Revenue from Contracts with Customers (Details) - USD ($)		3 Months Ended
		Mar. 31, 2023		Mar. 31, 2022		Dec. 31, 2022
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 4,690,900,000		$ 4,592,600,000
Revenues		4,690,900,000		4,592,600,000
Revenue, Performance Obligation
Fixed Performance Obligations		422,000,000.0
Revenue Textuals
Revenue from Related Parties		0		0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,788,400,000		3,368,900,000
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,827,200,000		1,751,400,000
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,009,300,000		862,600,000
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		883,000,000.0		695,900,000
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		68,900,000		59,000,000.0
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		977,100,000		945,000,000.0
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		215,200,000		227,500,000
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		327,200,000	[1]	312,900,000	[2]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21,200,000	[3]	21,600,000	[4]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		413,500,000	[3]	383,000,000.0	[5]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		65,300,000	[6]	119,100,000	[4]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4,830,800,000		4,433,000,000
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(139,900,000)		159,600,000
Alternative [Member]
Disaggregation of Revenue
Revenues		(10,000,000.0)	[7]	(5,800,000)	[8]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		92,400,000		94,100,000
Revenues		(129,900,000)	[3]	165,400,000	[4],[9]
2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		63,400,000
2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		160,500,000
2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		137,100,000
After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		61,000,000.0
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		429,500,000		416,700,000
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		13,500,000				$ 11,900,000
Revenue Textuals
Revenue from Related Parties		1,200,000		900,000
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		275,600,000		275,600,000
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		130,700,000		141,900,000
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		97,300,000		94,900,000
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		39,300,000		30,600,000
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8,300,000		8,200,000
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		146,300,000		133,100,000
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[10]	0	[11]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		146,300,000	[12]	133,100,000	[13]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9,700,000	[14]	9,300,000	[15]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		431,600,000		418,000,000.0
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2,100,000)		(1,300,000)
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2,100,000)	[16]	(1,300,000)	[17]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		600,000		1,100,000
Revenues		0	[18]	0	[19]
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		0				100,000
AEP Transmission Co [Member]
Disaggregation of Revenue
Revenues		441,600,000		400,400,000
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		127,000,000.0				119,500,000
Revenue Textuals
Revenue from Related Parties		357,400,000		325,000,000.0
AEP Transmission Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		438,700,000		400,300,000
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[10]	0	[11]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		438,700,000	[12]	400,300,000	[13]
Revenue Textuals
Revenue from Related Parties		349,000,000		323,000,000
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,700,000	[14]	(300,000)	[15]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		442,400,000		400,000,000.0
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(800,000)		400,000
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(800,000)	[16]	400,000	[17]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0	[18]	0	[19]
AEP Transmission Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		122,500,000				113,800,000
Appalachian Power Co [Member]
Disaggregation of Revenue
Revenues		987,700,000		907,300,000
Revenue, Performance Obligation
Fixed Performance Obligations		80,300,000
Affiliated Companies - Contracts with Customers		91,500,000				94,000,000.0
Revenue Textuals
Revenue from Related Parties		69,600,000		56,900,000
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		853,800,000		786,300,000
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		470,500,000		458,000,000.0
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		171,300,000		153,900,000
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		185,800,000		153,800,000
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		26,200,000		20,600,000
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		121,600,000		97,300,000
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		80,200,000	[10]	56,200,000	[11]
Revenue Textuals
Revenue from Related Parties		47,000,000		36,000,000
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		41,400,000	[12]	41,100,000	[13]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		13,000,000.0	[14]	24,300,000	[15]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		988,400,000		907,900,000
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(700,000)		(600,000)
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(700,000)	[16]	(700,000)	[17]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,600,000		3,300,000
Revenues		0	[18]	100,000	[19]
Appalachian Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		65,100,000				64,500,000
Appalachian Power Co [Member] | 2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		12,100,000
Appalachian Power Co [Member] | 2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		32,200,000
Appalachian Power Co [Member] | 2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		24,300,000
Appalachian Power Co [Member] | After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		11,700,000
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenues		663,000,000.0		625,200,000
Revenue, Performance Obligation
Fixed Performance Obligations		26,400,000
Affiliated Companies - Contracts with Customers		86,600,000				104,000,000.0
Revenue Textuals
Revenue from Related Parties		1,200,000		2,000,000.0
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		532,400,000		496,200,000
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		239,600,000		231,800,000
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		138,900,000		126,600,000
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		152,600,000		136,500,000
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,300,000		1,300,000
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		112,100,000		99,200,000
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		104,000,000.0	[10]	90,400,000	[11]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8,100,000	[12]	8,800,000	[13]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21,400,000	[14]	29,900,000	[15]
Revenue Textuals
Revenue from Related Parties		18,000,000
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		665,900,000		625,300,000
