Financing Activities (Details) - USD ($)				1 Months Ended	3 Months Ended								9 Months Ended
		Nov. 02, 2023	Mar. 15, 2023	Oct. 31, 2023	Sep. 30, 2023		Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022		Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022
Long-term Debt
Senior Unsecured Notes					$ 32,881,600,000								$ 32,881,600,000				$ 30,174,800,000
Pollution Control Bonds					1,771,000,000								1,771,000,000				1,770,200,000
Notes Payable					141,500,000								141,500,000				269,700,000
Securitization Bonds					407,000,000.0								407,000,000.0				487,800,000
Spent Nuclear Fuel Obligation	[1]				296,300,000								296,300,000				285,600,000
Junior Subordinated Notes	[2]				2,386,600,000								2,386,600,000				2,381,300,000
Other Long-term Debt					1,605,100,000								1,605,100,000				1,431,600,000
Total Long-term Debt Outstanding					39,489,100,000								39,489,100,000				36,801,000,000
Long-term Debt Due Within One Year					2,773,600,000								2,773,600,000				2,486,400,000
Long-term Debt					36,715,500,000								36,715,500,000				34,314,600,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]												4,064,000,000
Repayments of Long-term Debt													1,353,300,000		$ 1,679,100,000
Short-term Debt:
Securitized Debt for Receivables	[4]				900,000,000.0								900,000,000.0				750,000,000.0
Commercial Paper					1,826,500,000								1,826,500,000				2,862,200,000
Total Short-term Debt					$ 2,730,400,000								$ 2,730,400,000				$ 4,112,200,000
Securitized Debt for Receivables	[4],[5]				5.60%								5.60%				4.67%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable					5.55%				2.25%				5.23%		1.16%
Net Uncollectible Accounts Receivable Written Off					$ 8,800,000				$ 9,500,000				$ 22,900,000		$ 23,100,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts					1,257,000,000								1,257,000,000				$ 1,167,700,000
Total Principal Outstanding					900,000,000.0								900,000,000.0				750,000,000.0
Delinquent Securitized Accounts Receivable					59,500,000								59,500,000				44,200,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable					42,200,000								42,200,000				39,700,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable					301,800,000								301,800,000				$ 360,900,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					5,341,700,000				5,526,100,000				14,405,100,000		14,758,400,000
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													$ 959,300,000		827,200,000
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,					(6,700,000)		$ (3,300,000)	$ 12,500,000	(3,000,000.0)		$ (18,800,000)	$ 16,700,000
Commitment from Bank Conduits to Finance Receivables					750,000,000								750,000,000
Issuance of Long-term Debt													4,017,800,000		3,428,400,000
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					(508,400,000)				(425,000,000.0)				(1,416,300,000)		(1,190,500,000)
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					47,300,000				51,700,000				134,300,000		145,800,000
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					8,900,000				4,700,000				27,200,000		14,100,000
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					39,200,000				2,300,000				52,500,000		17,300,000
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]				30,300,000				17,300,000				83,900,000		36,600,000
Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					337,600,000	[7]			314,800,000	[8]			1,015,400,000	[9]	991,000,000.0	[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					(425,100,000)	[7]			(392,700,000)	[8]			(1,229,700,000)	[9]	(1,086,500,000)	[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					466,100,000	[7]			424,900,000	[8]			1,372,000,000	[9]	1,261,000,000	[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					366,000,000				342,000,000				1,100,000,000		1,000,000,000
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					120,600,000	[7]			120,300,000	[8]			348,800,000	[9]	334,400,000	[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													125,000,000		120,000,000
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					176,000,000.0	[7]			162,300,000	[8]			524,300,000	[9]	482,100,000	[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					132,300,000	[11]			138,000,000.0	[12]			314,800,000	[13]	373,800,000	[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					(48,500,000)	[11]			(31,900,000)	[12]			(132,100,000)	[13]	(71,600,000)	[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					4,800,000	[11]			(300,000)	[12]			12,700,000	[13]	(300,000)	[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					32,000,000				18,000,000
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					61,300,000	[11]			69,700,000	[12]			155,800,000	[13]	180,500,000	[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					58,200,000	[11]			74,500,000	[12]			157,100,000	[13]	194,200,000	[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					900,000	[11]			1,700,000	[12]			7,700,000	[13]	11,900,000	[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					55,600,000	[11]			24,300,000	[12]			113,600,000	[13]	59,100,000	[14]
Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					205,800,000				382,800,000				582,100,000		881,700,000	[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					(300,000)				(200,000)				(200,000)		(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					174,300,000				299,300,000				498,500,000		674,800,000	[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					31,800,000				83,700,000				83,800,000		207,000,000.0	[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					2,099,200,000				2,019,900,000				5,462,500,000		5,312,200,000
Residential [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					0				0				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					1,326,700,000				1,298,000,000				3,459,100,000		3,428,100,000
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					772,500,000				721,900,000				2,003,400,000		1,884,100,000
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					1,141,000,000				1,098,100,000				3,151,300,000		2,917,200,000
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					753,300,000				725,100,000				2,029,400,000		1,922,800,000
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					387,700,000				373,000,000.0				1,121,900,000		994,400,000
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					838,500,000				849,700,000				2,572,400,000	[16]	2,349,900,000	[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					(300,000)				(300,000)				(600,000)	[16]	(700,000)	[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				0				0	[16]	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					699,900,000				658,500,000				2,069,100,000	[16]	1,863,300,000	[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					138,900,000				191,500,000				503,900,000	[16]	487,300,000	[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				0				0	[16]	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				0				0	[16]	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					79,600,000				69,300,000				219,700,000		194,000,000.0
