Financing Activities (Details) - USD ($)			3 Months Ended						6 Months Ended
		Jul. 30, 2024	Jun. 30, 2024		Mar. 31, 2024	Jun. 30, 2023		Mar. 31, 2023	Jun. 30, 2024		Jun. 30, 2023		Dec. 31, 2023
Long-term Debt
Senior Unsecured Notes			$ 35,817,600,000						$ 35,817,600,000				$ 33,779,400,000
Pollution Control Bonds			1,771,800,000						1,771,800,000				1,771,600,000
Notes Payable			671,300,000						671,300,000				193,300,000
Securitization Bonds			311,500,000						311,500,000				368,900,000
Spent Nuclear Fuel Obligation	[1]		308,500,000						308,500,000				300,400,000
Junior Subordinated Notes			2,576,700,000						2,576,700,000				2,388,100,000
Other Long-term Debt			604,900,000						604,900,000				1,341,500,000
Total Long-term Debt Outstanding			42,062,300,000						42,062,300,000				40,143,200,000
Long-term Debt Due Within One Year			2,071,900,000						2,071,900,000				2,490,500,000
Long-term Debt			39,990,400,000						39,990,400,000				37,652,700,000
Liabilities Held for Sale			12,500,000						12,500,000				0
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]								3,698,400,000
Repayments of Long-term Debt									1,769,100,000		$ 641,700,000
Short-term Debt:
Securitized Debt for Receivables	[3]		900,000,000.0						900,000,000.0				888,000,000.0
Commercial Paper			776,000,000.0						776,000,000.0				1,937,900,000
Total Short-term Debt			$ 1,681,700,000						$ 1,681,700,000				$ 2,830,200,000
Securitized Debt for Receivables	[3],[4]		5.51%						5.51%				5.65%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable			5.51%			5.25%			5.56%		5.06%
Net Uncollectible Accounts Receivable Written Off			$ 5,800,000			$ 7,300,000			$ 13,900,000		$ 14,100,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts			1,231,900,000						1,231,900,000				$ 1,207,400,000
Total Principal Outstanding			900,000,000.0						900,000,000.0				888,000,000.0
Delinquent Securitized Accounts Receivable			56,500,000						56,500,000				52,200,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable			44,700,000						44,700,000				42,000,000.0
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable			392,600,000						392,600,000				409,800,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			4,579,200,000			4,372,500,000			9,604,900,000		9,063,400,000
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%
Stock Issued During Period, Shares, New Issues									4,437,136
Issuance of Common Stock									$ 475,800,000		77,600,000
Maximum Percentage Debt to Capitalization									67.50%
Total Commitment from Bank Conduits to Finance Receivables			900,000,000						$ 900,000,000
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,			(1,100,000)		$ 14,800,000	(3,300,000)		$ 12,500,000
Assets Held for Sale			353,200,000						353,200,000				$ 0
Issuance of Long-term Debt									3,663,300,000		3,958,800,000
Fixed Performance Obligations			324,000,000.0						324,000,000.0
Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0			0			0		0
2024 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			46,200,000						46,200,000
2025-2026[Member]
Financing Activities (Textuals)
Fixed Performance Obligations			168,300,000						168,300,000
2027-2028 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			84,800,000						84,800,000
After 2028
Financing Activities (Textuals)
Fixed Performance Obligations			24,700,000						24,700,000
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			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]		(490,800,000)			(464,200,000)			(1,016,800,000)		(907,900,000)
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			47,000,000.0			45,500,000			93,700,000		87,000,000.0
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			7,100,000			9,400,000			14,100,000		18,300,000
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			25,000,000.0			13,200,000			72,600,000		13,300,000
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]		30,500,000			25,800,000			68,400,000		53,600,000
Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			430,900,000	[7]		350,600,000	[8]		799,700,000	[9]	677,800,000	[10]
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			(397,000,000.0)	[7]		(402,800,000)	[8]		(815,600,000)	[9]	(804,600,000)	[10]
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			496,600,000	[7]		455,800,000	[8]		985,300,000	[9]	905,900,000	[10]
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			393,000,000			360,000,000			780,000,000		712,000,000
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			123,000,000.0	[7]		113,500,000	[8]		241,900,000	[9]	228,200,000	[10]
Wholesale Transmission [Member] | 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			41,000,000						83,000,000		80,000,000
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			208,300,000	[7]		184,100,000	[8]		388,100,000	[9]	348,300,000	[10]
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]		0	[9]	0	[10]
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]		0	[9]	0	[10]
Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			99,900,000	[11]		117,200,000	[12]		211,700,000	[13]	182,500,000	[14]
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			(48,800,000)	[11]		(39,900,000)	[12]		(117,500,000)	[13]	(83,600,000)	[14]
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			6,200,000	[11]		4,300,000	[12]		14,300,000	[13]	7,900,000	[14]
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			30,000,000			26,000,000
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			47,400,000	[11]		61,900,000	[12]		107,100,000	[13]	94,500,000	[14]
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			38,900,000	[11]		56,100,000	[12]		89,900,000	[13]	98,900,000	[14]
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			1,000,000.0	[11]		6,200,000	[12]		2,300,000	[13]	6,800,000	[14]
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			55,200,000	[11]		28,600,000	[12]		115,600,000	[13]	58,000,000.0	[14]
Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			172,600,000			161,100,000			436,000,000.0		376,300,000	[15]
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)			100,000			0		100,000	[15]
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			0		0	[15]
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			149,000,000.0			141,400,000			384,900,000		324,200,000	[15]
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			0		0	[15]
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			23,700,000			19,600,000			51,100,000		52,000,000.0	[15]
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			0		0	[15]
Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,599,200,000			1,536,100,000			3,515,300,000		3,363,300,000
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			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			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			949,000,000.0			962,000,000.0			2,161,300,000		2,132,400,000
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			650,200,000			574,100,000			1,354,000,000		1,230,900,000
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			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			0		0
Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,040,900,000			1,001,000,000			2,083,000,000		2,010,300,000
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			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			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			649,800,000			642,700,000			1,294,900,000		1,276,100,000
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			391,100,000			358,300,000			788,100,000		734,200,000
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			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			0		0
Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			775,700,000	[16]		850,900,000			1,558,700,000	[17]	1,733,900,000	[15]
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			(100,000)	[16]		(100,000)			(300,000)	[17]	(300,000)	[15]
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	[16]		0			0	[17]	0	[15]
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			652,800,000	[16]		698,900,000			1,299,900,000	[17]	1,369,200,000	[15]
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			123,000,000.0	[16]		152,100,000			259,100,000	[17]	365,000,000.0	[15]
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	[16]		0			0	[17]	0	[15]
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	[16]		0			0	[17]	0	[15]
Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			69,500,000			71,200,000			138,700,000		140,100,000
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			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			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			55,800,000			58,900,000			111,100,000		115,700,000
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			13,700,000			12,300,000			27,600,000		24,400,000
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			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			0		0
Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			3,485,300,000			3,459,200,000			7,295,700,000		7,247,600,000
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			(100,000)			(100,000)			(300,000)		(300,000)
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			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			2,307,400,000			2,362,500,000			4,867,200,000		4,893,400,000
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			1,178,000,000			1,096,800,000			2,428,800,000		2,354,500,000
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			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			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			6,800,000	[16]		30,000,000.0	[18]		11,700,000	[17]	51,200,000	[15]
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)	[16]		(3,100,000)	[18]		(2,800,000)	[17]	(3,200,000)	[15]
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	[16]		0	[18]		0	[17]	0	[15]
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	[16]		0	[18]		0	[17]	0	[15]
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	[16]		0	[18]		0	[17]	0	[15]
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			8,200,000	[16]		33,100,000	[18]		14,500,000	[17]	54,400,000	[15]
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	[16]		0	[18]		0	[17]	0	[15]
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			462,100,000	[19]		398,800,000	[18]		987,800,000	[20]	812,300,000	[21]
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			(23,700,000)	[19]		(10,100,000)	[18]		(69,900,000)	[20]	(10,000,000.0)	[21]
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	[19]		0	[18]		0	[20]	0	[21]
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	[19]		0	[18]		0	[20]	0	[21]
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	[19]		0	[18]		0	[20]	0	[21]
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			485,500,000	[19]		407,700,000	[18]		1,056,900,000	[20]	821,400,000	[21]
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			24,000,000						70,000,000		10,000,000
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			300,000	[19]		1,200,000	[18]		800,000	[20]	900,000	[21]
Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,072,400,000			940,500,000			2,235,200,000		1,917,600,000
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			(422,200,000)			(415,900,000)			(888,300,000)		(817,700,000)
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			496,600,000			455,800,000			985,300,000		905,900,000
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			272,000,000.0			254,900,000			626,800,000		552,400,000
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			208,300,000			184,100,000			388,100,000		348,300,000
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			517,400,000			460,400,000			1,122,500,000		927,800,000
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			300,000			1,200,000			800,000		900,000
Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			4,657,600,000			4,516,900,000			9,742,600,000		9,347,700,000
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			(471,100,000)			(455,900,000)			(1,006,100,000)		(901,600,000)
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			502,800,000			460,100,000			999,600,000		913,800,000
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			2,626,800,000			2,679,300,000			5,601,100,000		5,540,300,000
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			1,425,200,000			1,337,000,000			2,906,800,000		2,801,700,000
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			518,400,000			466,600,000			1,124,800,000		934,600,000
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			55,500,000			29,800,000			116,400,000		58,900,000
Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			135,900,000			94,500,000			261,300,000		186,900,000
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									79,000,000		55,000,000
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]		$ 27,200,000			6,200,000			42,100,000		8,500,000
Equity Distribution Agreement
Financing Activities (Textuals)
Issuance of Common Stock									397,000,000
Junior Subordinated Notes
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]								$ 600,000,000.0
Due Date									2054
Interest Rate (Percentage)			6.95%						6.95%
Junior Subordinates Notes Two
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]								$ 400,000,000.0
Due Date									2054
Interest Rate (Percentage)			7.05%						7.05%
Junior Subordinates Notes Three
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%						2.03%
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	[4]		5.55%						5.55%				5.69%
AEP Texas Inc. [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 6,489,700,000						$ 6,489,700,000				$ 5,889,800,000
Long-term Debt Due Within One Year			63,600,000						63,600,000				96,000,000.0
Long-term Debt			6,426,100,000						6,426,100,000				5,793,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 244,500,000		168,200,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization									67.50%
Issuance of Long-term Debt									$ 841,900,000		445,900,000
AEP Texas Inc. [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			0						0				103,700,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,400,000			1,300,000			2,700,000		2,500,000
Financing Activities (Textuals)
Net Loans To Money Pool			258,200,000						258,200,000				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			184,800,000	[22]		163,100,000	[23]		340,700,000	[24]	309,400,000	[25]
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			10,400,000	[26]		10,700,000	[27]		19,200,000	[28]	20,400,000	[29]
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	[30]		0	[31]		0	[32]	0	[33]
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			184,900,000			144,900,000			332,200,000		275,600,000
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			115,000,000.0			100,600,000			225,900,000		197,900,000
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			34,000,000.0	[34]		35,200,000			69,600,000	[35]	74,500,000	[36]
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			9,300,000			8,700,000			19,000,000.0		17,000,000.0
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			343,200,000			289,400,000			646,700,000		565,000,000.0
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			184,800,000			163,100,000			340,700,000		309,400,000
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			538,400,000			463,200,000			1,006,600,000		894,800,000
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			500,000			500,000			$ 2,600,000		$ 1,100,000
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate									5.79%		5.69%
Minimum Interest Rate									5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool									$ 374,600,000
Maximum Loans to Money Pool									274,300,000
Average Borrowings from Money Pool									237,000,000.0
Average Loans to Money Pool									258,300,000
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									5.70%		5.35%
Average Interest Rate For Funds Loaned									5.49%		0.00%
AEP Texas Inc. [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			251,200,000						$ 251,200,000
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%		5.69%
Minimum Interest Rate for Funds Loaned									5.56%		4.66%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned									5.69%		5.35%
AEP Texas Inc. [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 7,000,000.0						$ 7,000,000.0
AEP Texas Inc. [Member] | Other Long Term Debt Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 200,000,000.0
Due Date									2025
Interest Rate (Variable)									Variable
AEP Texas Inc. [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 32,600,000
Due Date									2024
Interest Rate (Percentage)			2.85%						2.85%
AEP Texas Inc. [Member] | Securitization Bonds Two [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%						2.06%
AEP Texas Inc. [Member] | Senior Unsecured Notes Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]								$ 500,000,000.0
Due Date									2029
Interest Rate (Percentage)			5.45%						5.45%
AEP Texas Inc. [Member] | Senior Unsecured Notes Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]								$ 350,000,000.0
Due Date									2034
Interest Rate (Percentage)			5.70%						5.70%
AEP Transmission Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 5,861,500,000						$ 5,861,500,000				5,414,400,000
Long-term Debt Due Within One Year			185,000,000.0						185,000,000.0				95,000,000.0
Long-term Debt			5,676,500,000						5,676,500,000				5,319,400,000
Financing Activities (Textuals)
Sub-Limit of Secured Debt			$ 50,000,000						$ 50,000,000
Maximum Percentage of Consolidated Tangible Net Assets			10.00%						10.00%
