Financing Activities (Details) - USD ($)		1 Months Ended	3 Months Ended								9 Months Ended
		Oct. 31, 2024	Sep. 30, 2024		Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023		Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024		Sep. 30, 2023		Dec. 31, 2023
Long-term Debt
Senior Unsecured Notes			$ 35,771,200,000								$ 35,771,200,000				$ 33,779,400,000
Pollution Control Bonds			1,770,400,000								1,770,400,000				1,771,600,000
Notes Payable			644,300,000								644,300,000				193,300,000
Securitization Bonds			285,700,000								285,700,000				368,900,000
Spent Nuclear Fuel Obligation	[1]		312,700,000								312,700,000				300,400,000
Junior Subordinated Notes			2,578,000,000								2,578,000,000				2,388,100,000
Other Long-term Debt			612,100,000								612,100,000				1,341,500,000
Total Long-term Debt Outstanding			41,974,400,000								41,974,400,000				40,143,200,000
Long-term Debt Due Within One Year			2,826,700,000								2,826,700,000				2,490,500,000
Long-term Debt			39,147,700,000								39,147,700,000				37,652,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										3,786,400,000
Repayments of Long-term Debt											1,969,100,000		$ 1,353,300,000
Short-term Debt:
Securitized Debt for Receivables	[3]		900,000,000.0								900,000,000.0				888,000,000.0
Commercial Paper			755,000,000.0								755,000,000.0				1,937,900,000
Total Short-term Debt			$ 1,659,600,000								$ 1,659,600,000				$ 2,830,200,000
Securitized Debt for Receivables	[3],[4]		5.32%								5.32%				5.65%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable			5.50%				5.55%				5.54%		5.23%
Net Uncollectible Accounts Receivable Written Off			$ 8,400,000				$ 8,800,000				$ 22,300,000		$ 22,900,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts			1,285,400,000								1,285,400,000				$ 1,207,400,000
Total Principal Outstanding			900,000,000.0								900,000,000.0				888,000,000.0
Delinquent Securitized Accounts Receivable			66,400,000								66,400,000				52,200,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable			44,900,000								44,900,000				42,000,000.0
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable			327,400,000								327,400,000				$ 409,800,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			5,420,100,000				5,341,700,000				15,025,000,000		14,405,100,000
Financing Activities (Textuals)
Maximum Value of Shares to be Issued Under ATM Program											$ 1,700,000,000
Maximum Percentage Paid to Selling Agents											2.00%
Stock Issued During Period, Shares, New Issues											4,437,136
Issuance of Common Stock											$ 513,000,000.0		959,300,000
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,			(2,500,000)		$ (1,100,000)	$ 14,800,000	(6,700,000)		$ (3,300,000)	$ 12,500,000
Issuance of Long-term Debt											3,748,500,000		4,017,800,000
Fixed Performance Obligations			302,400,000								302,400,000
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
2024 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			23,100,000								23,100,000
2025-2026[Member]
Financing Activities (Textuals)
Fixed Performance Obligations			169,000,000.0								169,000,000.0
2027-2028 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			85,400,000								85,400,000
After 2028
Financing Activities (Textuals)
Fixed Performance Obligations			24,900,000								24,900,000
Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0				0				0		0
Reconciling Adjustments [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	[5]		(508,000,000.0)				(508,400,000)				(1,524,800,000)		(1,416,300,000)
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			54,200,000				47,300,000				147,900,000		134,300,000
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			6,900,000				8,900,000				21,000,000.0		27,200,000
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			15,400,000				39,200,000				88,000,000.0		52,500,000
Other Operating Segment [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	[6]		32,100,000				30,300,000				100,500,000		83,900,000
Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			390,800,000	[7]			337,600,000	[8]			1,190,500,000	[9]	1,015,400,000	[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			(439,400,000)	[7]			(425,100,000)	[8]			(1,255,000,000)	[9]	(1,229,700,000)	[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			505,500,000	[7]			466,100,000	[8]			1,490,800,000	[9]	1,372,000,000	[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			402,000,000				366,000,000				1,200,000,000		1,100,000,000
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			129,600,000	[7]			120,600,000	[8]			371,500,000	[9]	348,800,000	[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			51,000,000								133,000,000		125,000,000
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			195,100,000	[7]			176,000,000.0	[8]			583,200,000	[9]	524,300,000	[10]
Wholesale Transmission [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[7]			0	[8]			0	[9]	0	[10]
Wholesale Transmission [Member] | Other Operating Segment [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			125,900,000	[11]			132,300,000	[12]			337,600,000	[13]	314,800,000	[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			(53,400,000)	[11]			(48,500,000)	[12]			(170,900,000)	[13]	(132,100,000)	[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			5,800,000	[11]			4,800,000	[12]			20,100,000	[13]	12,700,000	[14]
Other Revenues [Member] | Corporate Segment and Other Operating Segment | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			34,000,000				32,000,000
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			76,200,000	[11]			61,300,000	[12]			183,300,000	[13]	155,800,000	[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			58,900,000	[11]			58,200,000	[12]			148,800,000	[13]	157,100,000	[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			800,000	[11]			900,000	[12]			3,100,000	[13]	7,700,000	[14]
Other Revenues [Member] | Other Operating Segment [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			37,600,000	[11]			55,600,000	[12]			153,200,000	[13]	113,600,000	[14]
Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			228,000,000.0				205,800,000				664,000,000.0		582,100,000
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				(300,000)				100,000		(200,000)
