Revenue from Contracts with Customers (Details) - USD ($)		3 Months Ended				9 Months Ended
		Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021		Dec. 31, 2021
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 5,526,100,000		$ 4,623,000,000		$ 14,758,400,000		$ 12,730,600,000
Revenues		5,526,100,000		4,623,000,000		14,758,400,000		12,730,600,000
Revenue, Performance Obligation
Fixed Performance Obligations		745,500,000				745,500,000
Revenue Textuals
Revenue from Related Parties		0		0		0		0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4,037,000,000		3,360,800,000		10,773,300,000		9,147,600,000
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,019,900,000		1,742,300,000		5,312,200,000		4,657,400,000
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,098,100,000		898,800,000		2,917,200,000		2,446,100,000
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		849,700,000		661,100,000		2,349,900,000		1,885,800,000
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		69,300,000		58,600,000		194,000,000.0		158,300,000
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,224,700,000		1,008,000,000		3,247,000,000		3,097,800,000
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		382,800,000		281,600,000		881,700,000	[1]	876,500,000
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		314,800,000	[2]	308,800,000	[3]	991,000,000.0	[4]	878,600,000	[5]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		41,800,000	[6]	23,500,000	[7]	98,700,000	[1]	65,000,000.0	[8]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		485,300,000		394,100,000	[9]	1,275,600,000	[10]	1,277,700,000	[11]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		138,000,000.0	[12]	93,500,000	[7]	373,800,000	[13]	261,000,000.0	[8]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5,399,700,000		4,462,300,000		14,394,100,000		12,506,400,000
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		126,400,000		160,700,000		364,300,000		224,200,000
Alternative [Member]
Disaggregation of Revenue
Revenues		(1,900,000)	[6]	5,900,000	[7]	(65,100,000)	[1]	35,500,000	[8]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		92,900,000		93,800,000		280,500,000		276,200,000
Revenues		128,300,000	[6]	154,800,000	[7],[14]	429,400,000	[1],[15]	188,700,000	[8],[16]
2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		318,700,000				318,700,000
2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		172,100,000				172,100,000
2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		157,800,000				157,800,000
After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		96,900,000				96,900,000
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		508,900,000		432,600,000		1,404,400,000		1,195,300,000
Revenue, Performance Obligation
Fixed Performance Obligations		145,800,000				145,800,000
Affiliated Companies - Contracts with Customers		5,900,000				5,900,000				$ 7,900,000
Revenue Textuals
Revenue from Related Parties		900,000		900,000		2,600,000		2,900,000
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		358,000,000.0		295,200,000		965,200,000		793,600,000
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		204,000,000.0		172,500,000		520,800,000		423,700,000
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		107,100,000		89,100,000		312,600,000		265,200,000
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		35,400,000		25,400,000		102,600,000	[17]	81,600,000
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		11,500,000		8,200,000		29,200,000		23,100,000
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		140,800,000		131,500,000		417,700,000		364,500,000
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[18]	0	[19]	0	[20]	0	[21]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		140,800,000	[22]	131,500,000	[23]	417,700,000	[24]	364,500,000	[25]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9,500,000	[26]	6,800,000	[27]	24,400,000	[28]	35,400,000	[29]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		508,300,000		433,500,000		1,407,300,000		1,193,500,000
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		600,000		(900,000)		(2,900,000)		1,800,000
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		600,000	[30]	(900,000)	[31]	(2,900,000)	[17]	1,800,000	[32]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		300,000		900,000		2,500,000		3,300,000
Revenues		0	[30]	0	[31]	0	[17]	0	[32]
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		0				0				400,000
AEP Texas Inc. [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		145,800,000				145,800,000
AEP Texas Inc. [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
AEP Texas Inc. [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
AEP Texas Inc. [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
AEP Transmission Co [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers								300,000
Revenues		418,500,000		377,000,000.0		1,183,300,000		1,104,200,000
Revenue, Performance Obligation
Fixed Performance Obligations		369,400,000				369,400,000
Affiliated Companies - Contracts with Customers		111,000,000.0				111,000,000.0				96,100,000
Revenue Textuals
Revenue from Related Parties		340,600,000		297,700,000		999,500,000		882,300,000
AEP Transmission Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0	[17]	0
AEP Transmission Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		411,700,000		360,100,000		1,218,100,000		1,045,200,000
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[18]	0	[19]	0	[20]	0	[21]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		411,700,000	[22]	360,100,000	[23]	1,218,100,000	[24]	1,045,200,000	[25]
Revenue Textuals
Revenue from Related Parties		339,000,000		281,000,000		992,000,000		823,000,000
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(300,000)	[26]	5,000,000.0	[27]	(400,000)	[28]	12,500,000	[29]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		411,400,000		365,100,000		1,217,700,000		1,057,700,000