Tangible Capital to Tangible Assets			0.30%						0.30%
Maximum Percentage Debt to Capitalization									67.50%
Issuance of Long-term Debt									$ 445,700,000		$ 689,100,000
AEP Transmission Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			$ 46,500,000						46,500,000				174,300,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			394,400,000			365,800,000			783,800,000		723,200,000
Financing Activities (Textuals)
Net Loans To Money Pool			275,200,000						275,200,000				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			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			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			483,200,000	[22]		444,700,000	[23]		958,600,000	[24]	883,400,000	[25]
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			389,000,000			357,000,000			773,000,000		706,000,000
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			6,200,000	[26]		4,100,000	[27]		14,300,000	[28]	7,800,000	[29]
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	[30]		0	[31]		0	[32]	0	[33]
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			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			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	[34]		0			0	[35]	0	[36]
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			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			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			483,200,000			444,700,000			958,600,000		883,400,000
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			489,400,000			448,800,000			972,900,000		891,200,000
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			400,000			0			2,800,000		$ 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						$ 0
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate									5.79%		5.69%
Minimum Interest Rate									5.14%		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									332,000,000.0
Average Borrowings from Money Pool									102,200,000
Average Loans to Money Pool									161,200,000
Authorized Short Term Borrowing Limit	[37]								$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed									5.71%		5.16%
Average Interest Rate For Funds Loaned									5.62%		5.46%
AEP Transmission Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			258,900,000						$ 258,900,000
AEP Transmission Co [Member] | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool									51,200,000
Maximum Loans to Money Pool									148,500,000
Average Borrowings from Money Pool									5,000,000.0
Average Loans to Money Pool									72,100,000
Borrowings from Parent			30,200,000						30,200,000
Loans to Parent			$ 0						0
Authorized Short Term Borrowing Limit	[38]								$ 50,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed									5.79%		5.69%
Minimum Interest Rate For Funds Borrowed									5.55%		4.53%
Maximum Interest Rate For Funds Loaned									5.79%		5.69%
Minimum Interest Rate for Funds Loaned									5.55%		4.53%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed									5.68%		5.27%
Average Interest Rate For Funds Loaned									5.68%		5.35%
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%						5.15%
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 5,672,000,000						$ 5,672,000,000				5,588,300,000
Long-term Debt Due Within One Year			682,700,000						682,700,000				538,800,000
Long-term Debt			4,989,300,000						4,989,300,000				5,049,500,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									399,500,000		$ 13,000,000.0
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			183,900,000						183,900,000				184,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			447,300,000			414,900,000			$ 983,300,000		921,100,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization									67.50%
Issuance of Long-term Debt									$ 480,800,000		200,000,000.0
Fixed Performance Obligations			77,100,000						77,100,000
Appalachian Power Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			0						0				339,600,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			54,800,000			61,100,000			117,900,000		130,700,000
Financing Activities (Textuals)
Net Loans To Money Pool			42,500,000						42,500,000				18,900,000
Appalachian Power Co [Member] | 2024 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			8,000,000.0						8,000,000.0
Appalachian Power Co [Member] | 2025-2026[Member]
Financing Activities (Textuals)
Fixed Performance Obligations			32,100,000						32,100,000
Appalachian Power Co [Member] | 2027-2028 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			25,400,000						25,400,000
Appalachian Power Co [Member] | After 2028
Financing Activities (Textuals)
Fixed Performance Obligations			11,600,000						11,600,000
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			45,600,000	[22]		43,900,000	[23]		92,700,000	[24]	85,300,000	[25]
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			22,000,000						43,000,000
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			13,100,000	[26]		11,800,000	[27]		34,800,000	[28]	24,800,000	[29]
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			72,100,000	[30]		64,200,000	[31]		157,200,000	[32]	144,400,000	[33]
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			36,000,000			38,000,000			77,000,000		85,000,000
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			364,800,000			324,800,000			891,100,000		795,300,000
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			187,100,000			163,600,000			375,400,000		334,900,000
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			205,900,000	[34]		192,500,000			402,300,000	[35]	378,300,000	[36]
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			25,200,000			56,200,000		51,400,000
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			785,900,000			706,100,000			1,725,000,000		1,559,900,000
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			117,700,000			108,100,000			249,900,000		229,700,000