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					66,600,000				54,300,000				182,300,000		154,600,000
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					13,000,000.0				15,000,000.0				37,400,000		39,400,000
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					4,158,300,000				4,037,000,000				11,405,900,000		10,773,300,000
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					(300,000)				(300,000)				(600,000)		(700,000)
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					2,846,500,000				2,735,900,000				7,739,900,000		7,368,800,000
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					1,312,100,000				1,301,400,000				3,666,600,000		3,405,200,000
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					17,300,000	[17]			41,800,000	[18]			68,500,000	[16]	98,700,000	[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					(2,500,000)	[17]			(2,500,000)	[18]			(5,700,000)	[16]	(6,200,000)	[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	[17]			0	[18]			0	[16]	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	[17]			0	[18]			0	[16]	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	[17]			0	[18]			0	[16]	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					19,800,000	[17]			44,300,000	[18]			74,200,000	[16]	104,900,000	[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	[17]			0	[18]			0	[16]	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					474,900,000	[19]			485,300,000				1,287,200,000	[20]	1,275,600,000	[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					(36,700,000)	[19]			200,000				(46,700,000)	[20]	(11,100,000)	[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				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				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				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					510,800,000	[19]			482,900,000				1,332,200,000	[20]	1,280,000,000	[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					37,000,000								47,000,000		11,000,000
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					800,000	[19]			2,200,000				1,700,000	[20]	6,700,000	[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					1,035,600,000				1,224,700,000				2,953,200,000		3,247,000,000
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					(464,600,000)				(395,200,000)				(1,282,300,000)		(1,103,900,000)
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					466,100,000				424,900,000				1,372,000,000		1,261,000,000
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					294,900,000				419,600,000				847,300,000		1,009,200,000
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					176,000,000.0				162,300,000				524,300,000		482,100,000
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					562,400,000				610,900,000				1,490,200,000		1,591,900,000
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					800,000				2,200,000				1,700,000		6,700,000
Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					5,326,200,000				5,399,700,000				14,673,900,000		14,394,100,000
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					(513,400,000)				(427,400,000)				(1,415,000,000)		(1,176,200,000)
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					470,900,000				424,600,000				1,384,700,000		1,260,700,000
Affiliated and Nonaffiliated [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					3,202,700,000				3,225,200,000				8,743,000,000		8,558,500,000
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					1,546,300,000				1,538,200,000				4,348,000,000		4,081,500,000
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					563,300,000				612,600,000				1,497,900,000		1,603,800,000
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					56,400,000				26,500,000				115,300,000		65,800,000
Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					120,900,000				92,900,000				307,800,000		280,500,000
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													87,000,000		36,000,000
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]				26,900,000				11,000,000.0				$ 35,400,000		36,100,000
2020 Equity Units [Member]
Financing Activities (Textuals)
Stock Issued During Period, Shares, New Issues													10,048,668
Issuance of Common Stock													$ 850,000,000
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
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%
Senior Unsecured Notes Eight
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													$ 600,000,000.0
Due Date													2023
Interest Rate (Variable)													Variable
Senior Unsecured Notes Twelve | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		$ 450,000,000
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]				5.64%								5.64%				4.80%
Term Loan [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]				0.00%								0.00%				5.17%
Term Loan					$ 0								$ 0				$ 125,000,000.0
Term Loan 2 [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]				0.00%								0.00%				5.17%
Term Loan					$ 0								$ 0				$ 150,000,000.0
Term Loan 4
Short-term Debt:
Weighted Average Interest Rate	[5]				0.00%								0.00%				5.23%
Term Loan					$ 0								$ 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					5,926,700,000								5,926,700,000				5,657,800,000
Long-term Debt Due Within One Year					94,900,000								94,900,000				278,500,000
Long-term Debt					5,831,800,000								5,831,800,000				5,379,300,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													$ 240,000,000.0		678,600,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization													67.50%
Issuance of Long-term Debt													$ 505,400,000		1,188,700,000
AEP Texas Inc. [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool					0								0				96,500,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					1,200,000				900,000				3,700,000		2,600,000
Financing Activities (Textuals)
Net Loans To Money Pool					49,000,000.0								49,000,000.0				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					154,600,000	[22]			140,800,000	[23]			464,000,000.0	[24]	417,700,000	[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					8,800,000	[26]			9,500,000	[27]			29,200,000	[28]	24,400,000	[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					236,200,000				204,000,000.0				511,800,000		520,800,000
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					112,400,000				107,100,000				310,300,000		312,600,000
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					35,400,000				35,400,000				109,900,000	[34]	102,600,000	[35]
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					9,200,000				11,500,000				26,200,000		29,200,000
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					393,200,000				358,000,000.0				958,200,000		965,200,000
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					154,600,000				140,800,000				464,000,000.0		417,700,000
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					556,600,000				508,300,000				1,451,400,000		1,407,300,000