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			202,500,000				174,300,000				587,400,000		498,500,000
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			25,400,000				31,800,000				76,500,000		83,800,000
Wholesale Generation [Member] | Other Operating Segment [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			2,136,600,000				2,099,200,000				5,651,900,000		5,462,500,000
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			1,362,900,000				1,326,700,000				3,524,200,000		3,459,100,000
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			773,700,000				772,500,000				2,127,700,000		2,003,400,000
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 Operating Segment [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			1,172,600,000				1,141,000,000				3,255,600,000		3,151,300,000
Commercial [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0				0				0		0
Commercial [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0				0				0		0
Commercial [Member] | Vertically Integrated Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			776,100,000				753,300,000				2,071,000,000		2,029,400,000
Commercial [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			396,500,000				387,700,000				1,184,600,000		1,121,900,000
Commercial [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0				0				0		0
Commercial [Member] | Other Operating Segment [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			816,000,000.0	[15]			838,500,000				2,374,700,000	[16]	2,572,400,000	[17]
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)	[15]			(300,000)				(600,000)	[16]	(600,000)	[17]
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	[15]			0				0	[16]	0	[17]
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			692,600,000	[15]			699,900,000				1,992,500,000	[16]	2,069,100,000	[17]
Industrial [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			123,700,000	[15]			138,900,000				382,800,000	[16]	503,900,000	[17]
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	[15]			0				0	[16]	0	[17]
Industrial [Member] | Other Operating Segment [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[15]			0				0	[16]	0	[17]
Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			77,700,000				79,600,000				216,400,000		219,700,000
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			63,800,000				66,600,000				174,900,000		182,300,000
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			13,900,000				13,000,000.0				41,500,000		37,400,000
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 Operating Segment [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			4,202,900,000				4,158,300,000				11,498,600,000		11,405,900,000
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)		(600,000)
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			2,895,400,000				2,846,500,000				7,762,600,000		7,739,900,000
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			1,307,800,000				1,312,100,000				3,736,600,000		3,666,600,000
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 Operating Segment [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			7,200,000	[15]			17,300,000	[18]			18,900,000	[16]	68,500,000	[17]
Renewable Generation [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(1,500,000)	[15]			(2,500,000)	[18]			(4,300,000)	[16]	(5,700,000)	[17]
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	[15]			0	[18]			0	[16]	0	[17]
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	[15]			0	[18]			0	[16]	0	[17]
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	[15]			0	[18]			0	[16]	0	[17]
Renewable Generation [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			8,700,000	[15]			19,800,000	[18]			23,200,000	[16]	74,200,000	[17]
Renewable Generation [Member] | Other Operating Segment [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0	[15]			0	[18]			0	[16]	0	[17]
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			515,300,000	[19]			474,900,000	[20]			1,503,100,000	[21]	1,287,200,000	[22]
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			(13,800,000)	[19]			(36,700,000)	[20]			(83,700,000)	[21]	(46,700,000)	[22]
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	[20]			0	[21]	0	[22]
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	[20]			0	[21]	0	[22]
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	[20]			0	[21]	0	[22]
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			529,300,000	[19]			510,800,000	[20]			1,586,200,000	[21]	1,332,200,000	[22]
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			14,000,000				37,000,000				84,000,000		47,000,000
Retail, Trading and Marketing Revenues [Member] | Other Operating Segment [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(200,000)	[19]			800,000	[20]			600,000	[21]	1,700,000	[22]
Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,141,300,000				1,035,600,000				3,376,500,000		2,953,200,000
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			(454,600,000)				(464,600,000)				(1,342,900,000)		(1,282,300,000)
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			505,500,000				466,100,000				1,490,800,000		1,372,000,000
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			332,100,000				294,900,000				958,900,000		847,300,000
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			195,100,000				176,000,000.0				583,200,000		524,300,000
Wholesale and Competitive [Member] | Generation And Marketing [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			563,400,000				562,400,000				1,685,900,000		1,490,200,000
Wholesale and Competitive [Member] | Other Operating Segment [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			(200,000)				800,000				600,000		1,700,000
Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			5,470,100,000				5,326,200,000				15,212,700,000		14,673,900,000
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			(508,300,000)				(513,400,000)				(1,514,400,000)		(1,415,000,000)
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			511,300,000				470,900,000				1,510,900,000		1,384,700,000
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			3,303,700,000				3,202,700,000				8,904,800,000		8,743,000,000
Affiliated and Nonaffiliated [Member] | Transmission And Distribution Utilities [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,561,800,000				1,546,300,000				4,468,600,000		4,348,000,000