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2,900,000)		(100,000)
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2,900,000)	[16]	0	[17]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,100,000		2,800,000
Revenues		0	[18]	(100,000)	[19]
Revenue Textuals
Revenue from Related Parties				10,000,000
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		56,400,000				75,300,000
Indiana Michigan Power Co [Member] | 2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		3,400,000
Indiana Michigan Power Co [Member] | 2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		9,200,000
Indiana Michigan Power Co [Member] | 2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		9,200,000
Indiana Michigan Power Co [Member] | After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		4,600,000
Ohio Power Co [Member]
Disaggregation of Revenue
Revenues		1,034,600,000		830,000,000.0
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		113,900,000				100,900,000
Revenue Textuals
Revenue from Related Parties		7,600,000		3,700,000
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		981,900,000		759,400,000
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		526,000,000.0		458,700,000
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		278,500,000		194,700,000
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		173,600,000		102,700,000
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,800,000		3,300,000
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		17,900,000		21,800,000
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[10]	0	[11]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		17,900,000	[12]	21,800,000	[13]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		33,200,000	[14]	44,600,000	[15]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,033,000,000		825,800,000
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		1,600,000		4,200,000
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(9,500,000)	[16]	(2,100,000)	[17]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5,200,000		2,100,000
Revenues		11,100,000	[18]	6,300,000	[19]
Ohio Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		57,500,000				49,900,000
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenues		417,000,000.0		387,600,000
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		33,500,000				52,200,000
Revenue Textuals
Revenue from Related Parties		700,000		600,000
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		402,500,000		363,200,000
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		170,900,000		165,900,000
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		109,100,000		97,500,000
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		98,300,000		78,600,000
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		24,200,000		21,200,000
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		12,200,000		19,100,000
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		900,000	[10]	9,500,000	[11]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		11,300,000	[12]	9,600,000	[13]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,300,000	[14]	5,400,000	[15]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		417,000,000.0		387,700,000
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0		(100,000)
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0	[16]	(100,000)	[17]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,500,000		600,000
Revenues		0	[18]	0	[19]
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		12,700,000				18,800,000
Southwestern Electric Power Co [Member]
Disaggregation of Revenue
Revenues		515,900,000		494,800,000
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		38,900,000				65,400,000
Revenue Textuals
Revenue from Related Parties		11,700,000		10,000,000.0
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		426,200,000		393,500,000
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		175,900,000		175,900,000
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		143,500,000		130,500,000
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		104,200,000		84,700,000
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,600,000		2,400,000
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		82,500,000		96,400,000
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		39,600,000	[10]	61,200,000	[11]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		42,900,000	[12]	35,200,000	[13]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		7,900,000	[14]	5,300,000	[15]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		516,600,000		495,200,000
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(700,000)		(400,000)
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(700,000)	[16]	(400,000)	[17]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		500,000		600,000
Revenues		0	[18]	0	[19]
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		19,600,000				$ 19,100,000
Consolidation Eliminations [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Revenues		(443,700,000)		(392,200,000)
Revenue Textuals
Revenue from Related Parties		(443,700,000)		(392,200,000)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(200,000)		(400,000)
Consolidation Eliminations [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Consolidation Eliminations [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Consolidation Eliminations [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(200,000)		(400,000)
Consolidation Eliminations [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Consolidation Eliminations [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(401,800,000)		(371,600,000)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(401,800,000)	[1]	(361,800,000)	[2]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(100,000)	[3]	(800,000)	[4]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		100,000	[3]	(9,000,000.0)	[5]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(43,700,000)	[6]	(18,600,000)	[4]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(445,700,000)		(390,600,000)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2,000,000.0		(1,600,000)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		2,900,000	[7]	1,300,000	[8]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(900,000)	[3]	(2,900,000)	[4],[9]
Consolidation Eliminations [Member] | AEP Transmission Co [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Revenues		0		0
Revenue Textuals
Revenue from Related Parties		0		0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		2,857,800,000		2,687,400,000
Revenue Textuals
Revenue from Related Parties		41,500,000		40,600,000
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,530,900,000		2,334,100,000
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,170,400,000		1,150,800,000
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		633,400,000		572,900,000
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		670,300,000		563,000,000.0
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		56,800,000		47,400,000
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		297,500,000		292,500,000
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		182,800,000		187,200,000
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		114,700,000	[1]	105,300,000	[2]
