Financing Activities (Details) - USD ($)			1 Months Ended	3 Months Ended						6 Months Ended
		Mar. 15, 2023	Jul. 27, 2023	Jun. 30, 2023		Mar. 31, 2023	Jun. 30, 2022		Mar. 31, 2022	Jun. 30, 2023		Jun. 30, 2022		Dec. 31, 2022
Long-term Debt
Senior Unsecured Notes				$ 33,491,500,000						$ 33,491,500,000				$ 30,174,800,000
Pollution Control Bonds				1,770,900,000						1,770,900,000				1,770,200,000
Notes Payable				165,800,000						165,800,000				269,700,000
Securitization Bonds				432,100,000						432,100,000				487,800,000
Spent Nuclear Fuel Obligation	[1]			292,300,000						292,300,000				285,600,000
Junior Subordinated Notes	[2]			2,385,000,000						2,385,000,000				2,381,300,000
Other Long-term Debt				1,604,700,000						1,604,700,000				1,431,600,000
Total Long-term Debt Outstanding				40,142,300,000						40,142,300,000				36,801,000,000
Long-term Debt Due Within One Year				3,380,300,000						3,380,300,000				2,486,400,000
Long-term Debt				36,762,000,000						36,762,000,000				34,314,600,000
Liabilities Held for Sale				64,800,000						64,800,000				0
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									4,003,000,000
Repayments of Long-term Debt										641,700,000		$ 582,400,000
Short-term Debt:
Securitized Debt for Receivables	[4]			750,000,000.0						750,000,000.0				750,000,000.0
Commercial Paper				2,238,700,000						2,238,700,000				2,862,200,000
Total Short-term Debt				$ 3,867,600,000						$ 3,867,600,000				$ 4,112,200,000
Securitized Debt for Receivables	[4],[5]			5.45%						5.45%				4.67%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable				5.25%			0.91%			5.06%		0.61%
Net Uncollectible Accounts Receivable Written Off				$ 7,300,000			$ 6,200,000			$ 14,100,000		$ 13,600,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts				1,184,900,000						1,184,900,000				$ 1,167,700,000
Total Principal Outstanding				750,000,000.0						750,000,000.0				750,000,000.0
Delinquent Securitized Accounts Receivable				49,400,000						49,400,000				44,200,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable				41,700,000						41,700,000				39,700,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable				392,400,000						392,400,000				360,900,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				4,372,500,000			4,639,700,000			9,063,400,000		9,232,300,000
Financing Activities (Textuals)
Maximum Value of Shares to be Issued Under ATM Program										$ 1,000,000,000
Maximum Percentage Paid to Selling Agents										2.00%
Issuance of Common Stock										$ 77,600,000		812,700,000
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition														330,000,000
Maximum Percentage Debt to Capitalization										67.50%
Total Commitment from Bank Conduits to Finance Receivables				750,000,000						$ 750,000,000
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,				(3,300,000)		$ 12,500,000	(18,800,000)		$ 16,700,000
Commitment from Bank Conduits to Finance Receivables				125,000,000						125,000,000
Commitment from Bank Conduits to Finance Receivables Two				625,000,000						625,000,000
Assets Held for Sale				1,382,800,000						1,382,800,000				$ 0
Issuance of Long-term Debt										3,958,800,000		2,639,100,000
Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				0			0			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			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				(464,200,000)			(373,300,000)			(907,900,000)		(765,500,000)
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				45,500,000			53,500,000			87,000,000.0		94,100,000
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				9,400,000			4,800,000			18,300,000		9,400,000
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				13,200,000			5,200,000			13,300,000		15,000,000.0
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]			25,800,000			10,100,000			53,600,000		19,300,000
Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				350,600,000	[7]		363,300,000	[8]		677,800,000	[9]	676,200,000	[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				(402,800,000)	[7]		(332,000,000.0)	[8]		(804,600,000)	[9]	(693,800,000)	[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				455,800,000	[7]		421,600,000	[8]		905,900,000	[9]	836,100,000	[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				360,000,000			334,000,000			712,000,000		661,000,000
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				113,500,000	[7]		108,800,000	[8]		228,200,000	[9]	214,100,000	[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										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				184,100,000	[7]		164,900,000	[8]		348,300,000	[9]	319,800,000	[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				117,200,000	[11]		116,700,000	[12]		182,500,000	[13]	235,800,000	[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				(39,900,000)	[11]		(21,100,000)	[12]		(83,600,000)	[13]	(39,700,000)	[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				4,300,000	[11]		200,000	[12]		7,900,000	[13]	0	[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				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				61,900,000	[11]		49,200,000	[12]		94,500,000	[13]	110,800,000	[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				56,100,000	[11]		65,900,000	[12]		98,900,000	[13]	119,700,000	[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				6,200,000	[11]		1,600,000	[12]		6,800,000	[13]	10,200,000	[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				28,600,000	[11]		20,900,000	[12]		58,000,000.0	[13]	34,800,000	[14]
Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				161,100,000			271,400,000			376,300,000		498,900,000
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			100,000			100,000		100,000