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		7,100,000		11,900,000		(34,400,000)		46,500,000
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		7,100,000	[30]	11,900,000	[31]	(34,400,000)	[17]	46,500,000	[32]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		200,000		0		300,000
Revenues		0	[30]	0	[31]	0	[17]	0	[32]
AEP Transmission Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		110,600,000				110,600,000				95,500,000
AEP Transmission Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		369,400,000				369,400,000
AEP Transmission Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
AEP Transmission Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
AEP Transmission Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Appalachian Power Co [Member]
Disaggregation of Revenue
Revenues		888,900,000		804,000,000.0		2,569,800,000		2,298,000,000
Revenue, Performance Obligation
Fixed Performance Obligations		121,900,000				121,900,000
Affiliated Companies - Contracts with Customers		92,600,000				92,600,000				129,900,000
Revenue Textuals
Revenue from Related Parties		67,600,000		52,400,000		187,600,000		140,600,000
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		705,500,000		660,400,000		2,139,700,000		1,919,600,000
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		360,500,000		340,100,000		1,131,700,000		1,025,000,000
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		161,100,000		146,900,000		467,600,000		409,500,000
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		163,300,000		154,800,000		479,000,000.0	[17]	433,400,000
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		20,600,000		18,600,000		61,400,000		51,700,000
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		149,400,000		118,900,000		351,000,000.0		325,300,000
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		107,900,000	[18]	83,700,000	[19]	227,600,000	[20]	231,200,000	[21]
Revenue Textuals
Revenue from Related Parties		44,000,000		30,000,000		122,000,000		90,000,000
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		41,500,000	[22]	35,200,000	[23]	123,400,000	[24]	94,100,000	[25]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		33,700,000	[26]	22,500,000	[27]	78,600,000	[28]	43,600,000	[29]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		888,600,000		801,800,000		2,569,300,000		2,288,500,000
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		300,000		2,200,000		500,000		9,500,000
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0	[30]	2,200,000	[31]	100,000	[17]	9,500,000	[32]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,900,000		3,100,000		11,800,000		8,200,000
Revenues		300,000	[30]	0	[31]	400,000	[17]	0	[32]
Appalachian Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		65,800,000				65,800,000				117,800,000
Appalachian Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		50,100,000				50,100,000
Appalachian Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		33,700,000				33,700,000
Appalachian Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		26,600,000				26,600,000
Appalachian Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		11,500,000				11,500,000
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenues		715,400,000		635,700,000		1,971,600,000		1,784,000,000
Revenue, Performance Obligation
Fixed Performance Obligations		37,000,000.0				37,000,000.0
Affiliated Companies - Contracts with Customers		72,700,000				72,700,000				78,200,000
Revenue Textuals
Revenue from Related Parties		2,000,000.0		1,100,000		11,100,000		2,600,000
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		549,700,000		523,700,000		1,540,900,000		1,431,700,000
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		238,600,000		231,700,000		665,600,000		624,400,000
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		154,300,000		143,900,000		419,500,000		384,500,000
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		155,600,000		146,800,000		452,100,000	[17]	418,900,000
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,200,000		1,300,000		3,700,000		3,900,000
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		135,100,000		88,900,000		337,200,000		273,400,000
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		126,300,000	[18]	80,200,000	[19]	310,900,000	[20]	248,100,000	[21]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8,800,000	[22]	8,700,000	[23]	26,300,000	[24]	25,300,000	[25]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		30,600,000	[26]	24,200,000	[27]	86,300,000	[28]	81,900,000	[29]
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		715,400,000		636,800,000		1,964,400,000		1,787,000,000
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0		(1,100,000)		7,200,000		(3,000,000.0)
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0	[30]	(1,100,000)	[31]	7,300,000	[17]	(3,000,000.0)	[32]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4,400,000		1,700,000		10,000,000.0		5,100,000
Revenues		0	[30]	0	[31]	(100,000)	[17]	0	[32]
Revenue Textuals
Revenue from Related Parties		15,000,000		17,000,000		44,000,000		46,000,000
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		51,100,000				51,100,000				61,200,000
Indiana Michigan Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		9,700,000				9,700,000
Indiana Michigan Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		13,600,000				13,600,000
Indiana Michigan Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		9,200,000				9,200,000
Indiana Michigan Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		4,500,000				4,500,000
Ohio Power Co [Member]
Disaggregation of Revenue
Revenues		1,021,300,000		767,700,000		2,674,200,000		2,196,500,000
Revenue, Performance Obligation
Fixed Performance Obligations		22,600,000				22,600,000