Vertically Integrated Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[3]	0	[4]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[3]	0	[5]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		32,600,000	[6]	61,600,000	[4]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,861,000,000		2,688,200,000
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(3,200,000)		(800,000)
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(3,100,000)	[7]	(800,000)	[8]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(100,000)	[3]	0	[4],[9]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,464,200,000		1,246,800,000
Revenue Textuals
Revenue from Related Parties		8,900,000		4,600,000
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,257,700,000		1,035,200,000
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		656,800,000		600,600,000
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		375,900,000		289,700,000
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		212,900,000		133,300,000
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		12,100,000		11,600,000
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		164,200,000		154,900,000
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		164,200,000	[1]	154,900,000	[2]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[3]	0	[4]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[3]	0	[5]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		42,800,000	[6]	53,800,000	[4]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,464,700,000		1,243,900,000
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(500,000)		2,900,000
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(11,600,000)	[7]	(3,400,000)	[8]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		11,100,000	[3]	6,300,000	[4],[9]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		455,500,000		411,400,000
AEP Transmission Holdco [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Holdco [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Holdco [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Holdco [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Holdco [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Holdco [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		450,100,000		414,500,000
AEP Transmission Holdco [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
AEP Transmission Holdco [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		450,100,000	[1]	414,500,000	[2]
Revenue Textuals
Revenue from Related Parties		357,000,000		327,000,000
AEP Transmission Holdco [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[3]	0	[4]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[3]	0	[5]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,600,000	[6]	(200,000)	[4]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		453,700,000		414,300,000
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		1,800,000		(2,900,000)
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		1,800,000	[7]	(2,900,000)	[8]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0	[3]	0	[4],[9]
Generation And Marketing [Member]
Disaggregation of Revenue
Revenues		327,000,000.0		619,300,000
Revenue Textuals
Revenue from Related Parties		100,000		9,800,000
Generation And Marketing [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Generation And Marketing [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Generation And Marketing [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Generation And Marketing [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Generation And Marketing [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Generation And Marketing [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		467,400,000		451,500,000
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		32,400,000		40,300,000
Generation And Marketing [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[1]	0	[2]
Generation And Marketing [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21,300,000	[3]	22,400,000	[4]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		413,700,000	[3]	388,800,000	[5]
Revenue Textuals
Revenue from Related Parties				9,000,000
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		600,000	[6]	8,600,000	[4]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		468,000,000.0		460,100,000
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(141,000,000.0)		159,200,000
Generation And Marketing [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0	[7]	0	[8]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(141,000,000.0)	[3],[20]	159,200,000	[4],[9]
Other Segments [Member]
Disaggregation of Revenue
Revenues	[21]	30,100,000		19,900,000
Revenue Textuals
Revenue from Related Parties	[21]	27,800,000		9,200,000
Other Segments [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Other Segments [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Other Segments [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Other Segments [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Other Segments [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Other Segments [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(300,000)		3,200,000
Other Segments [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0
Other Segments [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[1]	0	[2]
Other Segments [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[3]	0	[4]
Other Segments [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(300,000)	[3]	3,200,000	[5]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		29,400,000	[6]	13,900,000	[4]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		29,100,000		17,100,000
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		1,000,000.0		2,800,000
Other Segments [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0	[7]	0	[8]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers	[21]	2,300,000		10,700,000
Revenues		1,000,000.0	[3]	$ 2,800,000	[4],[9]
Corporate and Other | Other Revenues [Member]
Revenue Textuals
Revenue from Related Parties		$ 29,000,000

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

[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $327 million. The remaining affiliated amounts were immaterial.

[3] Amounts include affiliated and nonaffiliated revenues.

[4] Amounts include affiliated and nonaffiliated revenues

[5] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $9 million. The remaining affiliated amounts were immaterial.

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

[7] Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.

[8] Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.

[9] Generation & Marketing includes economic hedge activity.

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

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

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

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $323 million. The remaining affiliated amounts were immaterial.

[14] 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.

[15] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $10 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[16] Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.

[17] Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.

[18] Amounts include affiliated and nonaffiliated revenues.

[19] Amounts include affiliated and nonaffiliated revenues.

[20] Generation & Marketing includes economic hedge activity.

[21] 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.