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
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				141,400,000			188,300,000			324,200,000		375,500,000
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			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				19,600,000			83,000,000.0			52,000,000.0		123,300,000
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			0		0
Residential [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				1,536,100,000			1,540,900,000			3,363,300,000		3,292,300,000
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				962,000,000.0			979,300,000			2,132,400,000		2,130,100,000
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				574,100,000			561,600,000			1,230,900,000		1,162,200,000
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				1,001,000,000			956,500,000			2,010,300,000		1,819,100,000
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				642,700,000			624,800,000			1,276,100,000		1,197,700,000
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				358,300,000			331,700,000			734,200,000		621,400,000
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				850,900,000			804,300,000			1,733,900,000	[15]	1,500,200,000
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)			0			(300,000)	[15]	(400,000)
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			0			0	[15]	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				698,900,000			641,800,000			1,369,200,000	[15]	1,204,800,000
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				152,100,000			162,500,000			365,000,000.0	[15]	295,800,000
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			0			0	[15]	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			0			0	[15]	0
Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				71,200,000			65,700,000			140,100,000		124,700,000
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				58,900,000			52,900,000			115,700,000		100,300,000
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				12,300,000			12,800,000			24,400,000		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				3,459,200,000			3,367,400,000			7,247,600,000		6,736,300,000
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)			0			(300,000)		(400,000)
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				2,362,500,000			2,298,800,000			4,893,400,000		4,632,900,000
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				1,096,800,000			1,068,600,000			2,354,500,000		2,103,800,000
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				30,000,000.0	[16]		35,300,000	[17]		51,200,000	[15]	56,900,000	[18]
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				(3,100,000)	[16]		(2,900,000)	[17]		(3,200,000)	[15]	(3,700,000)	[18]
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	[17]		0	[15]	0	[18]
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	[17]		0	[15]	0	[18]
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	[17]		0	[15]	0	[18]
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				33,100,000	[16]		38,200,000	[17]		54,400,000	[15]	60,600,000	[18]
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	[17]		0	[15]	0	[18]
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				398,800,000	[16]		407,300,000	[17]		812,300,000	[19]	790,300,000	[20]
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				(10,100,000)	[16]		(2,300,000)	[17]		(10,000,000.0)	[19]	(11,300,000)	[20]
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	[16]		0	[17]		0	[19]	0	[20]
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	[16]		0	[17]		0	[19]	0	[20]
Retail, Trading and Marketing Revenues [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							5,000,000
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	[16]		0	[17]		0	[19]	0	[20]
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				407,700,000	[16]		408,300,000	[17]		821,400,000	[19]	797,100,000	[20]
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				1,200,000	[16]		1,300,000	[17]		900,000	[19]	4,500,000	[20]
Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				940,500,000			1,077,300,000			1,917,600,000		2,022,300,000
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				(415,900,000)			(337,100,000)			(817,700,000)		(708,700,000)
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				455,800,000			421,600,000			905,900,000		836,100,000
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				254,900,000			297,100,000			552,400,000		589,600,000
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				184,100,000			164,900,000			348,300,000		319,800,000
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				460,400,000			529,500,000			927,800,000		981,000,000.0
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				1,200,000			1,300,000			900,000		4,500,000
Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				4,516,900,000			4,561,400,000			9,347,700,000		8,994,400,000
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				(455,900,000)			(358,200,000)			(901,600,000)		(748,800,000)
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				460,100,000			421,800,000			913,800,000		836,100,000
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				2,679,300,000			2,645,100,000			5,540,300,000		5,333,300,000
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				1,337,000,000			1,299,400,000			2,801,700,000		2,543,300,000
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				466,600,000			531,100,000			934,600,000		991,200,000
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				29,800,000			22,200,000			58,900,000		39,300,000
Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				94,500,000			93,500,000			186,900,000		187,600,000
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										55,000,000		19,000,000