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			916,700,000			826,000,000.0			2,009,700,000		1,814,400,000
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			3,700,000			2,900,000			9,300,000		6,500,000
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			3,900,000			4,300,000			$ 8,100,000		$ 9,200,000
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate									5.79%		5.69%
Minimum Interest Rate									5.14%		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									56,400,000
Average Borrowings from Money Pool									135,800,000
Average Loans to Money Pool									22,900,000
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									5.73%		5.36%
Average Interest Rate For Funds Loaned									5.64%		5.35%
Appalachian Power Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 42,500,000						$ 42,500,000
Appalachian Power Co [Member] | Pollution Control Bond [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]								$ 86,000,000.0
Due Date									2028
Interest Rate (Percentage)			3.38%						3.38%
Appalachian Power Co [Member] | OtherLongTermDebtThree
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] | OtherLongTermDebtFour
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 100,000
Due Date									2026
Interest Rate (Percentage)			13.72%						13.72%
Appalachian Power Co [Member] | Pollution Control Bond Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 86,000,000.0
Due Date									2024
Interest Rate (Percentage)			2.55%						2.55%
Appalachian Power Co [Member] | Senior Unsecured Notes Four
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%						5.65%
Appalachian Power Co [Member] | Securitization Bonds Four
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 (Variable)									3.77
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,540,300,000						$ 3,540,300,000				3,499,400,000
Long-term Debt Due Within One Year			291,300,000						291,300,000				83,700,000
Long-term Debt			3,249,000,000						3,249,000,000				3,415,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									48,600,000		$ 299,200,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			183,200,000						183,200,000				156,400,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			502,100,000			497,200,000			1,031,800,000		1,022,600,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition			361,000,000						$ 361,000,000				348,000,000
Maximum Percentage Debt to Capitalization									67.50%
Issuance of Long-term Debt									$ 80,400,000		494,900,000
Fixed Performance Obligations			24,300,000						24,300,000
Indiana Michigan Power Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			52,600,000						52,600,000				63,300,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,100,000			1,900,000			3,900,000		3,100,000
Indiana Michigan Power Co [Member] | 2024 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			2,200,000						2,200,000
Indiana Michigan Power Co [Member] | 2025-2026[Member]
Financing Activities (Textuals)
Fixed Performance Obligations			8,800,000						8,800,000
Indiana Michigan Power Co [Member] | 2027-2028 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			8,800,000						8,800,000
Indiana Michigan Power Co [Member] | After 2028
Financing Activities (Textuals)
Fixed Performance Obligations			4,500,000						4,500,000
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			10,000,000.0	[22]		9,600,000	[23]		20,100,000	[24]	17,700,000	[25]
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			29,400,000	[26]		45,000,000.0	[27]		57,000,000.0	[28]	66,400,000	[29]
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			23,000,000			17,000,000			41,000,000		35,000,000
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			54,800,000	[30]		63,500,000	[31]		192,100,000	[32]	167,500,000	[33]
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			190,500,000			185,200,000			415,300,000		424,800,000
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			150,800,000			141,400,000			295,600,000		280,300,000
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			153,100,000	[34]		155,900,000			301,000,000.0	[35]	308,500,000	[36]
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			1,200,000			2,600,000		2,500,000
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			495,700,000			483,700,000			1,014,500,000		1,016,100,000
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			64,800,000			73,100,000			212,200,000		185,200,000
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			589,900,000			601,800,000			1,283,700,000		1,267,700,000
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			2,100,000			2,400,000			4,900,000		5,500,000
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			20,500,000			14,500,000			35,500,000		30,400,000
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			3,800,000			3,900,000			$ 7,900,000		$ 7,800,000
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate									5.79%		5.69%
Minimum Interest Rate									5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool									$ 126,900,000
Maximum Loans to Money Pool									4,500,000
Average Borrowings from Money Pool									62,200,000
Average Loans to Money Pool									4,500,000
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									5.67%		5.13%
Average Interest Rate For Funds Loaned									5.68%		5.42%
Indiana Michigan Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			$ (52,600,000)						$ (52,600,000)
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									$ 6,100,000
Due Date									2025
Interest Rate (Percentage)			0.93%						0.93%
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									$ 1,900,000
Due Date									2025
Interest Rate (Variable)									Variable
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									$ 10,100,000
Due Date									2026
Interest Rate (Percentage)			3.44%						3.44%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Seven [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 10,600,000
