Financing Activities (Details) - USD ($)			3 Months Ended
		Apr. 30, 2024	Mar. 31, 2024		Mar. 31, 2023		Dec. 31, 2023
Long-term Debt
Senior Unsecured Notes			$ 34,606,100,000				$ 33,779,400,000
Pollution Control Bonds			1,771,000,000				1,771,600,000
Notes Payable			163,500,000				193,300,000
Securitization Bonds			343,800,000				368,900,000
Spent Nuclear Fuel Obligation	[1]		304,400,000				300,400,000
Junior Subordinated Notes			1,588,200,000				2,388,100,000
Other Long-term Debt			1,058,900,000				1,341,500,000
Total Long-term Debt Outstanding			39,835,900,000				40,143,200,000
Long-term Debt Due Within One Year			1,198,600,000				2,490,500,000
Long-term Debt			38,637,300,000				37,652,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]		868,000,000.0
Repayments of Long-term Debt			1,162,200,000		$ 519,500,000
Short-term Debt:
Securitized Debt for Receivables	[3]		900,000,000.0				888,000,000.0
Commercial Paper			2,832,200,000				1,937,900,000
Total Short-term Debt			$ 3,737,600,000				$ 2,830,200,000
Securitized Debt for Receivables	[3],[4]		5.54%				5.65%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable			5.61%		4.86%
Net Uncollectible Accounts Receivable Written Off			$ 8,100,000		$ 6,900,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts			1,164,200,000				$ 1,207,400,000
Total Principal Outstanding			900,000,000.0				888,000,000.0
Delinquent Securitized Accounts Receivable			58,200,000				52,200,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable			42,600,000				42,000,000.0
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable			336,900,000				$ 409,800,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			5,025,700,000		4,690,900,000
Financing Activities (Textuals)
Maximum Value of Shares to be Issued Under ATM Program			$ 1,700,000,000
Maximum Percentage Paid to Selling Agents			2.00%
Issuance of Common Stock			$ 40,600,000		41,100,000
Maximum Percentage Debt to Capitalization			67.50%
Total Commitment from Bank Conduits to Finance Receivables			$ 900,000,000
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,			14,800,000		12,500,000
Issuance of Long-term Debt			859,900,000		2,847,300,000
Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Reconciling Adjustments [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	[5]		(526,000,000.0)		(443,700,000)
Vertically Integrated Utilities [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			46,700,000		41,500,000
Transmission And Distribution Utilities [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			7,000,000.0		8,900,000
Generation And Marketing [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			47,600,000		100,000
Other Segments [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	[6]		37,900,000		27,800,000
Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			368,800,000	[7]	327,200,000	[8]
Wholesale Transmission [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(418,600,000)	[7]	(401,800,000)	[8]
Wholesale Transmission [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			488,700,000	[7]	450,100,000	[8]
Wholesale Transmission [Member] | AEP Transmission Holdco [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			387,000,000		357,000,000
Wholesale Transmission [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			118,900,000	[7]	114,700,000	[8]
Wholesale Transmission [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			179,800,000	[7]	164,200,000	[8]
Wholesale Transmission [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[7]	0	[8]
Wholesale Transmission [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[7]	0	[8]
Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			111,800,000	[9]	65,300,000	[10]
Other Revenues [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(68,700,000)	[9]	(43,700,000)	[10]
Other Revenues [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			8,100,000	[9]	3,600,000	[10]
Other Revenues [Member] | Corporate and Other | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			48,000,000		29,000,000
Other Revenues [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			59,700,000	[9]	32,600,000	[10]
Other Revenues [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			51,000,000.0	[9]	42,800,000	[10]
Other Revenues [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,300,000	[9]	600,000	[10]
Other Revenues [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			60,400,000	[9]	29,400,000	[10]
Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			263,400,000		215,200,000
Wholesale Generation [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			100,000		0
Wholesale Generation [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Wholesale Generation [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			235,900,000		182,800,000
Wholesale Generation [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Wholesale Generation [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			27,400,000		32,400,000
Wholesale Generation [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,916,100,000		1,827,200,000
Residential [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Residential [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Residential [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,212,300,000		1,170,400,000
Residential [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			703,800,000		656,800,000
Residential [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Residential [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,042,100,000		1,009,300,000
Commercial [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Commercial [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Commercial [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			645,100,000		633,400,000
Commercial [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			397,000,000.0		375,900,000
Commercial [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Commercial [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			783,000,000.0	[11]	883,000,000.0
Industrial [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(200,000)	[11]	(200,000)
Industrial [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[11]	0
Industrial [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			647,100,000	[11]	670,300,000
Industrial [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			136,100,000	[11]	212,900,000
Industrial [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[11]	0
Industrial [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[11]	0
Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			69,200,000		68,900,000