Affiliated Companies - Contracts with Customers		105,900,000				105,900,000				71,800,000
Revenue Textuals
Revenue from Related Parties		4,000,000.0		4,300,000		11,600,000		21,900,000
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		943,600,000		689,100,000		2,440,200,000		1,968,000,000
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		517,900,000		425,400,000		1,363,300,000		1,217,500,000
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		266,100,000		190,800,000		681,900,000		538,900,000
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		156,100,000		69,800,000		384,800,000	[17]	202,200,000
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,500,000		3,100,000		10,200,000		9,400,000
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21,500,000		19,100,000		64,400,000		56,200,000
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[18]	0	[19]	0	[20]	0	[21]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21,500,000	[22]	19,100,000	[23]	64,400,000	[24]	56,200,000	[25]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		64,800,000	[26]	47,300,000	[27]	169,600,000	[28]	113,800,000	[29]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,029,900,000		755,500,000		2,674,200,000		2,138,000,000
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(8,600,000)		12,200,000		0		58,500,000
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(14,100,000)	[30]	7,300,000	[31]	(18,600,000)	[17]	44,300,000	[32]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,100,000		2,400,000		6,000,000.0		6,800,000
Revenues		5,500,000	[30]	4,900,000	[31]	18,600,000	[17]	14,200,000	[32]
Ohio Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		61,500,000				61,500,000				51,700,000
Ohio Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		19,200,000				19,200,000
Ohio Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		3,400,000				3,400,000
Ohio Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Ohio Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenues		608,200,000		483,800,000		1,438,700,000		1,124,400,000
Revenue, Performance Obligation
Fixed Performance Obligations		3,400,000				3,400,000
Affiliated Companies - Contracts with Customers		93,500,000				93,500,000				35,000,000.0
Revenue Textuals
Revenue from Related Parties		700,000		1,000,000.0		2,100,000		3,100,000
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		582,000,000.0		458,200,000		1,369,900,000		1,063,500,000
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		299,600,000		236,800,000		650,700,000		516,400,000
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		153,400,000		120,900,000		372,100,000		286,800,000
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		98,900,000		77,100,000		270,000,000.0	[17]	202,100,000
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		30,100,000		23,400,000		77,100,000		58,200,000
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		19,600,000		17,800,000		48,100,000		35,600,000
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9,400,000	[18]	7,200,000	[19]	19,200,000	[20]	6,800,000	[21]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		10,200,000	[22]	10,600,000	[23]	28,900,000	[24]	28,800,000	[25]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6,400,000	[26]	8,300,000	[27]	21,400,000	[28]	24,800,000	[29]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		608,000,000.0		484,300,000		1,439,400,000		1,123,900,000
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		200,000		(500,000)		(700,000)		500,000
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		200,000	[30]	(500,000)	[31]	(700,000)	[17]	500,000	[32]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,000,000.0		1,500,000		3,700,000		3,900,000
Revenues		0	[30]	0	[31]	0	[17]	0	[32]
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		36,800,000				36,800,000				18,800,000
Public Service Co Of Oklahoma [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		3,400,000				3,400,000
Public Service Co Of Oklahoma [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Public Service Co Of Oklahoma [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Public Service Co Of Oklahoma [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Southwestern Electric Power Co [Member]
Disaggregation of Revenue
Revenues		717,500,000		584,100,000		1,748,900,000		1,630,300,000
Revenue, Performance Obligation
Fixed Performance Obligations		10,900,000				10,900,000
Affiliated Companies - Contracts with Customers		53,800,000				53,800,000				38,300,000
Revenue Textuals
Revenue from Related Parties		18,200,000		13,500,000		43,700,000		32,200,000
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		576,700,000		464,000,000.0		1,406,300,000		1,186,800,000
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		285,500,000		230,900,000		650,000,000.0		547,100,000
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		182,300,000		145,400,000		458,800,000		385,400,000
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		108,300,000		85,400,000		290,100,000	[17]	247,100,000
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		600,000		2,300,000		7,400,000		7,200,000
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		129,900,000		114,200,000		323,000,000.0		420,700,000
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		87,600,000	[18]	77,100,000	[19]	206,200,000	[20]	326,200,000	[21]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		42,300,000	[22]	37,100,000	[23]	116,800,000	[24]	94,500,000	[25]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		7,600,000	[26]	6,100,000	[27]	18,900,000	[28]	17,700,000	[29]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		714,200,000		584,300,000		1,748,200,000		1,625,200,000
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		3,300,000		(200,000)		700,000		5,100,000
