3.875%	2.875%	4.85%	1.149%						5.25%			3.00%						4.58%			5.42%			4.18%	4.33%
Interest Rate (Variable)											Variable																				Variable							Variable		Variable	Variable						Variable																			Variable									Variable			Variable				Variable	Variable	Variable	Variable		Variable
Due Date											2017	2026	2026	2037	2015	2016	2017	2019	2026	2044						2024	2018	2044		2015	2015	2026						2017		2016	2016	2016	2014	2018		2014	2015	2025						2018	2014	2014	2014	2014	2028						2014	2016		2027						2032	2017		2044	2036		2026	2026	2015	2018	2015	2038		2015
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Utility Money Pool																							44,215,000												130,128,000																120,264,000											176,950,000									153,503,000
Maximum Loans to Utility Money Pool																							542,186,000												158,857,000																405,350,000											0									49,869,000
Average Borrowings from Utility Money Pool																							14,038,000												59,863,000																34,841,000											93,679,000									82,953,000
Average Loans to Utility Money Pool																							122,105,000												47,695,000																82,518,000											0									22,408,000
Net Loans (Borrowings) to/from Utility Money Pool																					70,090,000		70,090,000										(82,400,000)		(82,400,000)														23,745,000		23,745,000									(100,867,000)		(100,867,000)							(6,329,000)		(6,329,000)
Authorized Short-term Borrowing Limit																							600,000,000												500,000,000																400,000,000											300,000,000									350,000,000
Maximum and Minimum Interest Rates
Maximum Interest Rate																							0.33%	0.43%											0.33%	0.43%															0.33%	0.43%										0.33%	0.43%								0.33%	0.43%
Minimum Interest Rate																							0.24%	0.28%											0.24%	0.28%															0.24%	0.28%										0.24%	0.28%								0.24%	0.28%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
Average Interest Rate for Funds Borrowed																							0.26%	0.33%											0.27%	0.36%															0.27%	0.34%										0.27%	0.34%								0.28%	0.33%
Average Interest Rate for Funds Loaned																							0.28%	0.34%											0.30%	0.33%															0.29%	0.32%										0.00%	0.32%								0.27%	0.36%
Short-term Debt:
Securitized Debt for Receivables	750,000,000	[5]		750,000,000	[5]		700,000,000	[5]
Commercial Paper	532,000,000			532,000,000			57,000,000
Total Short-term Debt	1,282,000,000			1,282,000,000			757,000,000
Securitized Debt for Receivables	0.22%	[6]		0.22%	[6]		0.23%	[6]
Commercial Paper	0.28%	[6]		0.28%	[6]		0.29%	[6]
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable	0.21%		0.23%	0.22%		0.23%
Net Uncollectible Accounts Receivable Written Off	16,000,000		12,000,000	32,000,000		26,000,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts	1,000,000,000			1,000,000,000			929,000,000
Total Principal Outstanding	750,000,000			750,000,000			700,000,000
Delinquent Securitized Accounts Receivable	57,000,000			57,000,000			45,000,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable	13,000,000			13,000,000			16,000,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable	269,000,000			269,000,000			331,000,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues																					134,986,000		134,986,000		156,599,000								136,897,000		136,897,000		139,257,000												345,545,000		345,545,000		324,287,000							156,781,000		156,781,000		115,260,000					179,687,000		179,687,000		149,337,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold																					2,166,000	1,575,000	6,626,000	4,590,000									2,011,000	1,762,000	5,836,000	4,744,000													7,213,000	5,076,000	21,358,000	14,440,000								1,745,000	1,549,000	4,417,000	4,314,000						1,890,000	1,649,000	5,035,000	4,413,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit																					354,406,000	340,438,000	1,137,564,000	1,081,615,000									372,422,000	384,316,000	1,132,603,000	1,097,563,000													668,112,000	658,829,000	1,980,764,000	2,017,746,000								398,567,000	382,167,000	1,014,320,000	944,062,000						466,828,000	450,294,000	1,278,325,000	1,171,306,000
Financing Activities (Textuals) [Abstract]
Reacquired Pollution Controls Bonds Held by Trustees	435,000,000			435,000,000																													40,000,000		40,000,000														395,000,000		395,000,000
Maximum Percentage Debt to Capitalization				67.50%																			67.50%												67.50%																											67.50%									67.50%
Total Commitment from Bank Conduits to Finance Receivables	750,000,000		700,000,000	750,000,000		700,000,000
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition	309,000,000			309,000,000			309,000,000
Short-term Debt, Refinanced, Amount																																																																																	80,000,000
Remarketed Debt																											$ 100,000,000

[1] Pursuant to the Nuclear Waste Policy Act of 1982, I&M, a nuclear licensee, has an obligation to the United States Department of Energy for spent nuclear fuel disposal. The obligation includes a one-time fee for nuclear fuel consumed prior to April 7, 1983. Trust fund assets related to this obligation were $309 million and $309 million as of September 30, 2014 and December 31, 2013, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on our condensed balance sheets.

[2] Amount indicated on the statement of cash flows is net of issuance costs and premium or discount and will not tie to the issuance amount.

[3] Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.

[4] Pollution Control Bonds are subject to redemption earlier than the maturity date. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year.

[5] Amount of securitized debt for receivables as accounted for under the ''Transfers and Servicing'' accounting guidance

[6] Weighted average rate.