Due Date									2027
Interest Rate (Percentage)			5.93%						5.93%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Eight [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 13,800,000
Due Date									2028
Interest Rate (Percentage)			6.01%						6.01%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Nine
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 3,100,000
Due Date									2028
Interest Rate (Percentage)			6.41%						6.41%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]								$ 80,400,000
Due Date									2028
Interest Rate (Percentage)			6.41%						6.41%
Indiana Michigan Power Co [Member] | Other Long Term Debt Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 1,300,000
Due Date									2025
Interest Rate (Percentage)			6.00%						6.00%
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									$ 1,700,000
Due Date									2024
Interest Rate (Variable)									Variable
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Twelve | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		$ 9,000,000
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,714,300,000						$ 3,714,300,000				3,366,800,000
Long-term Debt			3,714,300,000						3,714,300,000				3,366,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									0		$ 600,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			517,100,000						517,100,000				541,700,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			771,500,000			783,900,000			1,617,200,000		1,668,300,000
Financing Activities (Textuals)
Issuance of Long-term Debt									346,300,000		395,100,000
Ohio Power Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			0						0				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			8,200,000			11,400,000		15,800,000
Financing Activities (Textuals)
Net Loans To Money Pool			49,900,000						49,900,000				0
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			23,600,000	[22]		21,000,000.0	[23]		47,400,000	[24]	38,900,000	[25]
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			28,500,000	[26]		45,500,000	[27]		70,700,000	[28]	78,700,000	[29]
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	[30]		0	[31]		0	[32]	0	[33]
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			465,300,000			429,300,000			1,021,800,000		955,300,000
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			276,100,000			257,800,000			562,200,000		536,300,000
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			89,000,000.0	[34]		116,800,000			189,500,000	[35]	290,400,000	[36]
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			4,500,000			3,600,000			8,700,000		7,400,000
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			834,900,000			807,500,000			1,782,200,000		1,789,400,000
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			23,600,000			21,000,000.0			47,400,000		38,900,000
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			887,000,000.0			874,000,000.0			1,900,300,000		1,907,000,000
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			2,800,000			2,100,000			5,500,000		7,300,000
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			7,600,000			$ 14,800,000		$ 14,900,000
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate									5.79%		5.69%
Minimum Interest Rate									5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool									$ 310,000,000.0
Maximum Loans to Money Pool									159,900,000
Average Borrowings from Money Pool									181,900,000
Average Loans to Money Pool									105,300,000
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									5.70%		5.30%
Average Interest Rate For Funds Loaned									5.52%		5.60%
Ohio Power Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 49,900,000						$ 49,900,000
Ohio Power Co [Member] | Senior Unsecured Notes Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]								$ 350,000,000.0
Due Date									2034
Interest Rate (Percentage)			5.65%						5.65%
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 2,385,200,000						$ 2,385,200,000				2,384,600,000
Long-term Debt Due Within One Year			125,600,000						125,600,000				600,000
Long-term Debt			2,259,600,000						2,259,600,000				2,384,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									300,000		$ 300,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			144,100,000						144,100,000				134,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			425,000,000.0			460,200,000			$ 786,600,000		876,500,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization									67.50%
Issuance of Long-term Debt									$ 0		469,800,000
Public Service Co Of Oklahoma [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			261,800,000						261,800,000				54,400,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,100,000			100,000			4,600,000		800,000
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			10,200,000	[22]		9,900,000	[23]		21,000,000.0	[24]	21,200,000	[25]
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			12,400,000	[26]		7,200,000	[27]		24,400,000	[28]	9,500,000	[29]
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			2,700,000	[30]		4,300,000	[31]		4,900,000	[32]	5,200,000	[33]
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			187,800,000			186,500,000			346,000,000.0		357,400,000
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			130,100,000			131,700,000			233,100,000		240,800,000
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			91,100,000	[34]		107,800,000			171,400,000	[35]	206,100,000	[36]
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			25,900,000			28,300,000			47,400,000		52,500,000
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			434,900,000			454,300,000			797,900,000		856,800,000
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			12,900,000			14,200,000			25,900,000		26,400,000