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		3,300,000	[30]	(200,000)	[31]	700,000	[17]	5,100,000	[32]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		500,000		500,000		1,500,000		1,500,000
Revenues		0	[30]	0	[31]	0	[17]	0	[32]
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		20,200,000				20,200,000				$ 24,700,000
Southwestern Electric Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		10,900,000				10,900,000
Southwestern Electric Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Southwestern Electric Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Southwestern Electric Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0				0
Consolidation Eliminations [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Revenues		(425,000,000.0)		(376,000,000.0)		(1,190,500,000)		(1,112,200,000)
Revenue Textuals
Revenue from Related Parties		(425,000,000.0)		(376,000,000.0)		(1,190,500,000)		(1,112,200,000)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(300,000)		(100,000)		(700,000)		(500,000)
Consolidation Eliminations [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Consolidation Eliminations [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Consolidation Eliminations [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(300,000)		(100,000)		(700,000)		(500,000)
Consolidation Eliminations [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Consolidation Eliminations [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(395,200,000)		(321,100,000)		(1,103,900,000)		(951,700,000)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(200,000)		0		(100,000)	[1]	0
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(392,700,000)	[2]	(317,400,000)	[3]	(1,086,500,000)	[4]	(901,500,000)	[5]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(2,500,000)	[6]	(600,000)	[7]	(6,200,000)	[1]	(1,700,000)	[8]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		200,000		(3,100,000)	[9]	(11,100,000)	[10]	(48,500,000)	[11]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(31,900,000)	[12]	(40,100,000)	[7]	(71,600,000)	[13]	(87,900,000)	[8]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(427,400,000)		(361,300,000)		(1,176,200,000)		(1,040,100,000)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2,400,000		(14,700,000)		(14,300,000)		(72,100,000)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		4,400,000	[6]	(11,700,000)	[7]	(7,400,000)	[1]	(63,500,000)	[8]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(2,000,000.0)	[6]	(3,000,000.0)	[7],[14]	(6,900,000)	[1],[15]	(8,600,000)	[8],[16]
Consolidation Eliminations [Member] | AEP Transmission Co [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Revenues		0		0		0		0
Revenue Textuals
Revenue from Related Parties		0		0		0		0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		3,226,300,000		2,759,300,000		8,562,200,000		7,557,200,000
Revenue Textuals
Revenue from Related Parties		51,700,000		42,500,000		145,800,000		111,300,000
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,735,900,000		2,376,700,000		7,368,800,000		6,386,600,000
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,298,000,000		1,144,300,000		3,428,100,000		3,016,200,000
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		725,100,000		618,900,000		1,922,800,000		1,642,000,000
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		658,500,000		566,000,000.0		1,863,300,000		1,602,500,000
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		54,300,000		47,500,000		154,600,000		125,900,000
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		419,600,000		333,600,000		1,009,200,000		1,024,400,000
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		299,300,000		233,800,000		674,800,000	[1]	757,100,000
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		120,300,000	[2]	99,800,000	[3]	334,400,000	[4]	267,300,000	[5]
Revenue Textuals
Revenue from Related Parties						120,000,000
Vertically Integrated Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[6]	0	[7]	0	[1]	0	[8]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0	[9]	0	[10]	0	[11]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		69,700,000	[12]	49,400,000	[7]	180,500,000	[13]	136,100,000	[8]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,225,200,000		2,759,700,000		8,558,500,000		7,547,100,000
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		1,100,000		(400,000)		3,700,000		10,100,000
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		900,000	[6]	500,000	[7]	3,400,000	[1]	10,700,000	[8]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		200,000	[6]	(900,000)	[7],[14]	300,000	[1],[15]	(600,000)	[8],[16]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,530,200,000		1,200,300,000		4,078,600,000		3,391,800,000
Revenue Textuals
Revenue from Related Parties		4,700,000		5,300,000		14,100,000		24,900,000
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,301,400,000		984,200,000		3,405,200,000		2,761,500,000
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		721,900,000		598,000,000.0		1,884,100,000		1,641,200,000
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		373,000,000.0		279,900,000		994,400,000		804,100,000
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		191,500,000		95,200,000		487,300,000		283,800,000
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		15,000,000.0		11,100,000		39,400,000		32,400,000
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		162,300,000		150,600,000		482,100,000		420,700,000
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0	[1]	0
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		162,300,000	[2]	150,600,000	[3]	482,100,000	[4]	420,700,000	[5]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[6]	0	[7]	0	[1]	0	[8]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0	[9]	0	[10]	0	[11]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		74,500,000	[12]	54,200,000	[7]	194,200,000	[13]	149,300,000	[8]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,538,200,000		1,189,000,000		4,081,500,000		3,331,500,000