Other Retail [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Other Retail [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Other Retail [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			55,300,000		56,800,000
Other Retail [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			13,900,000		12,100,000
Other Retail [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Other Retail [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			3,810,400,000		3,788,400,000
Retail [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(200,000)		(200,000)
Retail [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Retail [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,559,800,000		2,530,900,000
Retail [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,250,800,000		1,257,700,000
Retail [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Retail [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
Renewable Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			4,900,000	[11]	21,200,000	[12]
Renewable Generation [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(1,400,000)	[11]	(100,000)	[12]
Renewable Generation [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[11]	0	[12]
Renewable Generation [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[11]	0	[12]
Renewable Generation [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[11]	0	[12]
Renewable Generation [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			6,300,000	[11]	21,300,000	[12]
Renewable Generation [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[11]	0	[12]
Retail, Trading and Marketing Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			525,700,000	[13]	413,500,000	[12]
Retail, Trading and Marketing Revenues [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(46,200,000)	[13]	100,000	[12]
Retail, Trading and Marketing Revenues [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[13]	0	[12]
Retail, Trading and Marketing Revenues [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[13]	0	[12]
Retail, Trading and Marketing Revenues [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[13]	0	[12]
Retail, Trading and Marketing Revenues [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			571,400,000	[13]	413,700,000	[12]
Retail, Trading and Marketing Revenues [Member] | Generation And Marketing [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			46,000,000
Retail, Trading and Marketing Revenues [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			500,000	[13]	(300,000)	[12]
Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,162,800,000		977,100,000
Wholesale and Competitive [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(466,100,000)		(401,800,000)
Wholesale and Competitive [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			488,700,000		450,100,000
Wholesale and Competitive [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			354,800,000		297,500,000
Wholesale and Competitive [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			179,800,000		164,200,000
Wholesale and Competitive [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			605,100,000		467,400,000
Wholesale and Competitive [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			500,000		(300,000)
Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			5,085,000,000		4,830,800,000
Affiliated and Nonaffiliated [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(535,000,000.0)		(445,700,000)
Affiliated and Nonaffiliated [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			496,800,000		453,700,000
Affiliated and Nonaffiliated [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,974,300,000		2,861,000,000
Affiliated and Nonaffiliated [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,481,600,000		1,464,700,000
Affiliated and Nonaffiliated [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			606,400,000		468,000,000.0
Affiliated and Nonaffiliated [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			60,900,000		29,100,000
Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			125,400,000		92,400,000
Other Revenues [Member] | Other Segments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	[6]		14,900,000		2,300,000
Junior Subordinated Notes
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 805,000,000.0
Due Date			2024
Interest Rate (Percentage)			2.03%
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	[4]		5.61%				5.69%
AEP Texas Inc. [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 5,878,700,000				$ 5,889,800,000
Long-term Debt Due Within One Year			96,200,000				96,000,000.0
Long-term Debt			5,782,500,000				5,793,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 11,900,000		136,700,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization			67.50%
AEP Texas Inc. [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			$ 267,900,000				103,700,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,300,000		1,200,000
Financing Activities (Textuals)
Net Loans To Money Pool			7,000,000.0				7,100,000
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			155,900,000	[14]	146,300,000	[15]
AEP Texas Inc. [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			8,800,000	[16]	9,700,000	[17]
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[18]	0	[19]
AEP Texas Inc. [Member] | Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			147,300,000		130,700,000
AEP Texas Inc. [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			110,900,000		97,300,000
AEP Texas Inc. [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			35,600,000	[20]	39,300,000
AEP Texas Inc. [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			9,700,000		8,300,000
AEP Texas Inc. [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			303,500,000		275,600,000
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			155,900,000		146,300,000
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			468,200,000		431,600,000
AEP Texas Inc. [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 2,100,000		$ 600,000
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate			5.79%		5.42%
Minimum Interest Rate			5.66%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 267,900,000
Maximum Loans to Money Pool			0
Average Borrowings from Money Pool			191,200,000
Average Loans to Money Pool			0
Authorized Short Term Borrowing Limit			$ 600,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			5.71%		5.18%
Average Interest Rate For Funds Loaned			0.00%		0.00%
AEP Texas Inc. [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			$ (267,900,000)