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]			6,200,000			14,400,000			8,500,000		25,100,000
Retail, Trading and Marketing | 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										$ 10,000,000		11,000,000
2020 Equity Units [Member]
Financing Activities (Textuals)
Equity Units Issued										17,000,000
Per Unit Conversion for Equity Units				$ 50						$ 50
Net Equity Units Issuance Proceeds										833,000,000
Principal Amounts of Junior Subordinated Debt										$ 1,000
Forward Equity Purchase Contract Date										2023
Maximum Shares Issued Under Equity Units Conversion										10,205,100
Corporate unit ownership share of an equity unit				5.00%						5.00%
Junior Subordinated Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Interest Rate (Percentage)				5.699%						5.699%
Junior Subordinated Debt [Member] | 2020 Equity Units [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt										$ 850,000,000
Interest Rate (Percentage)				1.30%						1.30%
Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									$ 850,000,000.0
Due Date										2033
Interest Rate (Percentage)				5.63%						5.63%
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]			5.50%						5.50%				4.80%
Term Loan [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]			5.94%						5.94%				5.17%
Term Loan				$ 125,000,000.0						$ 125,000,000.0				$ 125,000,000.0
Term Loan 2 [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]			5.94%						5.94%				5.17%
Term Loan				$ 150,000,000.0						$ 150,000,000.0				$ 150,000,000.0
Term Loan 3
Short-term Debt:
Weighted Average Interest Rate	[5]			6.08%						6.08%				0.00%
Term Loan				$ 500,000,000.0						$ 500,000,000.0				$ 0
Term Loan 4
Short-term Debt:
Weighted Average Interest Rate	[5]			5.94%						5.94%				5.23%
Term Loan				$ 100,000,000.0						$ 100,000,000.0				$ 100,000,000.0
Term Loan 5
Short-term Debt:
Weighted Average Interest Rate	[5]			0.00%						0.00%				4.87%
Term Loan				$ 0						$ 0				$ 125,000,000.0
AEP Texas Inc. [Member]
Long-term Debt
Total Long-term Debt Outstanding				5,937,500,000						5,937,500,000				5,657,800,000
Long-term Debt Due Within One Year				154,700,000						154,700,000				278,500,000
Long-term Debt				5,782,800,000						5,782,800,000				5,379,300,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 168,200,000		242,000,000.0
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization										67.50%
Issuance of Long-term Debt										$ 445,900,000		1,188,600,000
AEP Texas Inc. [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				135,900,000						135,900,000				96,500,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				1,300,000			800,000			2,500,000		1,700,000
Financing Activities (Textuals)
Net Loans To Money Pool				6,900,000						6,900,000				6,900,000
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				163,100,000	[21]		143,800,000	[22]		309,400,000	[23]	276,900,000	[24]
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				10,700,000	[25]		5,600,000	[26]		20,400,000	[27]	14,900,000	[28]
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	[29]		0	[30]		0	[31]	0	[32]
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				144,900,000			174,900,000			275,600,000		316,800,000
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				100,600,000			110,600,000			197,900,000		205,500,000
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				35,200,000			36,600,000			74,500,000	[33]	67,200,000
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				8,700,000			9,500,000			17,000,000.0		17,700,000
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				289,400,000			331,600,000			565,000,000.0		607,200,000
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				163,100,000			143,800,000			309,400,000		276,900,000
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				463,200,000			481,000,000.0			894,800,000		899,000,000.0
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			1,100,000			$ 1,100,000		$ 2,200,000
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate										5.69%		2.11%
Minimum Interest Rate										4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool										$ 477,500,000
Maximum Loans to Money Pool										0
Average Borrowings from Money Pool										279,900,000
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										5.35%		0.90%
Average Interest Rate For Funds Loaned										0.00%		1.48%
AEP Texas Inc. [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				(135,900,000)						$ (135,900,000)
AEP Texas Inc. [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool										6,900,000
Average Loans to Money Pool										$ 6,800,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned										5.69%		2.11%
Minimum Interest Rate for Funds Loaned										4.66%		0.46%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned										5.35%		0.98%
AEP Texas Inc. [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool				$ 6,900,000						$ 6,900,000
AEP Texas Inc. [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 31,500,000
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										$ 11,700,000
Due Date										2025
Interest Rate (Percentage)				2.06%						2.06%
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	[3]									$ 450,000,000.0
Due Date										2033
Interest Rate (Percentage)				5.40%						5.40%
AEP Texas Inc. [Member] | Senior Unsecured Notes Eight
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 125,000,000.0
Due Date										2023
Interest Rate (Percentage)				3.09%						3.09%
AEP Transmission Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 5,473,000,000						$ 5,473,000,000				4,782,800,000