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			460,200,000			475,700,000			848,200,000		892,700,000
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			9,600,000			2,200,000			15,800,000		3,700,000
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			3,500,000			$ 6,800,000		$ 6,700,000
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate									5.79%		5.69%
Minimum Interest Rate									5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool									$ 302,200,000
Maximum Loans to Money Pool									0
Average Borrowings from Money Pool									186,500,000
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									5.64%		5.47%
Average Interest Rate For Funds Loaned									0.00%		5.11%
Public Service Co Of Oklahoma [Member] | Utility [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			$ (261,800,000)						$ (261,800,000)
Public Service Co Of Oklahoma [Member] | Other Long Term Debt Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 300,000
Due Date									2027
Interest Rate (Percentage)			3.00%						3.00%
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,648,300,000						$ 3,648,300,000				3,646,900,000
Long-term Debt			3,648,300,000						3,648,300,000				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			5,700,000						5,700,000				4,300,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			182,600,000						182,600,000				168,300,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			471,900,000			460,500,000			$ 897,300,000		898,100,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization									67.50%
Issuance of Long-term Debt									$ 0		346,800,000
Southwestern Electric Power Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			285,400,000						285,400,000				88,700,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			16,500,000			19,700,000			30,400,000		31,300,000
Financing Activities (Textuals)
Net Loans To Money Pool			2,800,000						2,800,000				$ 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			46,700,000	[22]		38,300,000	[23]		86,300,000	[24]	81,200,000	[25]
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			15,000,000						28,000,000
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			7,600,000	[26]		7,000,000.0	[27]		17,200,000	[28]	14,900,000	[29]
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			50,100,000	[30]		43,900,000	[31]		97,200,000	[32]	83,500,000	[33]
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			120,700,000			185,100,000			303,100,000		361,000,000.0
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			100,700,000			153,800,000			240,700,000		297,300,000
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			72,300,000	[34]		110,600,000			167,300,000	[35]	214,800,000	[36]
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			1,700,000			2,600,000			4,300,000		5,200,000
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			295,400,000			452,100,000			715,400,000		878,300,000
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			96,800,000			82,200,000			183,500,000		164,700,000
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			399,800,000			541,300,000			916,100,000		1,057,900,000
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			2,400,000			800,000			6,300,000		1,300,000
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			4,300,000			4,400,000			$ 9,100,000		$ 8,700,000
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate									5.79%		5.69%
Minimum Interest Rate									5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool									$ 362,200,000
Maximum Loans to Money Pool									0
Average Borrowings from Money Pool									225,600,000
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									5.64%		5.22%
Average Interest Rate For Funds Loaned									0.00%		0.00%
Southwestern Electric Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			(285,400,000)						$ (285,400,000)
Southwestern Electric Power Co [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool									2,800,000
Average Loans to Money Pool									$ 2,400,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned									5.79%		5.69%
Minimum Interest Rate for Funds Loaned									5.56%		4.66%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned									5.68%		5.35%
Southwestern Electric Power Co [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 2,800,000						$ 2,800,000
Southwestern Electric Power Co [Member] | Loans Payable [Member]
Short-term Debt:
Weighted Average Interest Rate	[4]		7.68%						7.68%				7.71%
Transource Energy [Member] | Senior Unsecured Notes Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 1,200,000
Due Date									2050
Interest Rate (Percentage)			2.75%						2.75%
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]								$ 32,000,000.0
Due Date									2025
Interest Rate (Variable)									Variable
Transource Energy [Member] | Other Long Term Debt Seven | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt		$ 2,000,000
Due Date		2025
Interest Rate (Variable)		variable
Wheeling Power Company | Notes Payable, Other Payable Eleven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt									$ 265,000,000.0
Due Date									2024
Interest Rate (Variable)									Variable
Wheeling Power Company | Notes Payable, Other Payable Two [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)			6.89%						6.89%
AEP Generating Company | Notes Payable, Other Payable Ten
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%						2.43%
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,			$ (1,100,000)		$ 14,800,000	$ (3,300,000)		$ 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 $361 million and $348 million as of June 30, 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 June 30, 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 $393 million. The affiliated revenue for Vertically Integrated Utilities was $41 million. The remaining affiliated amounts were immaterial.