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			564,200,000				563,300,000				1,689,000,000		1,497,900,000
Affiliated and Nonaffiliated [Member] | Other Operating Segment [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			37,400,000				56,400,000				153,800,000		115,300,000
Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			119,100,000				120,900,000				380,400,000		307,800,000
Other Revenues [Member] | Corporate Segment and Other Operating Segment | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold											112,000,000		87,000,000
Other Revenues [Member] | Other Operating Segment [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold	[6]		$ 6,000,000.0				26,900,000				48,100,000		35,400,000
Equity Distribution Agreement
Financing Activities (Textuals)
Issuance of Common Stock											397,000,000
Junior Subordinated Notes
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 600,000,000.0
Due Date											2054
Interest Rate (Percentage)			6.95%								6.95%
Junior Subordinates Notes Two
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 400,000,000.0
Due Date											2054
Interest Rate (Percentage)			7.05%								7.05%
Junior Subordinates Notes Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 805,000,000.0
Due Date											2024
Interest Rate (Percentage)			2.03%								2.03%
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	[4]		5.26%								5.26%				5.69%
AEP Texas Inc. [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 6,479,400,000								$ 6,479,400,000				$ 5,889,800,000
Long-term Debt Due Within One Year			113,900,000								113,900,000				96,000,000.0
Long-term Debt			6,365,500,000								6,365,500,000				5,793,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 256,500,000		240,000,000.0
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 841,900,000		505,400,000
AEP Texas Inc. [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			0								0				(103,700,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,300,000				1,200,000				4,000,000.0		3,700,000
Financing Activities (Textuals)
Net Loans To Money Pool			61,800,000								61,800,000				7,100,000
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			170,600,000	[23]			154,600,000	[24]			511,300,000	[25]	464,000,000.0	[26]
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			8,200,000	[27]			8,800,000	[28]			27,400,000	[29]	29,200,000	[30]
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	[31]			0	[32]			0	[33]	0	[34]
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			230,200,000				236,200,000				562,400,000		511,800,000
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			120,300,000				112,400,000				346,200,000		310,300,000
AEP Texas Inc. [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			33,700,000	[35]			35,400,000				103,300,000	[36]	109,900,000	[37]
AEP Texas Inc. [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			9,700,000				9,200,000				28,700,000		26,200,000
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			393,900,000				393,200,000				1,040,600,000		958,200,000
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			170,600,000				154,600,000				511,300,000		464,000,000.0
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			572,700,000				556,600,000				1,579,300,000		1,451,400,000
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			700,000				1,800,000				$ 3,300,000		$ 2,900,000
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate											5.79%		5.81%
Minimum Interest Rate											5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 374,600,000
Maximum Loans to Money Pool											274,300,000
Average Borrowings from Money Pool											237,000,000.0
Average Loans to Money Pool											203,100,000
Authorized Short Term Borrowing Limit											$ 600,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											5.69%		5.44%
Average Interest Rate For Funds Loaned											5.48%		5.70%
AEP Texas Inc. [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			54,700,000								$ 54,700,000
AEP Texas Inc. [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool											7,100,000
Average Loans to Money Pool											$ 7,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned											5.79%		5.81%
Minimum Interest Rate for Funds Loaned											5.25%		4.66%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned											5.64%		5.47%
AEP Texas Inc. [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 7,100,000								$ 7,100,000
AEP Texas Inc. [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 32,600,000
Due Date											2024
Interest Rate (Percentage)			2.85%								2.85%
AEP Texas Inc. [Member] | Securitization Bonds Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 23,900,000
Due Date											2025
Interest Rate (Percentage)			2.06%								2.06%
AEP Texas Inc. [Member] | Senior Unsecured Notes Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 500,000,000.0
Due Date											2029
Interest Rate (Percentage)			5.45%								5.45%
AEP Texas Inc. [Member] | OtherLongTermDebtThree
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 200,000,000.0
Due Date											2025
Interest Rate (Variable)											Variable
AEP Texas Inc. [Member] | Senior Unsecured Notes Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 350,000,000.0
Due Date											2034
Interest Rate (Percentage)			5.70%								5.70%
AEP Transmission Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 5,862,300,000								$ 5,862,300,000				5,414,400,000
Long-term Debt Due Within One Year			185,000,000.0								185,000,000.0				95,000,000.0
Long-term Debt			5,677,300,000								5,677,300,000				5,319,400,000
Financing Activities (Textuals)
Sub-Limit of Secured Debt			$ 50,000,000								$ 50,000,000
Maximum Percentage of Consolidated Tangible Net Assets			10.00%								10.00%
Tangible Capital to Tangible Assets			0.30%								0.30%
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 445,700,000		$ 689,000,000.0
AEP Transmission Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			$ (42,800,000)								(42,800,000)				(174,300,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			404,400,000				374,700,000				1,188,200,000		1,097,900,000
Financing Activities (Textuals)
Net Loans To Money Pool			181,800,000								181,800,000				67,100,000
AEP Transmission Co [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0				0				0		0