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(8,000,000.0)		11,300,000		(2,900,000)		60,300,000
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(13,500,000)	[6]	6,400,000	[7]	(21,500,000)	[1]	46,100,000	[8]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		5,500,000	[6]	4,900,000	[7],[14]	18,600,000	[1],[15]	14,200,000	[8],[16]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		430,900,000		391,600,000		1,221,100,000		1,146,800,000
AEP Transmission Holdco [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Holdco [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Holdco [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Holdco [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Holdco [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
AEP Transmission Holdco [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		424,900,000		375,800,000		1,261,000,000		1,092,100,000
AEP Transmission Holdco [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0	[1]	0
AEP Transmission Holdco [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		424,900,000	[2]	375,800,000	[3]	1,261,000,000	[4]	1,092,100,000	[5]
Revenue Textuals
Revenue from Related Parties		342,000,000		286,000,000		1,000,000,000		835,000,000
AEP Transmission Holdco [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[6]	0	[7]	0	[1]	0	[8]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0	[9]	0	[10]	0	[11]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(300,000)	[12]	5,100,000	[7]	(300,000)	[13]	12,500,000	[8]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		424,600,000		380,900,000		1,260,700,000		1,104,600,000
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		6,300,000		10,700,000		(39,600,000)		42,200,000
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		6,300,000	[6]	10,700,000	[7]	(39,600,000)	[1]	42,200,000	[8]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0	[6]	0	[7],[14]	0	[1],[15]	0	[8],[16]
Generation And Marketing [Member]
Disaggregation of Revenue
Revenues		735,400,000		621,100,000		2,014,300,000		1,691,900,000
Revenue Textuals
Revenue from Related Parties		2,300,000		3,700,000		17,300,000		50,300,000
Generation And Marketing [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Generation And Marketing [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Generation And Marketing [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Generation And Marketing [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Generation And Marketing [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Generation And Marketing [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		610,900,000		469,000,000.0		1,591,900,000		1,511,700,000
Revenue Textuals
Revenue from Related Parties						11,000,000		49,000,000
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		83,700,000		47,800,000		207,000,000.0	[1]	119,400,000
Revenue Textuals
Revenue from Related Parties				4,000,000
Generation And Marketing [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[2]	0	[3]	0	[4]	0	[5]
Generation And Marketing [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		44,300,000	[6]	24,100,000	[7]	104,900,000	[1]	66,700,000	[8]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		482,900,000		397,100,000	[9]	1,280,000,000	[10]	1,325,600,000	[11]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,700,000	[12]	1,400,000	[7]	11,900,000	[13]	4,900,000	[8]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		612,600,000		470,400,000		1,603,800,000		1,516,600,000
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		122,800,000		150,700,000		410,500,000		175,300,000
Generation And Marketing [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0	[6]	0	[7]	0	[1]	0	[8]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		122,800,000	[6],[33]	150,700,000	[7],[14]	410,500,000	[1],[15]	175,300,000	[8],[16]
Other Segments [Member]
Disaggregation of Revenue
Revenues	[34]	28,300,000		26,700,000		72,700,000		55,100,000
Revenue Textuals
Revenue from Related Parties	[34]	17,300,000		23,200,000		36,600,000		43,500,000
Other Segments [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Other Segments [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Other Segments [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Other Segments [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Other Segments [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0		0
Other Segments [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,200,000		100,000		6,700,000		600,000
Other Segments [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0		0		0	[1]	0
Other Segments [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[2]	0	[3]	0	[4]	0	[5]
Other Segments [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0	[6]	0	[7]	0	[1]	0	[8]
Other Segments [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,200,000		100,000	[9]	6,700,000	[10]	600,000	[11]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		24,300,000	[12]	23,500,000	[7]	59,100,000	[13]	46,100,000	[8]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		26,500,000		23,600,000		65,800,000		46,700,000
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		1,800,000		3,100,000		6,900,000		8,400,000
Other Segments [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0	[6]	0	[7]	0	[1]	0	[8]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers	[34]	11,000,000.0		3,500,000		36,100,000		11,600,000
Revenues		1,800,000	[6]	$ 3,100,000	[7],[14]	6,900,000	[1],[15]	$ 8,400,000	[8],[16]
Corporate and Other | Other Revenues [Member]
Revenue Textuals
Revenue from Related Parties		$ 18,000,000
Corporate and Other | Other Revenues [Member]
Revenue Textuals
Revenue from Related Parties						$ 36,000,000