Long-term Debt Due Within One Year				60,000,000.0						60,000,000.0				60,000,000.0
Long-term Debt				5,413,000,000						5,413,000,000				4,722,800,000
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				0.60%						0.60%
Maximum Percentage Debt to Capitalization										67.50%
Issuance of Long-term Debt										$ 689,100,000		$ 540,900,000
AEP Transmission Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				$ 74,400,000						74,400,000				229,300,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				365,800,000			333,900,000			723,200,000		658,900,000
Financing Activities (Textuals)
Net Loans To Money Pool				79,400,000						79,400,000				4,400,000
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				444,700,000	[21]		406,100,000	[22]		883,400,000	[23]	806,400,000	[24]
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				357,000,000			330,000,000			706,000,000		653,000,000
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				4,100,000	[25]		200,000	[26]		7,800,000	[27]	(100,000)	[28]
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	[29]		0	[30]		0	[31]	0	[32]
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			0			0	[33]	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			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				444,700,000			406,100,000			883,400,000		806,400,000
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				448,800,000			406,300,000			$ 891,200,000		$ 806,300,000
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate										5.69%		2.11%
Minimum Interest Rate										4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool										$ 471,300,000
Maximum Loans to Money Pool										309,400,000
Average Borrowings from Money Pool										153,100,000
Average Loans to Money Pool										85,900,000
Authorized Short Term Borrowing Limit	[34]									$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed										5.16%		0.93%
Average Interest Rate For Funds Loaned										5.46%		1.49%
AEP Transmission Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool				26,900,000						$ 26,900,000
AEP Transmission Co [Member] | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool										29,400,000
Maximum Loans to Money Pool										158,100,000
Average Borrowings from Money Pool										2,900,000
Average Loans to Money Pool										70,200,000
Borrowings from Parent				21,900,000						21,900,000
Loans to Parent				$ 0						0
Authorized Short Term Borrowing Limit	[35]									$ 50,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed										5.69%		2.11%
Minimum Interest Rate For Funds Borrowed										4.53%		0.46%
Maximum Interest Rate For Funds Loaned										5.69%		2.11%
Minimum Interest Rate for Funds Loaned										4.53%		0.46%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed										5.27%		1.02%
Average Interest Rate For Funds Loaned										5.35%		0.89%
AEP Transmission Co [Member] | Senior Unsecured Notes Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									$ 700,000,000.0
Due Date										2053
Interest Rate (Percentage)				5.40%						5.40%
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 5,599,700,000						$ 5,599,700,000				5,410,500,000
Long-term Debt Due Within One Year				538,300,000						538,300,000				251,800,000
Long-term Debt				5,061,400,000						5,061,400,000				5,158,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										13,000,000.0		$ 117,100,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				181,900,000						181,900,000				194,400,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				414,900,000			339,000,000.0			$ 921,100,000		754,500,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization										67.50%
Issuance of Long-term Debt										$ 200,000,000.0		103,300,000
Appalachian Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				266,100,000						266,100,000				182,200,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				61,100,000			63,100,000			130,700,000		120,000,000.0
Financing Activities (Textuals)
Net Loans To Money Pool				18,900,000						18,900,000				19,800,000
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				43,900,000	[21]		40,800,000	[22]		85,300,000	[23]	81,900,000	[24]
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				11,800,000	[25]		20,600,000	[26]		24,800,000	[27]	44,900,000	[28]
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				64,200,000	[29]		63,500,000	[30]		144,400,000	[31]	119,700,000	[32]
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				38,000,000			42,000,000			85,000,000		78,000,000
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				324,800,000			313,200,000			795,300,000		771,200,000
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				163,600,000			152,600,000			334,900,000		306,500,000
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				192,500,000			161,900,000			378,300,000	[33]	315,700,000
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				25,200,000			20,200,000			51,400,000		40,800,000
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				706,100,000			647,900,000			1,559,900,000		1,434,200,000
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				108,100,000			104,300,000			229,700,000		201,600,000
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				826,000,000.0			772,800,000			1,814,400,000		1,680,700,000
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				2,900,000			5,600,000			6,500,000		8,900,000
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				4,300,000			1,500,000			$ 9,200,000		$ 2,800,000
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate										5.69%		2.11%
Minimum Interest Rate										4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool										$ 388,600,000