AEP Transmission Co [Member] | Reconciling Adjustments [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0				0				0		0
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			491,900,000	[23]			454,700,000	[24]			1,450,500,000	[25]	1,338,100,000	[26]
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			399,000,000				363,000,000				1,200,000,000		1,100,000,000
AEP Transmission Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			6,000,000.0	[27]			5,000,000.0	[28]			20,300,000	[29]	12,800,000	[30]
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	[31]			0	[32]			0	[33]	0	[34]
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	[35]			0				0	[36]	0	[37]
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			491,900,000				454,700,000				1,450,500,000		1,338,100,000
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			497,900,000				459,700,000				1,470,800,000		1,350,900,000
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			200,000				0				3,000,000.0		$ 0
AEP Transmission Co [Member] | Other Revenues [Member] | Reconciling Adjustments [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			0								$ 0
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate											5.79%		5.81%
Minimum Interest Rate											5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 313,300,000
Maximum Loans to Money Pool											332,000,000.0
Average Borrowings from Money Pool											75,700,000
Average Loans to Money Pool											159,200,000
Authorized Short Term Borrowing Limit	[38]										$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											5.68%		5.29%
Average Interest Rate For Funds Loaned											5.58%		5.52%
AEP Transmission Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			152,600,000								$ 152,600,000
AEP Transmission Co [Member] | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											49,400,000
Maximum Loans to Money Pool											148,500,000
Average Borrowings from Money Pool											15,300,000
Average Loans to Money Pool											69,800,000
Borrowings from Parent			11,800,000								11,800,000
Loans to Parent			$ 0								0
Authorized Short Term Borrowing Limit	[39]										$ 0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed											5.79%		5.81%
Minimum Interest Rate For Funds Borrowed											5.25%		4.53%
Maximum Interest Rate For Funds Loaned											5.79%		5.81%
Minimum Interest Rate for Funds Loaned											5.25%		4.53%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											5.66%		5.43%
Average Interest Rate For Funds Loaned											5.63%		5.46%
AEP Transmission Co [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 450,000,000.0
Due Date											2034
Interest Rate (Percentage)			5.15%								5.15%
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 5,659,200,000								$ 5,659,200,000				5,588,300,000
Long-term Debt Due Within One Year			748,600,000								748,600,000				538,800,000
Long-term Debt			4,910,600,000								4,910,600,000				5,049,500,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											413,500,000		$ 26,500,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			178,500,000								178,500,000				184,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			504,600,000				451,600,000				$ 1,487,900,000		1,372,700,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 480,800,000		200,000,000.0
Fixed Performance Obligations			74,200,000								74,200,000
Appalachian Power Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			(900,000)								(900,000)				(339,600,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			65,200,000				62,500,000				183,100,000		193,200,000
Financing Activities (Textuals)
Net Loans To Money Pool			18,900,000								18,900,000				18,900,000
Appalachian Power Co [Member] | 2024 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			4,000,000.0								4,000,000.0
Appalachian Power Co [Member] | 2025-2026[Member]
Financing Activities (Textuals)
Fixed Performance Obligations			32,100,000								32,100,000
Appalachian Power Co [Member] | 2027-2028 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			26,500,000								26,500,000
Appalachian Power Co [Member] | After 2028
Financing Activities (Textuals)
Fixed Performance Obligations			11,600,000								11,600,000
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			45,600,000	[23]			45,500,000	[24]			138,300,000	[25]	130,800,000	[26]
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				22,000,000				65,000,000		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			36,200,000	[27]			35,200,000	[28]			71,000,000.0	[29]	60,000,000.0	[30]
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			78,700,000	[31]			79,400,000	[32]			235,900,000	[33]	223,800,000	[34]
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			41,000,000				36,000,000				118,000,000		121,000,000
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			442,600,000				397,100,000				1,333,700,000		1,192,400,000
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			196,400,000				181,300,000				571,800,000		516,200,000
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			201,200,000	[35]			197,100,000				603,500,000	[36]	575,400,000	[37]
Appalachian Power Co [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			28,100,000				26,800,000				84,300,000		78,200,000
Appalachian Power Co [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			868,300,000				802,300,000				2,593,300,000		2,362,200,000
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			124,300,000				124,900,000				374,200,000		354,600,000
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,028,800,000				962,400,000				3,038,500,000		2,776,800,000
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			3,100,000				3,300,000				12,400,000		9,800,000
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			4,000,000.0				4,100,000				$ 12,100,000		$ 13,300,000
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate											5.79%		5.81%
Minimum Interest Rate											5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 399,500,000
Maximum Loans to Money Pool											132,300,000
Average Borrowings from Money Pool											110,200,000
Average Loans to Money Pool											32,600,000
Authorized Short Term Borrowing Limit											$ 750,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											5.72%		5.47%