AEP Texas Inc. [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool			7,100,000
Average Loans to Money Pool			$ 7,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned			5.79%		5.42%
Minimum Interest Rate for Funds Loaned			5.66%		4.66%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned			5.72%		5.12%
AEP Texas Inc. [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 7,000,000.0
AEP Texas Inc. [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 11,900,000
Due Date			2025
Interest Rate (Percentage)			2.06%
AEP Transmission Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 5,860,700,000				5,414,400,000
Long-term Debt Due Within One Year			145,000,000.0				95,000,000.0
Long-term Debt			5,715,700,000				5,319,400,000
Financing Activities (Textuals)
Sub-Limit of Secured Debt			$ 50,000,000
Maximum Percentage of Consolidated Tangible Net Assets			10.00%
Tangible Capital to Tangible Assets			0.20%
Maximum Percentage Debt to Capitalization			67.50%
Issuance of Long-term Debt			$ 446,100,000		$ 689,200,000
AEP Transmission Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			28,800,000				174,300,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			389,400,000		357,400,000
Financing Activities (Textuals)
Net Loans To Money Pool			298,000,000.0				67,100,000
AEP Transmission Co [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
AEP Transmission Co [Member] | Reconciling Adjustments [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			475,400,000	[14]	438,700,000	[15]
AEP Transmission Co [Member] | Wholesale Transmission [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			384,000,000		349,000,000
AEP Transmission Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			8,100,000	[16]	3,700,000	[17]
AEP Transmission Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[18]	0	[19]
AEP Transmission Co [Member] | Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
AEP Transmission Co [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
AEP Transmission Co [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[20]	0
AEP Transmission Co [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
AEP Transmission Co [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0		0
AEP Transmission Co [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			475,400,000		438,700,000
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			483,500,000		442,400,000
AEP Transmission Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,400,000		$ 0
AEP Transmission Co [Member] | Other Revenues [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 0
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate			5.79%		5.42%
Minimum Interest Rate			5.66%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 313,300,000
Maximum Loans to Money Pool			298,000,000.0
Average Borrowings from Money Pool			178,500,000
Average Loans to Money Pool			75,300,000
Authorized Short Term Borrowing Limit	[21]		$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			5.72%		5.09%
Average Interest Rate For Funds Loaned			5.70%		5.29%
AEP Transmission Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 272,900,000
AEP Transmission Co [Member] | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			44,400,000
Maximum Loans to Money Pool			148,500,000
Average Borrowings from Money Pool			4,400,000
Average Loans to Money Pool			72,900,000
Borrowings from Parent			3,700,000
Loans to Parent			0
Authorized Short Term Borrowing Limit	[22]		$ 50,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed			5.79%		5.38%
Minimum Interest Rate For Funds Borrowed			5.66%		4.53%
Maximum Interest Rate For Funds Loaned			5.79%		5.38%
Minimum Interest Rate for Funds Loaned			5.66%		4.53%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			5.74%		5.03%
Average Interest Rate For Funds Loaned			5.71%		5.15%
AEP Transmission Co [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]		$ 450,000,000.0
Due Date			2034
Interest Rate (Percentage)			5.15%
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 5,670,900,000				5,588,300,000
Long-term Debt Due Within One Year			153,300,000				538,800,000
Long-term Debt			5,517,600,000				5,049,500,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			313,400,000		$ 13,000,000.0
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			196,500,000				184,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			$ 536,000,000.0		506,200,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization			67.50%
Issuance of Long-term Debt			$ 395,800,000		0
Appalachian Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			0				339,600,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			63,100,000		69,600,000
Financing Activities (Textuals)
Net Loans To Money Pool			37,400,000				18,900,000
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			47,100,000	[14]	41,400,000	[15]
Appalachian Power Co [Member] | Wholesale Transmission [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			21,000,000
Appalachian Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			21,700,000	[16]	13,000,000.0	[17]
Appalachian Power Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			85,100,000	[18]	80,200,000	[19]
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			41,000,000		47,000,000
Appalachian Power Co [Member] | Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			526,300,000		470,500,000
Appalachian Power Co [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			188,300,000		171,300,000
Appalachian Power Co [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			196,400,000	[20]	185,800,000
Appalachian Power Co [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			28,100,000		26,200,000
Appalachian Power Co [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			939,100,000		853,800,000
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			132,200,000		121,600,000
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,093,000,000		988,400,000
Appalachian Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			5,600,000		3,600,000
Appalachian Power Co [Member] | Other Long Term Debt Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 300,000,000.0
Due Date			2024
Interest Rate (Variable)			Variable
Appalachian Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 4,200,000		$ 4,900,000
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate			5.79%		5.42%
Minimum Interest Rate			5.66%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 399,500,000
Maximum Loans to Money Pool			51,100,000
Average Borrowings from Money Pool			205,500,000
Average Loans to Money Pool			20,300,000