[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $360 million. The remaining affiliated amounts were immaterial.

[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $780 million. The affiliated revenue for Vertically Integrated Utilities was $83 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $712 million. The affiliated revenue for Vertically Integrated Utilities was $80 million. The remaining affiliated amounts were immaterial.

[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $30 million. The remaining affiliated amounts were immaterial.

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $26 million. The remaining affiliated amounts were immaterial.

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $79 million. The remaining affiliated amounts were immaterial.

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $55 million. The remaining affiliated amounts were immaterial.

[15] Amounts include affiliated and nonaffiliated revenues

[16] Amounts include affiliated and nonaffiliated revenues.

[17] Amounts include affiliated and nonaffiliated revenues.

[18] Amounts include affiliated and nonaffiliated revenues

[19] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $24 million. The remaining affiliated amounts were immaterial.

[20] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $70 million. The remaining affiliated amounts were immaterial.

[21] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $10 million. The remaining affiliated amounts were immaterial.

[22] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $389 million, APCo was $22 million and SWEPCo was $15 million. The remaining affiliated amounts were immaterial.

[23] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $357 million. The remaining affiliated amounts were immaterial.

[24] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $773 million, APCo was $43 million and SWEPCo was $28 million. The remaining affiliated amounts were immaterial.

[25] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $706 million. The remaining affiliated amounts were immaterial.

[26] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $23 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

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

[28] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $41 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[29] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $35 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[30] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $36 million primarily related to the PPA with KGPCo.

[31] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $38 million primarily related to the PPA with KGPCo.

[32] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $77 million primarily related to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[33] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $85 million primarily related to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[34] Amounts include affiliated and nonaffiliated revenues.

[35] Amounts include affiliated and nonaffiliated revenues.

[36] Amounts include affiliated and nonaffiliated revenues.

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

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