[1] Amounts include affiliated and nonaffiliated revenues.

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

[3] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $286 million. The remaining affiliated amounts were immaterial.

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

[5] (a)Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $835 million. The remaining affiliated amounts were immaterial.

[6] Amounts include affiliated and nonaffiliated revenues.

[7] Amounts include affiliated and nonaffiliated revenues

[8] Amounts include affiliated and nonaffiliated revenues.

[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $4 million. The remaining affiliated amounts were immaterial.

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

[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $49 million. The remaining affiliated amounts were immaterial.

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

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

[14] Generation & Marketing includes economic hedge activity.

[15] Generation & Marketing includes economic hedge activity.

[16] Generation & Marketing includes economic hedge activity.

[17] Amounts include affiliated and nonaffiliated revenues.

[18] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $44 million primarily related to the PPA with KGPCo.

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

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

[21] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $90 million primarily relating to the PPA with KGPCo.

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

[23] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $281 million. The remaining affiliated amounts were immaterial.

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

[25] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $823 million. The remaining affiliated amounts were immaterial.

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

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

[28] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $44 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[29] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $46 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[30] Amounts include affiliated and nonaffiliated revenues.

[31] Amounts include affiliated and nonaffiliated revenues.

[32] Amounts include affiliated and nonaffiliated revenues.

[33] Generation & Marketing includes economic hedge activity.

[34] 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.