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					1,800,000				300,000				$ 2,900,000		$ 2,500,000
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate													5.81%		3.39%
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													42,000,000.0
Average Borrowings from Money Pool													250,400,000
Average Loans to Money Pool													42,000,000.0
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													5.44%		0.90%
Average Interest Rate For Funds Loaned													5.70%		1.82%
AEP Texas Inc. [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool					42,000,000.0								$ 42,000,000.0
AEP Texas Inc. [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool													7,000,000.0
Average Loans to Money Pool													$ 6,900,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned													5.81%		3.39%
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													5.47%		1.51%
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] | Pollution Control Bond [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]												$ 60,000,000.0
Due Date													2030
Interest Rate (Percentage)					4.25%								4.25%
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													$ 23,500,000
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] | Pollution Control Bond Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													$ 60,000,000.0
Due Date													2023
Interest Rate (Percentage)					0.90%								0.90%
AEP Texas Inc. [Member] | Senior Unsecured Notes Nine
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					$ 5,473,700,000								$ 5,473,700,000				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					5,413,700,000								5,413,700,000				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					0.90%								0.90%
Maximum Percentage Debt to Capitalization													67.50%
Issuance of Long-term Debt													$ 689,000,000.0		$ 540,900,000
AEP Transmission Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool					$ 116,800,000								116,800,000				229,300,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					374,700,000				340,600,000				1,097,900,000		999,500,000
Financing Activities (Textuals)
Net Loans To Money Pool					90,600,000								90,600,000				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					454,700,000	[22]			411,700,000	[23]			1,338,100,000	[24]	1,218,100,000	[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					363,000,000				339,000,000				1,100,000,000		992,000,000
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					5,000,000.0	[26]			(300,000)	[27]			12,800,000	[28]	(400,000)	[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				0				0	[34]	0	[35]
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					454,700,000				411,700,000				1,338,100,000		1,218,100,000
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					459,700,000				411,400,000				$ 1,350,900,000		$ 1,217,700,000
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate													5.81%		3.39%
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													134,300,000
Average Loans to Money Pool													76,000,000.0
Authorized Short Term Borrowing Limit	[36]												$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed													5.29%		1.03%
Average Interest Rate For Funds Loaned													5.52%		2.14%
AEP Transmission Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool					7,200,000								$ 7,200,000
AEP Transmission Co [Member] | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool													37,900,000
Maximum Loans to Money Pool													158,100,000
Average Borrowings from Money Pool													3,000,000.0
Average Loans to Money Pool													67,500,000
Borrowings from Parent					33,400,000								33,400,000
Loans to Parent					$ 0								0
Authorized Short Term Borrowing Limit	[37]												$ 50,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed													5.81%		3.39%
Minimum Interest Rate For Funds Borrowed													4.53%		0.46%
Maximum Interest Rate For Funds Loaned													5.81%		3.37%
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													5.43%		1.56%
Average Interest Rate For Funds Loaned													5.46%		1.38%
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					$ 5,587,300,000								$ 5,587,300,000				5,410,500,000
Long-term Debt Due Within One Year					538,800,000								538,800,000				251,800,000
Long-term Debt					5,048,500,000								5,048,500,000				5,158,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													26,500,000		$ 130,400,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues					170,500,000								170,500,000				194,400,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit					451,600,000				360,400,000				$ 1,372,700,000		1,114,900,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization													67.50%
Issuance of Long-term Debt													$ 200,000,000.0		698,200,000
Appalachian Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool					202,500,000								202,500,000				182,200,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					62,500,000				67,600,000				193,200,000		187,600,000
Financing Activities (Textuals)
Net Loans To Money Pool					19,300,000								19,300,000				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					45,500,000	[22]			41,500,000	[23]			130,800,000	[24]	123,400,000	[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								64,000,000
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					35,200,000	[26]			33,700,000	[27]			60,000,000.0	[28]	78,600,000	[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					79,400,000	[30]			107,900,000	[31]			223,800,000	[32]	227,600,000	[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				44,000,000				121,000,000		122,000,000
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					397,100,000				360,500,000				1,192,400,000		1,131,700,000
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					181,300,000				161,100,000				516,200,000		467,600,000
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					197,100,000				163,300,000				575,400,000	[34]	479,000,000.0	[35]
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					26,800,000				20,600,000				78,200,000		61,400,000
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					802,300,000				705,500,000				2,362,200,000		2,139,700,000
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					124,900,000				149,400,000				354,600,000		351,000,000.0
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					962,400,000				888,600,000				2,776,800,000		2,569,300,000
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					3,300,000				2,900,000				9,800,000		11,800,000
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					4,100,000				2,800,000				$ 13,300,000		$ 5,600,000
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate													5.81%		3.39%
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													280,800,000
Average Loans to Money Pool													19,000,000.0
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													5.47%		1.39%
