Financing Activities (Details) (USD $)	3 Months Ended			1 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Apr. 23, 2015	Dec. 31, 2014
Long-term Debt
Senior Unsecured Notes	$ 13,344,000,000				$ 12,647,000,000
Pollution Control Bonds	1,963,000,000				1,963,000,000
Notes Payable	331,000,000				357,000,000
Securitization Bonds	2,227,000,000				2,380,000,000
Spent Nuclear Fuel Obligation	266,000,000	[1]			266,000,000	[1]
Other Long-term Debt	1,127,000,000				1,101,000,000
Fair Value of Interest Rate Hedges	(2,000,000)				(6,000,000)
Unamortized Discount, Net	(27,000,000)				(24,000,000)
Total Long-term Debt Outstanding	19,229,000,000				18,684,000,000
Long-term Debt Due Within One Year	2,451,000,000				2,503,000,000
Long-term Debt	16,778,000,000				16,181,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances	784,000,000	[2]
Retirements and Principal Payments	239,000,000		370,000,000
Short-term Debt:
Securitized Debt for Receivables	740,000,000	[3]			744,000,000	[3]
Commercial Paper	115,000,000				602,000,000
Total Short-term Debt	855,000,000				1,346,000,000
Securitized Debt for Receivables	0.26%	[4]			0.22%	[4]
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable	0.26%		0.24%
Net Uncollectible Accounts Receivable Written Off	7,000,000		8,000,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts	988,000,000				975,000,000
Total Principal Outstanding	740,000,000				744,000,000
Delinquent Securitized Accounts Receivable	52,000,000				44,000,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable	17,000,000				13,000,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable	265,000,000				335,000,000
Financing Activities (Textuals) [Abstract]
Reacquired Pollution Controls Bonds Held by Trustees	385,000,000
Maximum Percentage Debt to Capitalization	67.50%
Total Commitment from Bank Conduits to Finance Receivables	750,000,000		700,000,000
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition	309,000,000				309,000,000
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	0.51%	[4]			0.59%	[4]
AEP Subsidiaries [Member]
Long-term Debt
Long-term Debt Due Within One Year	434,000,000				431,000,000
Long-term Debt	2,084,000,000				2,260,000,000
AEP Subsidiaries [Member] | Notes Payable [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	1,000,000
Interest Rate (Variable)	Variable
Due Date	2017
AEP Generating Co [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	4,000,000
Interest Rate (Percentage)	6.33%
Due Date	2037
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding	3,969,405,000				3,980,274,000
Long-term Debt Due Within One Year	552,409,000				552,212,000
Long-term Debt	3,330,996,000				3,342,062,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	11,046,000		8,000
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Utility Money Pool	0
Maximum Loans to Utility Money Pool	185,121,000
Average Borrowings from Utility Money Pool	0
Average Loans to Utility Money Pool	115,109,000
Net Loans (Borrowings) to/from Utility Money Pool	152,148,000
Authorized Short-term Borrowing Limit	600,000,000
Maximum and Minimum Interest Rates
Maximum Interest Rate	0.59%		0.33%
Minimum Interest Rate	0.39%		0.28%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
Average Interest Rate for Funds Borrowed	0.00%		0.00%
Average Interest Rate for Funds Loaned	0.45%		0.31%
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues	164,414,000				159,823,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	2,454,000		2,423,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit	429,624,000		437,196,000
Financing Activities (Textuals) [Abstract]
Maximum Percentage Debt to Capitalization	67.50%
Appalachian Power Co [Member] | Land Note [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	9,000
Interest Rate (Percentage)	13.718%
Due Date	2026
Appalachian Power Co [Member] | Notes Payable Affiliated [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments				86,000,000
Interest Rate (Percentage)				3.125%
Due Date				2015
Appalachian Power Co [Member] | Pollution Control Bonds [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances				86,000,000
Interest Rate (Percentage)				1.90%
Due Date				2019
Appalachian Power Co [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	11,037,000
Interest Rate (Percentage)	2.008%
Due Date	2024
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding	2,001,609,000				2,027,397,000
Long-term Debt Due Within One Year	374,347,000				382,187,000
Long-term Debt	1,627,262,000				1,645,210,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	25,937,000		26,337,000
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Utility Money Pool	200,032,000
Maximum Loans to Utility Money Pool	13,514,000
Average Borrowings from Utility Money Pool	149,526,000
Average Loans to Utility Money Pool	13,496,000
Net Loans (Borrowings) to/from Utility Money Pool	(154,653,000)
Authorized Short-term Borrowing Limit	500,000,000
Maximum and Minimum Interest Rates
Maximum Interest Rate	0.59%		0.33%
Minimum Interest Rate	0.39%		0.28%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
Average Interest Rate for Funds Borrowed	0.46%		0.00%
Average Interest Rate for Funds Loaned	0.46%		0.31%
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues	152,843,000				137,459,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	2,357,000		2,040,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit	419,560,000		407,150,000
Financing Activities (Textuals) [Abstract]
Reacquired Pollution Controls Bonds Held by Trustees	40,000,000
Maximum Percentage Debt to Capitalization	67.50%
Indiana Michigan Power Co [Member] | Notes Payable Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	6,943,000
Interest Rate (Variable)	Variable
Due Date	2017
Indiana Michigan Power Co [Member] | Notes Payable Three [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	6,600,000
Interest Rate (Variable)	Variable
Due Date	2019
Indiana Michigan Power Co [Member] | Notes Payable Four [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	429,000
Interest Rate (Variable)	Variable
Due Date	2016
Indiana Michigan Power Co [Member] | Notes Payable Five [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	297,000
Interest Rate (Percentage)	2.12%
Due Date	2016
Indiana Michigan Power Co [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	2,750,000
Interest Rate (Variable)	Variable
Due Date	2015
Indiana Michigan Power Co [Member] | Other Long Term Debt Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	275,000
Interest Rate (Percentage)	6.00%
Due Date	2025