Average Interest Rate For Funds Loaned											5.51%		5.47%
Appalachian Power Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 18,000,000.0								$ 18,000,000.0
Appalachian Power Co [Member] | Pollution Control Bond [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 86,000,000.0
Due Date											2028
Interest Rate (Percentage)			3.38%								3.38%
Appalachian Power Co [Member] | OtherLongTermDebtFour
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 300,000,000.0
Due Date											2024
Interest Rate (Variable)											Variable
Appalachian Power Co [Member] | Pollution Control Bond Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 86,000,000.0
Due Date											2024
Interest Rate (Percentage)			2.55%								2.55%
Appalachian Power Co [Member] | Other Long Term Debt Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 100,000
Due Date											2026
Interest Rate (Percentage)			13.72%								13.72%
Appalachian Power Co [Member] | Securitization Bonds Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 27,400,000
Due Date											2028
Interest Rate (Percentage)			3.77%								3.77%
Appalachian Power Co [Member] | Senior Unsecured Notes Four
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 400,000,000.0
Due Date											2034
Interest Rate (Percentage)			5.65%								5.65%
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,517,500,000								$ 3,517,500,000				3,499,400,000
Long-term Debt Due Within One Year			284,100,000								284,100,000				83,700,000
Long-term Debt			3,233,400,000								3,233,400,000				3,415,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											76,100,000		$ 324,100,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			183,600,000								183,600,000				156,400,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			576,700,000				553,300,000				1,608,500,000		1,575,900,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition			366,000,000								$ 366,000,000				348,000,000
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 80,400,000		494,800,000
Fixed Performance Obligations			23,200,000								23,200,000
Indiana Michigan Power Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			(77,000,000.0)								(77,000,000.0)				(63,300,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,300,000				600,000				5,200,000		3,700,000
Indiana Michigan Power Co [Member] | 2024 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			1,100,000								1,100,000
Indiana Michigan Power Co [Member] | 2025-2026[Member]
Financing Activities (Textuals)
Fixed Performance Obligations			8,800,000								8,800,000
Indiana Michigan Power Co [Member] | 2027-2028 [Member]
Financing Activities (Textuals)
Fixed Performance Obligations			8,800,000								8,800,000
Indiana Michigan Power Co [Member] | After 2028
Financing Activities (Textuals)
Fixed Performance Obligations			4,500,000								4,500,000
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			10,400,000	[23]			10,400,000	[24]			30,500,000	[25]	28,100,000	[26]
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			35,300,000	[27]			26,200,000	[28]			92,300,000	[29]	92,600,000	[30]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			18,000,000				18,000,000				59,000,000		52,000,000
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			113,500,000	[31]			90,200,000	[32]			305,600,000	[33]	257,700,000	[34]
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			249,400,000				230,700,000				664,700,000		655,500,000
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			169,900,000				159,200,000				465,500,000		439,500,000
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			155,400,000	[35]			159,100,000				456,400,000	[36]	467,600,000	[37]
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				1,300,000				3,800,000		3,800,000
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			575,900,000				550,300,000				1,590,400,000		1,566,400,000
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			123,900,000				100,600,000				336,100,000		285,800,000
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			735,100,000				677,100,000				2,018,800,000		1,944,800,000
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,100,000				4,200,000				7,000,000.0		9,700,000
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 15,200,000				15,400,000				50,700,000		45,800,000
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											$ 7,400,000
Due Date											2025
Interest Rate (Percentage)			0.93%								0.93%
Indiana Michigan Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			$ 4,100,000				4,400,000				$ 12,000,000.0		$ 12,200,000
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate											5.79%		5.81%
Minimum Interest Rate											5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 126,900,000
Maximum Loans to Money Pool											8,400,000
Average Borrowings from Money Pool											53,300,000
Average Loans to Money Pool											3,900,000
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											5.64%		5.13%
Average Interest Rate For Funds Loaned											5.44%		5.54%
Indiana Michigan Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			$ (77,000,000.0)								$ (77,000,000.0)
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											$ 2,900,000
Due Date											2025
Interest Rate (Variable)											Variable
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Six [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 15,200,000
Due Date											2026
Interest Rate (Percentage)			3.44%								3.44%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Seven [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 15,100,000
Due Date											2027
Interest Rate (Percentage)			5.93%								5.93%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Eight [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 20,600,000
Due Date											2028
Interest Rate (Percentage)			6.01%								6.01%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Nine
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 11,400,000
Due Date											2028
Interest Rate (Percentage)			6.41%								6.41%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 80,400,000
Due Date											2028
Interest Rate (Percentage)			6.41%								6.41%