Average Interest Rate For Funds Loaned													5.47%		2.13%
Appalachian Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool					$ (183,200,000)								$ (183,200,000)
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													$ 16,800,000
Due Date													2028
Interest Rate (Percentage)					3.77%								3.77%
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding					$ 3,443,600,000								$ 3,443,600,000				3,260,800,000
Long-term Debt Due Within One Year					61,800,000								61,800,000				341,800,000
Long-term Debt					3,381,800,000								3,381,800,000				2,919,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													324,100,000		$ 64,500,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues					176,200,000								176,200,000				166,900,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit					553,300,000				558,500,000				1,575,900,000		1,574,300,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition					345,000,000								$ 345,000,000				330,000,000
Maximum Percentage Debt to Capitalization													67.50%
Issuance of Long-term Debt													$ 494,800,000		72,800,000
Indiana Michigan Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool					0								0				249,900,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					600,000				2,000,000.0				3,700,000		11,100,000
Financing Activities (Textuals)
Net Loans To Money Pool					21,200,000								21,200,000				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					10,400,000	[22]			8,800,000	[23]			28,100,000	[24]	26,300,000	[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					26,200,000	[26]			30,600,000	[27]			92,600,000	[28]	86,300,000	[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					18,000,000				15,000,000				52,000,000		44,000,000
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					90,200,000	[30]			126,300,000	[31]			257,700,000	[32]	310,900,000	[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					230,700,000				238,600,000				655,500,000		665,600,000
Indiana Michigan Power Co [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					159,200,000				154,300,000				439,500,000		419,500,000
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					159,100,000				155,600,000				467,600,000	[34]	452,100,000	[35]
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				3,800,000		3,700,000
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					550,300,000				549,700,000				1,566,400,000		1,540,900,000
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					100,600,000				135,100,000				285,800,000		337,200,000
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					677,100,000				715,400,000				1,944,800,000		1,964,400,000
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					4,200,000				4,400,000				9,700,000		10,000,000.0
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					15,400,000				13,300,000				45,800,000		38,400,000
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					4,400,000				2,800,000				$ 12,200,000		$ 6,500,000
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate													5.81%		3.39%
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													112,200,000
Average Borrowings from Money Pool													126,000,000.0
Average Loans to Money Pool													49,300,000
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													5.13%		1.38%
Average Interest Rate For Funds Loaned													5.54%		1.46%
Indiana Michigan Power Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool					$ 21,200,000								$ 21,200,000
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Four [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													$ 12,000,000.0
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													$ 20,600,000
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													$ 20,500,000
Due Date													2027
Interest Rate (Percentage)					5.93%								5.93%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Seven [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 4,000,000
Indiana Michigan Power Co [Member] | OtherLongTermDebtThree
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													$ 1,700,000
Due Date													2025
Interest Rate (Percentage)					6.00%								6.00%
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													$ 1,800,000
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													$ 3,700,000
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													$ 13,800,000
Due Date													2025
Interest Rate (Variable)													Variable
Indiana Michigan Power Co [Member] | Senior Unsecured Notes Ten
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					$ 3,366,200,000								$ 3,366,200,000				2,970,300,000
Long-term Debt Due Within One Year					0								0				100,000
Long-term Debt					3,366,200,000								3,366,200,000				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					479,300,000								479,300,000				478,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit					850,300,000				874,100,000				2,518,600,000		2,284,000,000
Financing Activities (Textuals)
Issuance of Long-term Debt													395,000,000.0		0
Ohio Power Co [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool					113,300,000								113,300,000				172,900,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					7,800,000				4,000,000.0				23,600,000		11,600,000
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					21,400,000	[22]			21,500,000	[23]			60,300,000	[24]	64,400,000	[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					49,200,000	[26]			64,800,000	[27]			127,900,000	[28]	169,600,000	[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					536,300,000				517,900,000				1,491,600,000		1,363,300,000
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					275,300,000				266,100,000				811,600,000		681,900,000
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					103,600,000				156,100,000				394,000,000.0	[34]	384,800,000	[35]
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					3,800,000				3,500,000				11,200,000		10,200,000
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					919,000,000.0				943,600,000				2,708,400,000		2,440,200,000
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					21,400,000				21,500,000				60,300,000		64,400,000
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					989,600,000				1,029,900,000				2,896,600,000		2,674,200,000
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					3,000,000.0				2,100,000				10,300,000		6,000,000.0
Ohio Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					7,400,000				7,300,000				$ 22,300,000		$ 22,200,000
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate													5.81%		3.39%
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													207,100,000
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													5.37%		1.81%
Average Interest Rate For Funds Loaned													5.60%		1.22%
Ohio Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool					$ (113,300,000)								$ (113,300,000)