Maximum Loans to Money Pool										19,800,000
Average Borrowings from Money Pool										295,000,000.0
Average Loans to Money Pool										18,900,000
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										5.36%		1.08%
Average Interest Rate For Funds Loaned										5.35%		0.95%
Appalachian Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				$ (247,200,000)						$ (247,200,000)
Appalachian Power Co [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									$ 200,000,000.0
Due Date										2024
Interest Rate (Variable)										Variable
Appalachian Power Co [Member] | Securitization Bonds Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 9,700,000
Due Date										2023
Interest Rate (Percentage)				2.01%						2.01%
Appalachian Power Co [Member] | Securitization Bonds Four
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 3,300,000
Due Date										2028
Interest Rate (Percentage)				3.77%						3.77%
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 3,464,100,000						$ 3,464,100,000				3,260,800,000
Long-term Debt Due Within One Year				74,300,000						74,300,000				341,800,000
Long-term Debt				3,389,800,000						3,389,800,000				2,919,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										299,200,000		$ 40,700,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				177,300,000						177,300,000				166,900,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				497,200,000			502,400,000			1,022,600,000		1,015,800,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition				341,000,000						$ 341,000,000				330,000,000
Maximum Percentage Debt to Capitalization										67.50%
Issuance of Long-term Debt										$ 494,900,000		72,800,000
Indiana Michigan Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				0						0				249,900,000
Financing Activities (Textuals)
Net Loans To Money Pool				40,500,000						40,500,000				23,000,000.0
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				9,600,000	[21]		8,700,000	[22]		17,700,000	[23]	17,500,000	[24]
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				45,000,000.0	[25]		25,800,000	[26]		66,400,000	[27]	55,700,000	[28]
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				17,000,000
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				63,500,000	[29]		94,200,000	[30]		167,500,000	[31]	184,600,000	[32]
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				185,200,000			195,200,000			424,800,000		427,000,000.0
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				141,400,000			138,600,000			280,300,000		265,200,000
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				155,900,000			160,000,000.0			308,500,000	[33]	296,500,000
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				1,200,000			1,200,000			2,500,000		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				483,700,000			495,000,000.0			1,016,100,000		991,200,000
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				73,100,000			102,900,000			185,200,000		202,100,000
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				601,800,000			623,700,000			1,267,700,000		1,249,000,000
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				2,400,000			2,800,000			5,500,000		5,600,000
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							19,000,000			35,000,000		29,000,000
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				3,900,000			2,000,000.0			$ 7,800,000		$ 3,700,000
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate										5.69%		2.11%
Minimum Interest Rate										4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool										$ 475,300,000
Maximum Loans to Money Pool										100,300,000
Average Borrowings from Money Pool										174,000,000.0
Average Loans to Money Pool										43,000,000.0
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										5.13%		0.92%
Average Interest Rate For Funds Loaned										5.42%		0.96%
Indiana Michigan Power Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool				$ 40,500,000						$ 40,500,000
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										$ 7,900,000
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										$ 13,700,000
Due Date										2026
Interest Rate (Percentage)				3.44%						3.44%
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										$ 13,600,000
Due Date										2027
Interest Rate (Percentage)				5.93%						5.93%
Indiana Michigan Power Co [Member] | OtherLongTermDebtThree
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 1,200,000
Due Date										2025
Interest Rate (Percentage)				6.00%						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
Repayments of Long-term Debt			$ 8,000,000
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										2023
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										$ 2,400,000
Due Date										2024
Interest Rate (Variable)										Variable
Indiana Michigan Power Co [Member] | Senior Unsecured Notes Four
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									$ 500,000,000.0
Due Date										2053
Interest Rate (Percentage)				5.63%						5.63%
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										$ 9,200,000
Due Date										2025
Interest Rate (Variable)										Variable
Indiana Michigan Power Co [Member] | Senior Unsecured Notes Nine
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 250,000,000.0
Due Date										2023
Interest Rate (Percentage)				3.20%						3.20%
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 3,365,600,000						$ 3,365,600,000				2,970,300,000
Long-term Debt Due Within One Year				0						0				100,000