Indiana Michigan Power Co [Member] | Notes Payable [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	8,643,000
Interest Rate (Variable)	Variable
Due Date	2016
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding	2,275,041,000				2,297,123,000
Long-term Debt Due Within One Year	132,044,000				131,497,000
Long-term Debt	2,142,997,000				2,165,626,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	22,219,000		225,029,000
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Utility Money Pool	0
Maximum Loans to Utility Money Pool	367,472,000
Average Borrowings from Utility Money Pool	0
Average Loans to Utility Money Pool	301,505,000
Net Loans (Borrowings) to/from Utility Money Pool	291,256,000
Authorized Short-term Borrowing Limit	400,000,000
Maximum and Minimum Interest Rates
Maximum Interest Rate	0.59%		0.33%
Minimum Interest Rate	0.39%		0.28%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
Average Interest Rate for Funds Borrowed	0.00%		0.31%
Average Interest Rate for Funds Loaned	0.46%		0.29%
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues	383,572,000				365,834,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	8,015,000		7,498,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit	714,985,000		686,627,000
Financing Activities (Textuals) [Abstract]
Reacquired Pollution Controls Bonds Held by Trustees	345,000,000
Ohio Power Co [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	19,000
Interest Rate (Percentage)	1.149%
Due Date	2028
Ohio Power Co [Member] | Pollution Control Bonds [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments				86,000,000
Interest Rate (Percentage)				3.125%
Due Date				2015
Ohio Power Co [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	22,200,000
Interest Rate (Percentage)	0.958%
Due Date	2018
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding	1,291,015,000				1,041,036,000
Long-term Debt Due Within One Year	430,000				427,000
Long-term Debt	1,290,585,000				1,040,609,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	106,000		102,000
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Utility Money Pool	165,947,000
Maximum Loans to Utility Money Pool	62,255,000
Average Borrowings from Utility Money Pool	113,117,000
Average Loans to Utility Money Pool	16,812,000
Net Loans (Borrowings) to/from Utility Money Pool	62,255,000
Authorized Short-term Borrowing Limit	300,000,000
Maximum and Minimum Interest Rates
Maximum Interest Rate	0.59%		0.33%
Minimum Interest Rate	0.39%		0.28%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
Average Interest Rate for Funds Borrowed	0.49%		0.31%
Average Interest Rate for Funds Loaned	0.44%		0.00%
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues	110,513,000				112,905,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	1,422,000		1,323,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit	302,501,000		290,217,000
Financing Activities (Textuals) [Abstract]
Maximum Percentage Debt to Capitalization	67.50%
Public Service Co Of Oklahoma [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	106,000
Interest Rate (Percentage)	3.00%
Due Date	2027
Public Service Co Of Oklahoma [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances	125,000,000
Interest Rate (Percentage)	3.17%
Due Date	2025
Public Service Co Of Oklahoma [Member] | Senior Unsecured Notes Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances	125,000,000
Interest Rate (Percentage)	4.09%
Due Date	2045
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding	2,535,361,000				2,140,437,000
Long-term Debt Due Within One Year	253,250,000				306,750,000
Long-term Debt	2,282,111,000				1,833,687,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	55,125,000		1,625,000
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Utility Money Pool	112,481,000
Maximum Loans to Utility Money Pool	293,378,000
Average Borrowings from Utility Money Pool	52,596,000
Average Loans to Utility Money Pool	96,548,000
Net Loans (Borrowings) to/from Utility Money Pool	293,378,000
Authorized Short-term Borrowing Limit	350,000,000
Maximum and Minimum Interest Rates
Maximum Interest Rate	0.59%		0.33%
Minimum Interest Rate	0.39%		0.28%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
Average Interest Rate for Funds Borrowed	0.46%		0.31%
Average Interest Rate for Funds Loaned	0.52%		0.00%
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues	132,161,000				148,668,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	1,722,000		1,566,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit	373,167,000		390,588,000
Financing Activities (Textuals) [Abstract]
Maximum Percentage Debt to Capitalization	67.50%
Southwestern Electric Power Co [Member] | Pollution Control Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances	53,500,000
Interest Rate (Percentage)	1.60%
Due Date	2019
Southwestern Electric Power Co [Member] | Pollution Control Bonds Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	53,500,000
Interest Rate (Percentage)	3.25%
Due Date	2015
Southwestern Electric Power Co [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances	400,000,000
Interest Rate (Percentage)	3.90%
Due Date	2045
Southwestern Electric Power Co [Member] | Senior Unsecured Notes Two [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments				100,000,000
Interest Rate (Percentage)				5.375%
Due Date				2015
Southwestern Electric Power Co [Member] | Notes Payable [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	1,625,000
Interest Rate (Percentage)	4.58%
Due Date	2032
Kentucky Power Co [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances	25,000,000
Interest Rate (Variable)	Variable
Due Date	2018
AEP Texas Central Co [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	78,000,000
Interest Rate (Percentage)	5.09%
Due Date	2015
AEP Texas Central Co [Member] | Securitization Bonds Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Retirements and Principal Payments	42,000,000
Interest Rate (Percentage)	6.25%
Due Date	2016
AEP Transmission Company [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances	50,000,000
Interest Rate (Percentage)	3.66%
Due Date	2025
Transource Missouri [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Issuances	$ 5,000,000
Interest Rate (Variable)	Variable
Due Date	2018

[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 March 31, 2015 and December 31, 2014, 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] Amount of securitized debt for receivables as accounted for under the ''Transfers and Servicing'' accounting guidance

[4] Weighted average rate.