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					$ 2,384,200,000								$ 2,384,200,000				1,912,800,000
Long-term Debt Due Within One Year					600,000								600,000				500,000
Long-term Debt					2,383,600,000								2,383,600,000				1,912,300,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													400,000		$ 500,400,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues					211,500,000								211,500,000				155,500,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit					633,800,000				588,500,000				$ 1,510,300,000		1,380,400,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization													67.50%
Issuance of Long-term Debt													$ 469,800,000		499,700,000
Public Service Co Of Oklahoma [Member] | Related Party
Short-term Debt:
Net Borrowings from Money Pool					0								0				364,200,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					200,000				700,000				1,000,000.0		2,100,000
Financing Activities (Textuals)
Net Loans To Money Pool					9,200,000								9,200,000				0
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					10,800,000	[22]			10,200,000	[23]			32,000,000.0	[24]	28,900,000	[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					5,400,000	[26]			6,400,000	[27]			14,900,000	[28]	21,400,000	[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					(4,900,000)	[30]			9,400,000	[31]			300,000	[32]	19,200,000	[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					310,500,000				299,600,000				667,900,000		650,700,000
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					171,900,000				153,400,000				412,700,000		372,100,000
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					114,100,000				98,900,000				320,200,000	[34]	270,000,000.0	[35]
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					33,800,000				30,100,000				86,300,000		77,100,000
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					630,300,000				582,000,000.0				1,487,100,000		1,369,900,000
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					5,900,000				19,600,000				32,300,000		48,100,000
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					641,600,000				608,000,000.0				1,534,300,000		1,439,400,000
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					1,400,000				1,000,000.0				5,100,000		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					4,600,000				2,400,000				$ 11,300,000		$ 4,600,000
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate													5.81%		3.39%
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													106,300,000
Average Loans to Money Pool													53,900,000
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													5.48%		1.70%
Average Interest Rate For Funds Loaned													5.24%		0.75%
Public Service Co Of Oklahoma [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool					$ 9,200,000								$ 9,200,000
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													$ 400,000
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					$ 3,646,200,000								$ 3,646,200,000				3,391,600,000
Long-term Debt Due Within One Year					0								0				6,200,000
Long-term Debt					3,646,200,000								3,646,200,000				3,385,400,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													94,100,000		$ 4,700,000
Short-term Debt:
Notes Payable					3,900,000								3,900,000				0
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues					210,200,000								210,200,000				194,000,000.0
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit					558,400,000				593,600,000				$ 1,456,500,000		1,425,300,000
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					48,900,000								48,900,000				310,700,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					14,500,000				18,200,000				40,700,000		43,700,000
Financing Activities (Textuals)
Net Loans To Money Pool					2,700,000								2,700,000				$ 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					42,400,000	[22]			42,300,000	[23]			123,600,000	[24]	116,800,000	[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					17,000,000								43,000,000
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					6,000,000.0	[26]			7,600,000	[27]			20,900,000	[28]	18,900,000	[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					36,800,000	[30]			87,600,000	[31]			120,300,000	[32]	206,200,000	[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					286,500,000				285,500,000				647,500,000		650,000,000.0
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					174,900,000				182,300,000				472,200,000		458,800,000
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					105,500,000				108,300,000				320,300,000	[34]	290,100,000	[35]
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					2,400,000				600,000				7,600,000		7,400,000
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					569,300,000				576,700,000				1,447,600,000		1,406,300,000
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					79,200,000				129,900,000				243,900,000		323,000,000.0
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					654,500,000				714,200,000				1,712,400,000		1,748,200,000
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					500,000				500,000				1,800,000		1,500,000
Southwestern Electric Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold					5,200,000				3,200,000				$ 13,900,000		$ 6,000,000.0
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate													5.81%		3.39%
Minimum Interest Rate													4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool	[38]												$ 401,600,000
Maximum Loans to Money Pool													25,800,000
Average Borrowings from Money Pool													165,300,000
Average Loans to Money Pool													16,500,000
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													5.25%		1.67%
Average Interest Rate For Funds Loaned													5.72%		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					(48,900,000)								$ (48,900,000)
Southwestern Electric Power Co [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool													2,700,000
Average Loans to Money Pool													$ 2,300,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned													5.81%		3.39%
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													5.49%		1.52%
Southwestern Electric Power Co [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool					$ 2,700,000								$ 2,700,000
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]				7.67%								7.67%				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]												$ 14,000,000.0
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				$ 3,500,000
Transource Energy [Member] | Senior Unsecured Notes Eleven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt													$ 2,600,000
Due Date													2050
Interest Rate (Percentage)					2.75%								2.75%
Kentucky Power Co [Member] | Pollution Control Bond Two [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 Four
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%
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,					$ (6,700,000)		$ (3,300,000)	$ 12,700,000	$ (3,000,000.0)		$ (17,200,000)	$ 15,200,000