Long-term Debt				3,365,600,000						3,365,600,000				2,970,200,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										600,000		$ 100,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				477,400,000						477,400,000				478,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				783,900,000			693,300,000			1,668,300,000		1,409,900,000
Financing Activities (Textuals)
Issuance of Long-term Debt										395,100,000		0
Ohio Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				72,300,000						72,300,000				172,900,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				8,200,000			3,900,000			15,800,000		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				21,000,000.0	[21]		21,100,000	[22]		38,900,000	[23]	42,900,000	[24]
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				45,500,000	[25]		60,200,000	[26]		78,700,000	[27]	104,800,000	[28]
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	[29]		0	[30]		0	[31]	0	[32]
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				429,300,000			386,700,000			955,300,000		845,400,000
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				257,800,000			221,100,000			536,300,000		415,800,000
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				116,800,000			126,000,000.0			290,400,000	[33]	228,700,000
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				3,600,000			3,400,000			7,400,000		6,700,000
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				807,500,000			737,200,000			1,789,400,000		1,496,600,000
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				21,000,000.0			21,100,000			38,900,000		42,900,000
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				874,000,000.0			818,500,000			1,907,000,000		1,644,300,000
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				2,100,000			1,800,000			7,300,000		3,900,000
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				7,600,000			7,500,000			$ 14,900,000		$ 14,900,000
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate										5.69%		2.11%
Minimum Interest Rate										4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool										$ 485,700,000
Maximum Loans to Money Pool										64,700,000
Average Borrowings from Money Pool										266,400,000
Average Loans to Money Pool										40,200,000
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										5.30%		0.83%
Average Interest Rate For Funds Loaned										5.60%		1.20%
Ohio Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				$ (72,300,000)						$ (72,300,000)
Ohio Power Co [Member] | OtherLongTermDebtFour
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 600,000
Due Date										2028
Interest Rate (Percentage)				1.15%						1.15%
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	[3]									$ 400,000,000.0
Due Date										2033
Interest Rate (Percentage)				5.00%						5.00%
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 2,383,900,000						$ 2,383,900,000				1,912,800,000
Long-term Debt Due Within One Year				600,000						600,000				500,000
Long-term Debt				2,383,300,000						2,383,300,000				1,912,300,000
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				177,800,000						177,800,000				155,500,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				460,200,000			428,500,000			$ 876,500,000		791,900,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization										67.50%
Issuance of Long-term Debt										$ 469,800,000		500,000,000.0
Public Service Co Of Oklahoma [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				68,100,000						68,100,000				364,200,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				100,000			800,000			800,000		1,400,000
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				9,900,000	[21]		9,100,000	[22]		21,200,000	[23]	18,700,000	[24]
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				7,200,000	[25]		9,600,000	[26]		9,500,000	[27]	15,000,000.0	[28]
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				4,300,000	[29]		300,000	[30]		5,200,000	[31]	9,800,000	[32]
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				186,500,000			185,200,000			357,400,000		351,100,000
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				131,700,000			121,200,000			240,800,000		218,700,000
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				107,800,000			92,500,000			206,100,000	[33]	171,100,000
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				28,300,000			25,800,000			52,500,000		47,000,000.0
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				454,300,000			424,700,000			856,800,000		787,900,000
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				14,200,000			9,400,000			26,400,000		28,500,000
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				475,700,000			443,700,000			892,700,000		831,400,000
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				2,200,000			2,100,000			3,700,000		2,700,000
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				3,500,000			1,300,000			$ 6,700,000		$ 2,200,000
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate										5.69%		2.11%
Minimum Interest Rate										4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool										$ 375,000,000.0
Maximum Loans to Money Pool										121,500,000
Average Borrowings from Money Pool										127,500,000
Average Loans to Money Pool										74,800,000
Authorized Short Term Borrowing Limit										$ 400,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed										5.47%		1.17%
Average Interest Rate For Funds Loaned										5.11%		0.65%
Public Service Co Of Oklahoma [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				$ (68,100,000)						$ (68,100,000)
Public Service Co Of Oklahoma [Member] | Other Long Term Debt Five
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%
Public Service Co Of Oklahoma [Member] | Senior Unsecured Notes Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									$ 475,000,000.0