Authorized Short Term Borrowing Limit			$ 750,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			5.74%		5.14%
Average Interest Rate For Funds Loaned			5.72%		5.12%
Appalachian Power Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 37,400,000
Appalachian Power Co [Member] | Pollution Control Bond [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		$ 86,000,000
Appalachian Power Co [Member] | Securitization Bonds Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 13,400,000
Due Date			2028
Interest Rate (Percentage)			3.77%
Appalachian Power Co [Member] | Senior Unsecured Notes Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]		$ 400,000,000.0
Due Date			2034
Interest Rate (Percentage)			5.65%
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,478,500,000				3,499,400,000
Long-term Debt Due Within One Year			76,900,000				83,700,000
Long-term Debt			3,401,600,000				3,415,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			25,400,000		$ 274,300,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			167,000,000.0				156,400,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			529,700,000		525,400,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition			$ 355,000,000				348,000,000
Maximum Percentage Debt to Capitalization			67.50%
Issuance of Long-term Debt			$ 0		499,800,000
Indiana Michigan Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			73,200,000				63,300,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,800,000		1,200,000
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			10,100,000	[14]	8,100,000	[15]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			27,600,000	[16]	21,400,000	[17]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			18,000,000		18,000,000
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			137,300,000	[18]	104,000,000.0	[19]
Indiana Michigan Power Co [Member] | Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			224,800,000		239,600,000
Indiana Michigan Power Co [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			144,800,000		138,900,000
Indiana Michigan Power Co [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			147,900,000	[20]	152,600,000
Indiana Michigan Power Co [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,300,000		1,300,000
Indiana Michigan Power Co [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			518,800,000		532,400,000
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			147,400,000		112,100,000
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			693,800,000		665,900,000
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,800,000		3,100,000
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			15,000,000.0		15,900,000
Indiana Michigan Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 4,100,000		$ 3,900,000
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate			5.79%		5.42%
Minimum Interest Rate			5.66%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 125,500,000
Maximum Loans to Money Pool			0
Average Borrowings from Money Pool			60,200,000
Average Loans to Money Pool			0
Authorized Short Term Borrowing Limit			$ 500,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			5.73%		5.12%
Average Interest Rate For Funds Loaned			0.00%		5.16%
Indiana Michigan Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			$ (73,200,000)
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Four [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 5,000,000.0
Due Date			2026
Interest Rate (Percentage)			3.44%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Five [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 6,800,000
Due Date			2027
Interest Rate (Percentage)			5.93%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Six [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 6,800,000
Due Date			2028
Interest Rate (Percentage)			6.01%
Indiana Michigan Power Co [Member] | OtherLongTermDebtThree
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 700,000
Due Date			2025
Interest Rate (Percentage)			6.00%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Nine | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt		80,000,000
Repayments of Long-term Debt		$ 8,000,000
Due Date		2028
Interest Rate (Percentage)		6.41%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 1,200,000
Due Date			2024
Interest Rate (Variable)			Variable
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 900,000
Due Date			2025
Interest Rate (Variable)			Variable
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Three [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 4,000,000.0
Due Date			2025
Interest Rate (Percentage)			0.93%
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,367,400,000				3,366,800,000
Long-term Debt			3,367,400,000				3,366,800,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			536,000,000.0				541,700,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			845,700,000		$ 884,400,000
Ohio Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			295,200,000				110,500,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			5,700,000		7,600,000
Ohio Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			23,800,000	[14]	17,900,000	[15]
Ohio Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			42,200,000	[16]	33,200,000	[17]
Ohio Power Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[18]	0	[19]
Ohio Power Co [Member] | Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			556,500,000		526,000,000.0
Ohio Power Co [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			286,100,000		278,500,000
Ohio Power Co [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			100,500,000	[20]	173,600,000
Ohio Power Co [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			4,200,000		3,800,000
Ohio Power Co [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			947,300,000		981,900,000
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			23,800,000		17,900,000
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,013,300,000		1,033,000,000
Ohio Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,700,000		5,200,000
Ohio Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 7,400,000		$ 7,300,000
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate			5.79%		5.42%
Minimum Interest Rate			5.66%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 295,200,000
Maximum Loans to Money Pool			0
Average Borrowings from Money Pool			143,400,000
Average Loans to Money Pool			0
Authorized Short Term Borrowing Limit			$ 500,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			5.71%		5.17%
Average Interest Rate For Funds Loaned			0.00%		0.00%