Indiana Michigan Power Co [Member] | Other Long Term Debt Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 1,800,000
Due Date											2025
Interest Rate (Percentage)			6.00%								6.00%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Three [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 1,700,000
Due Date											2024
Interest Rate (Variable)											Variable
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Twelve | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		$ 9,000,000
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,715,000,000								$ 3,715,000,000				3,366,800,000
Long-term Debt			3,715,000,000								3,715,000,000				3,366,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											0		$ 600,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			517,200,000								517,200,000				541,700,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			860,000,000.0				850,300,000				2,477,200,000		2,518,600,000
Financing Activities (Textuals)
Issuance of Long-term Debt											346,300,000		395,000,000.0
Ohio Power Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			0								0				(110,500,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			5,600,000				7,800,000				17,000,000.0		23,600,000
Financing Activities (Textuals)
Net Loans To Money Pool			97,400,000								97,400,000				0
Ohio Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			24,500,000	[23]			21,400,000	[24]			71,900,000	[25]	60,300,000	[26]
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			50,800,000	[27]			49,200,000	[28]			121,500,000	[29]	127,900,000	[30]
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	[31]			0	[32]			0	[33]	0	[34]
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			543,400,000				536,300,000				1,565,200,000		1,491,600,000
Ohio Power Co [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			276,200,000				275,300,000				838,400,000		811,600,000
Ohio Power Co [Member] | Industrial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			89,900,000	[35]			103,600,000				279,400,000	[36]	394,000,000.0	[37]
Ohio Power Co [Member] | Other Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			4,200,000				3,800,000				12,900,000		11,200,000
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			913,700,000				919,000,000.0				2,695,900,000		2,708,400,000
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			24,500,000				21,400,000				71,900,000		60,300,000
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			989,000,000.0				989,600,000				2,889,300,000		2,896,600,000
Ohio Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,800,000				3,000,000.0				8,300,000		10,300,000
Ohio Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			7,500,000				7,400,000				$ 22,300,000		$ 22,300,000
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate											5.79%		5.81%
Minimum Interest Rate											5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 310,000,000.0
Maximum Loans to Money Pool											159,900,000
Average Borrowings from Money Pool											180,500,000
Average Loans to Money Pool											75,900,000
Authorized Short Term Borrowing Limit											$ 600,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											5.70%		5.37%
Average Interest Rate For Funds Loaned											5.49%		5.60%
Ohio Power Co [Member] | Utility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 97,400,000								$ 97,400,000
Ohio Power Co [Member] | Senior Unsecured Notes Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 350,000,000.0
Due Date											2034
Interest Rate (Percentage)			5.65%								5.65%
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 2,385,400,000								$ 2,385,400,000				2,384,600,000
Long-term Debt Due Within One Year			250,600,000								250,600,000				600,000
Long-term Debt			2,134,800,000								2,134,800,000				2,384,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											400,000		$ 400,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			192,200,000								192,200,000				134,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			611,500,000				633,800,000				$ 1,398,100,000		1,510,300,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 0		469,800,000
Public Service Co Of Oklahoma [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			(98,500,000)								(98,500,000)				(54,400,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			1,100,000				200,000				5,700,000		1,000,000.0
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			12,000,000.0	[23]			10,800,000	[24]			33,000,000.0	[25]	32,000,000.0	[26]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			6,000,000.0	[27]			5,400,000	[28]			30,400,000	[29]	14,900,000	[30]
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			2,100,000	[31]			(4,900,000)	[32]			7,000,000.0	[33]	300,000	[34]
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			301,100,000				310,500,000				647,100,000		667,900,000
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			165,100,000				171,900,000				398,200,000		412,700,000
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			98,500,000	[35]			114,100,000				269,900,000	[36]	320,200,000	[37]
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			30,800,000				33,800,000				78,200,000		86,300,000
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			595,500,000				630,300,000				1,393,400,000		1,487,100,000
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			14,100,000				5,900,000				40,000,000.0		32,300,000
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			615,600,000				641,600,000				1,463,800,000		1,534,300,000
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				1,400,000				17,200,000		5,100,000
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			4,100,000				4,600,000				$ 10,900,000		$ 11,300,000
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate											5.79%		5.81%
Minimum Interest Rate											5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 302,200,000
Maximum Loans to Money Pool											0
Average Borrowings from Money Pool											184,000,000.0
Average Loans to Money Pool											0
Authorized Short Term Borrowing Limit											$ 750,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											5.59%		5.48%
Average Interest Rate For Funds Loaned											0.00%		5.24%
Public Service Co Of Oklahoma [Member] | Utility [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			$ (98,500,000)								$ (98,500,000)