Due Date										2033
Interest Rate (Percentage)				5.25%						5.25%
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 3,645,600,000						$ 3,645,600,000				3,391,600,000
Long-term Debt Due Within One Year				0						0				6,200,000
Long-term Debt				3,645,600,000						3,645,600,000				3,385,400,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										94,100,000		$ 3,100,000
Short-term Debt:
Notes Payable				3,900,000						3,900,000				0
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				191,600,000						191,600,000				194,000,000.0
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				460,500,000			437,200,000			$ 898,100,000		831,700,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization										67.50%
Issuance of Long-term Debt										$ 346,800,000		0
Southwestern Electric Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				32,600,000						32,600,000				310,700,000
Financing Activities (Textuals)
Net Loans To Money Pool				2,200,000						2,200,000				$ 2,100,000
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				38,300,000	[21]		39,300,000	[22]		81,200,000	[23]	74,500,000	[24]
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				7,000,000.0	[25]		6,000,000.0	[26]		14,900,000	[27]	11,300,000	[28]
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				43,900,000	[29]		57,400,000	[30]		83,500,000	[31]	118,600,000	[32]
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				185,100,000			188,600,000			361,000,000.0		364,500,000
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				153,800,000			146,000,000.0			297,300,000		276,500,000
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				110,600,000			97,100,000			214,800,000	[33]	181,800,000
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			4,400,000			5,200,000		6,800,000
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				452,100,000			436,100,000			878,300,000		829,600,000
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				82,200,000			96,700,000			164,700,000		193,100,000
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				541,300,000			538,800,000			1,057,900,000		1,034,000,000
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				800,000			400,000			1,300,000		1,000,000.0
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				4,400,000			1,500,000			$ 8,700,000		$ 2,800,000
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate										5.69%		2.11%
Minimum Interest Rate										4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool	[36]									$ 401,600,000
Maximum Loans to Money Pool										0
Average Borrowings from Money Pool										220,600,000
Average Loans to Money Pool										0
Authorized Short Term Borrowing Limit										$ 400,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed										5.22%		1.25%
Average Interest Rate For Funds Loaned										0.00%		0.55%
Financing Activities (Textuals)
Amount Exceeding Maximum Borrowings from Money Pool		$ 1,600,000
Southwestern Electric Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool				(32,600,000)						$ (32,600,000)
Southwestern Electric Power Co [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool										2,200,000
Average Loans to Money Pool										$ 2,100,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned										5.69%		2.11%
Minimum Interest Rate for Funds Loaned										4.66%		0.46%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned										5.35%		0.98%
Southwestern Electric Power Co [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool				$ 2,200,000						$ 2,200,000
Southwestern Electric 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										$ 25,000,000.0
Due Date										2024
Interest Rate (Percentage)				6.37%						6.37%
Southwestern Electric 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										$ 30,900,000
Due Date										2032
Interest Rate (Percentage)				4.58%						4.58%
Southwestern Electric Power Co [Member] | Other Long Term Debt Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 38,200,000
Due Date										2028
Interest Rate (Percentage)				4.68%						4.68%
Southwestern Electric Power Co [Member] | Senior Unsecured Notes Seven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									$ 350,000,000.0
Due Date										2033
Interest Rate (Percentage)				5.30%						5.30%
Southwestern Electric Power Co [Member] | Loans Payable [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]			7.53%						7.53%				0.00%
Transource Energy [Member] | Other Long Term Debt Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									$ 13,000,000.0
Due Date										2025
Interest Rate (Variable)										Variable
Transource Energy [Member] | Senior Unsecured Notes Ten
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt										$ 1,300,000
Due Date										2050
Interest Rate (Percentage)				2.75%						2.75%
Kentucky Power Co [Member] | Pollution Control Bond [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]									$ 65,000,000.0
Due Date										2026
Interest Rate (Percentage)				4.70%						4.70%
Kentucky 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										$ 65,000,000.0
Due Date										2023
Interest Rate (Percentage)				2.35%						2.35%
Maximum [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion				$ 99.95						$ 99.95
Shares Per Equity Unit				0.5003						0.5003
Minimum [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion				$ 83.29						$ 83.29
Shares Per Equity Unit				0.6003						0.6003
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,				$ (3,300,000)		$ 12,700,000	$ (17,200,000)		$ 15,200,000
Additional Paid-in Capital [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,										$ 121,000,000