Ohio Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			$ (295,200,000)
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding			2,384,900,000				2,384,600,000
Long-term Debt Due Within One Year			125,600,000				600,000
Long-term Debt			2,259,300,000				2,384,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			100,000		$ 100,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			96,300,000				134,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			$ 361,600,000		416,300,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization			67.50%
Issuance of Long-term Debt			$ 0		469,900,000
Public Service Co Of Oklahoma [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			264,600,000				54,400,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			3,500,000		700,000
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			10,800,000	[14]	11,300,000	[15]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			12,000,000.0	[16]	2,300,000	[17]
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,200,000	[18]	900,000	[19]
Public Service Co Of Oklahoma [Member] | Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			158,200,000		170,900,000
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			103,000,000.0		109,100,000
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			80,300,000	[20]	98,300,000
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			21,500,000		24,200,000
Public Service Co Of Oklahoma [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			363,000,000.0		402,500,000
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			13,000,000.0		12,200,000
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			388,000,000.0		417,000,000.0
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			6,200,000		1,500,000
Public Service Co Of Oklahoma [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 3,400,000		$ 3,200,000
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate			5.79%		5.42%
Minimum Interest Rate			5.66%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 264,600,000
Maximum Loans to Money Pool			0
Average Borrowings from Money Pool			128,800,000
Average Loans to Money Pool			0
Authorized Short Term Borrowing Limit			$ 750,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			5.71%		4.84%
Average Interest Rate For Funds Loaned			0.00%		5.11%
Public Service Co Of Oklahoma [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			$ (264,600,000)
Public Service Co Of Oklahoma [Member] | OtherLongTermDebtFour
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 100,000
Due Date			2027
Interest Rate (Percentage)			3.00%
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,647,600,000				3,646,900,000
Long-term Debt			3,647,600,000				3,646,900,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			0		$ 94,100,000
Short-term Debt:
Notes Payable			5,400,000				4,300,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			144,200,000				168,300,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			$ 425,400,000		437,600,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization			67.50%
Issuance of Long-term Debt			$ 0		347,300,000
Southwestern Electric Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			254,500,000				88,700,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			12,100,000		11,700,000
Financing Activities (Textuals)
Net Loans To Money Pool			2,300,000				$ 2,200,000
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			39,600,000	[14]	42,900,000	[15]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			14,000,000
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			9,600,000	[16]	7,900,000	[17]
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			47,100,000	[18]	39,600,000	[19]
Southwestern Electric Power Co [Member] | Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			182,400,000		175,900,000
Southwestern Electric Power Co [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			140,000,000.0		143,500,000
Southwestern Electric Power Co [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			95,000,000.0	[20]	104,200,000
Southwestern Electric Power Co [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,600,000		2,600,000
Southwestern Electric Power Co [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			420,000,000.0		426,200,000
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			86,700,000		82,500,000
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			516,300,000		516,600,000
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			3,900,000		500,000
Southwestern Electric Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 4,800,000		$ 4,300,000
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate			5.79%		5.42%
Minimum Interest Rate			5.66%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 254,500,000
Maximum Loans to Money Pool			0
Average Borrowings from Money Pool			161,100,000
Average Loans to Money Pool			0
Authorized Short Term Borrowing Limit			$ 750,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			5.71%		5.12%
Average Interest Rate For Funds Loaned			0.00%		0.00%
Southwestern Electric Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool			$ (254,500,000)
Southwestern Electric Power Co [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool			2,300,000
Average Loans to Money Pool			$ 2,200,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned			5.79%		5.42%
Minimum Interest Rate for Funds Loaned			5.66%		4.66%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned			5.72%		5.13%
Southwestern Electric Power Co [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 2,300,000
Southwestern Electric Power Co [Member] | Loans Payable [Member]
Short-term Debt:
Weighted Average Interest Rate	[4]		7.68%				7.71%
Transource Energy [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]		$ 18,000,000.0
Due Date			2025
Interest Rate (Variable)			Variable
Transource Energy [Member] | Senior Unsecured Notes Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 1,400,000
Due Date			2050
Interest Rate (Percentage)			2.75%
Wheeling Power Company | Notes Payable, Other Payable Eight [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt		$ 450,000,000
Due Date		2034
Interest Rate (Percentage)		6.89%
Wheeling Power Company | Other Long Term Debt Five | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		$ 265,000,000
AEP Generating Company | Notes Payable, Other Payable Seven [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 5,000,000.0
Due Date			2028
Interest Rate (Percentage)			2.43%
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,			$ 14,800,000		$ 12,700,000