[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 $345 million and $330 million as of September 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 September 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 $366 million. The remaining affiliated amounts were immaterial.

[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $342 million. The remaining affiliated amounts were immaterial.

[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.1 billion. The affiliated revenue for Vertically Integrated Utilities was $125 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1 billion. The affiliated revenue for Vertically Integrated Utilities was $120 million. The remaining affiliated amounts were immaterial.

[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $32 million. The remaining affiliated amounts were immaterial.

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $18 million. The remaining affiliated amounts were immaterial.

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $87 million. The remaining affiliated amounts were immaterial.

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $36 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 $37 million. The remaining affiliated amounts were immaterial.

[20] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $47 million. The remaining affiliated amounts were immaterial.

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

[22] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $363 million, APCo was $22 million and SWEPCo was $17 million. The remaining affiliated amounts were immaterial.

[23] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $339 million. The remaining affiliated amounts were immaterial.

[24] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.1 billion, APCo was $64 million and SWEPCo was $43 million. The remaining affiliated amounts were immaterial.

[25] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $992 million. The remaining affiliated amounts were immaterial.

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

[27] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $15 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 $52 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 I&M was $44 million primarily relating 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 $44 million primarily related to the PPA with KGPCo.

[32] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $121 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[33] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $122 million primarily relating to the PPA with KGPCo.

[34] Amounts include affiliated and nonaffiliated revenues.

[35] Amounts include affiliated and nonaffiliated revenues.

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

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

[38] 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.