[1] Pursuant to the Nuclear Waste Policy Act of 1982, I&M, a nuclear licensee, has an obligation to the United States Department of Energy for 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 $341 million and $330 million as of June 30, 2023 and December 31, 2022, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on the balance sheets.

[2] See “Equity Units” section below for additional information.

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

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

[5] Weighted-average rate as of June 30, 2023 and December 31, 2022, respectively.

[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 $360 million. The remaining affiliated amounts were immaterial.

[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $334 million. The remaining affiliated amounts were immaterial.

[9] 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.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $661 million. The remaining affiliated amounts were immaterial.

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

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Vertically Integrated Utilities was $5 million. The remaining affiliated amounts were immaterial.

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

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $19 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 $10 million. The remaining affiliated amounts were immaterial.

[20] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $11 million. The remaining affiliated amounts were immaterial.

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

[22] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $330 million. The remaining affiliated amounts were immaterial.

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

[24] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $653 million. The remaining affiliated amounts were immaterial.

[25] 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.

[26] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $19 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 $35 million primarily relating 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 $29 million primarily relating 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 APCo was $38 million primarily related to the PPA with KGPCo.

[30] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $42 million primarily related to the PPA with KGPCo.

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

[32] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $78 million primarily relating to the PPA with KGPCo.

[33] Amounts include affiliated and nonaffiliated revenues.

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

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

[36] SWEPCo’s maximum borrowings from the Utility Money Pool exceeded the authorized short-term borrowing limit by $1.6 million on March 15, 2023. On March 16, 2023, SWEPCo’s borrowings from the Utility Money Pool were reduced below the $400 million authorized limit and borrowings have continued to remain below the authorized limit.