Public Service Co Of Oklahoma [Member] | Other Long Term Debt Seven
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%
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,648,700,000								$ 3,648,700,000				3,646,900,000
Long-term Debt			3,648,700,000								3,648,700,000				3,646,900,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											0		$ 94,100,000
Short-term Debt:
Notes Payable			4,600,000								4,600,000				4,300,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			189,200,000								189,200,000				168,300,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			531,400,000				558,400,000				$ 1,428,700,000		1,456,500,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 0		346,800,000
Southwestern Electric Power Co [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			(237,400,000)								(237,400,000)				(88,700,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			21,900,000				14,400,000				52,300,000		45,700,000
Financing Activities (Textuals)
Net Loans To Money Pool			2,800,000								2,800,000				$ 2,200,000
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			50,000,000.0	[23]			42,400,000	[24]			136,300,000	[25]	123,600,000	[26]
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			22,000,000				17,000,000				50,000,000		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			8,800,000	[27]			6,000,000.0	[28]			26,000,000.0	[29]	20,900,000	[30]
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			42,700,000	[31]			36,800,000	[32]			139,900,000	[33]	120,300,000	[34]
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			260,100,000				286,500,000				563,200,000		647,500,000
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			172,500,000				174,900,000				413,200,000		472,200,000
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			102,500,000	[35]			105,500,000				269,800,000	[36]	320,300,000	[37]
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			2,300,000				2,400,000				6,600,000		7,600,000
Southwestern Electric Power Co [Member] | Retail [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			537,400,000				569,300,000				1,252,800,000		1,447,600,000
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			92,700,000				79,200,000				276,200,000		243,900,000
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			638,900,000				654,500,000				1,555,000,000		1,712,400,000
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			700,000				500,000				7,000,000.0		1,800,000
Southwestern Electric Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			4,400,000				5,200,000				$ 13,500,000		$ 13,900,000
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate											5.79%		5.81%
Minimum Interest Rate											5.14%		4.66%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 362,200,000
Maximum Loans to Money Pool											0
Average Borrowings from Money Pool											243,200,000
Average Loans to Money Pool											0
Authorized Short Term Borrowing Limit											$ 750,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											5.58%		5.25%
Average Interest Rate For Funds Loaned											0.00%		5.72%
Southwestern Electric Power Co [Member] | Utility [Member] | Related Party
Short-term Debt:
Other Short-Term Borrowings			(237,400,000)								$ (237,400,000)
Southwestern Electric Power Co [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool											2,800,000
Average Loans to Money Pool											$ 2,600,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned											5.79%		5.81%
Minimum Interest Rate for Funds Loaned											5.25%		4.66%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned											5.64%		5.49%
Southwestern Electric Power Co [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Net Loans To Money Pool			$ 2,800,000								$ 2,800,000
Southwestern Electric Power Co [Member] | Loans Payable [Member]
Short-term Debt:
Weighted Average Interest Rate	[4]		7.20%								7.20%				7.71%
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	[2]										$ 50,000,000.0
Due Date											2025
Interest Rate (Variable)											Variable
Transource Energy [Member] | Other Long Term Debt Nine | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt		$ 2,000,000
Due Date		2025
Interest Rate (Variable)		variable
Transource Energy [Member] | Senior Unsecured Notes Seven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 1,400,000
Due Date											2050
Interest Rate (Percentage)			2.75%								2.75%
Transource Energy [Member] | Senior Unsecured Notes Eight
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 1,200,000
Due Date											2050
Interest Rate (Percentage)			2.75%								2.75%
Kentucky Power Co [Member] | Senior Unsecured Notes Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 65,000,000.0
Due Date											2024
Interest Rate (Percentage)			3.13%								3.13%
Wheeling Power Company | Notes Payable, Other Payable Eleven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 265,000,000.0
Due Date											2024
Interest Rate (Variable)											Variable
Wheeling Power Company | Notes Payable, Other Payable Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 450,000,000.0
Due Date											2034
Interest Rate (Percentage)			6.89%								6.89%
AEP Generating Company | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[2]										$ 70,000,000.0
Due Date											2025
Interest Rate (Variable)											Variable
AEP Generating Company | Notes Payable, Other Payable Ten
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 5,000,000.0
Due Date											2028
Interest Rate (Percentage)			2.43%								2.43%
AEP Generating Company | Other Long Term Debt Eight
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 80,000,000.0
Due Date											2024
Interest Rate (Variable)											Variable
AEP Southwestern Transmission Co | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 1,900,000
Maximum Loans to Money Pool											0
Average Borrowings from Money Pool											1,800,000
Average Loans to Money Pool											0
Borrowings from Parent			$ 1,800,000								1,800,000
Loans to Parent			0								0
Authorized Short Term Borrowing Limit	[39]										$ 50,000,000.0
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,			$ (2,500,000)		$ (1,100,000)	$ 14,800,000	$ (6,700,000)		$ (3,300,000)	$ 12,700,000