[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 SNF 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 $355 million and $348 million as of March 31, 2024 and December 31, 2023, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on the balance sheets.

[2] 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.

[3] Amount of securitized debt for receivables as accounted for under the “Transfers and Servicing” accounting guidance.

[4] Weighted-average rate as of March 31, 2024 and December 31, 2023, respectively.

[5] Represents inter-segment revenues.

[6] Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income, interest expense and other nonallocated costs.

[7] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $387 million. The remaining affiliated amounts were immaterial.

[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $357 million. The remaining affiliated amounts were immaterial.

[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $48 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $29 million. The remaining affiliated amounts were immaterial.

[11] Amounts include affiliated and nonaffiliated revenues.

[12] Amounts include affiliated and nonaffiliated revenues

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $46 million. The remaining affiliated amounts were immaterial.

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $384 million, APCo was $21 million and SWEPCo was $14 million. The remaining affiliated amounts were immaterial.

[15] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $349 million. The remaining affiliated amounts were immaterial.

[16] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $18 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[17] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $18 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[18] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $41 million primarily related to the PPA with KGPCo.

[19] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $47 million primarily related to the PPA with KGPCo.

[20] Amounts include affiliated and nonaffiliated revenues.

[21] (a)    Amount represents the combined authorized short-term borrowing limit the State Transcos have from FERC or state regulatory commissions.

[22] (a)    Amount represents the authorized short-term borrowing limit from FERC or state regulatory agencies not otherwise included in the utility money pool above.