[1] Pursuant to the Nuclear Waste Policy Act of 1982, I&M, a nuclear licensee, has an obligation to the United States Department of Energy for SNF disposal. The obligation includes a one-time fee for nuclear fuel consumed prior to April 7, 1983. Trust fund assets related to this obligation were $366 million and $348 million as of September 30, 2024 and December 31, 2023, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on the balance sheets.

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

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

[4] Weighted-average rate as of September 30, 2024 and December 31, 2023, respectively.

[5] Represents inter-segment revenues.

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

[7] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $402 million. The affiliated revenue for Vertically Integrated Utilities was $51 million. The remaining affiliated amounts were immaterial.

[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $366 million. The remaining affiliated amounts were immaterial.

[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.2 billion. The affiliated revenue for Vertically Integrated Utilities was $133 million. The remaining affiliated amounts were immaterial.

[10] 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.

[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $34 million. The remaining affiliated amounts were immaterial.

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

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $112 million. The remaining affiliated amounts were immaterial.

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $87 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 $14 million. The remaining affiliated amounts were immaterial.

[20] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $37 million. The remaining affiliated amounts were immaterial.

[21] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $84 million. The remaining affiliated amounts were immaterial.

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

[23] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $399 million, APCo was $22 million and SWEPCo was $22 million. The remaining affiliated amounts were immaterial.

[24] 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.

[25] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.2 billion, APCo was $65 million and SWEPCo was $50 million. The remaining affiliated amounts were immaterial.

[26] 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.

[27] 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.

[28] 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.

[29] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $59 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[30] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $52 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

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

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

[33] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $118 million primarily related to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

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

[35] Amounts include affiliated and nonaffiliated revenues.

[36] Amounts include affiliated and nonaffiliated revenues.

[37] Amounts include affiliated and nonaffiliated revenues.

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

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