Revenue from Contracts with Customers (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Disaggregation of Revenue
Revenue from Contract with Customers	$ 18,982,300,000		$ 19,639,500,000		$ 16,792,000,000
Revenues	18,982,300,000		19,639,500,000		16,792,000,000
Revenue, Performance Obligation
Fixed Performance Obligations	363,300,000
2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	84,400,000
2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	167,200,000
2027-2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	84,400,000
After 2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	27,300,000
Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	14,947,200,000		14,453,100,000		12,157,600,000
Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	7,088,400,000		6,995,900,000		6,090,800,000
Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	4,176,000,000		3,941,700,000		3,289,700,000
Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	3,389,400,000	[1]	3,254,200,000	[2]	2,562,600,000
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	293,400,000		261,300,000		214,500,000
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	4,078,500,000		4,440,800,000		4,014,500,000
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	773,800,000		1,229,500,000		1,080,500,000
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,476,200,000	[3]	1,380,200,000	[4]	1,178,300,000	[5]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	73,900,000	[1]	121,100,000	[2]	83,300,000	[6]
Retail, Trading and Marketing Revenue [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,754,600,000	[7]	1,710,000,000	[2]	1,672,400,000	[8]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	429,100,000	[9]	497,800,000	[10]	350,900,000	[6]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	19,454,800,000		19,391,700,000		16,523,000,000
Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(472,500,000)		247,800,000		269,000,000.0
Alternative [Member]
Disaggregation of Revenue
Revenues	(117,100,000)	[11]	(112,500,000)	[12]	41,400,000	[13]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	458,100,000		408,200,000		367,400,000
Revenues	(355,400,000)	[1],[14]	360,300,000	[2],[15]	227,600,000	[6],[16]
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,906,100,000		1,848,000,000		1,587,700,000
Revenues	1,901,900,000		1,846,800,000		1,593,800,000
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member] | Related Party
Current Assets
Affiliated Companies	0		100,000
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,251,200,000		1,259,600,000		1,049,000,000
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	655,500,000		667,200,000		550,300,000
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	415,200,000		417,500,000		358,500,000
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	145,000,000.0	[17]	139,600,000	[18]	108,900,000
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	35,500,000		35,300,000		31,300,000
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	619,000,000.0		563,800,000		497,500,000
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[19]	0	[20]	0	[21]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	619,000,000.0	[22]	563,800,000	[23]	497,500,000	[24]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	35,900,000	[25]	24,600,000	[26]	41,200,000	[27]
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(4,200,000)		(1,200,000)		6,100,000
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(4,200,000)	[28]	(1,200,000)	[29]	6,100,000	[30]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	5,000,000.0		3,600,000		3,500,000
Revenues	0	[17]	0	[18]	0	[31]
AEP Transmission Co [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,720,600,000		1,651,700,000		1,410,900,000
Revenues	1,672,000,000		1,624,500,000		1,469,300,000
AEP Transmission Co [Member] | Short-term Contract with Customer [Member] | Related Party
Current Assets
Affiliated Companies	123,200,000		113,800,000
AEP Transmission Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[17]	0	[18]	0
AEP Transmission Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,703,900,000		1,643,500,000		1,393,900,000
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[19]	0	[20]	0	[21]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,703,900,000	[22]	1,643,500,000	[23]	1,393,900,000	[24]
AEP Transmission Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	1,400,000,000		1,300,000,000		1,100,000,000
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	16,700,000	[25]	8,200,000	[26]	17,000,000.0	[27]
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(48,600,000)		(27,200,000)		58,400,000
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(48,600,000)	[28]	(27,200,000)	[29]	58,400,000	[30]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers			(200,000)		300,000
Revenues	0	[17]	0	[18]	0	[31]
Appalachian Power Co [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	3,740,600,000		3,520,700,000		3,092,900,000
Revenues	3,720,700,000		3,519,900,000		3,105,200,000
Revenue, Performance Obligation
Fixed Performance Obligations	83,200,000
Appalachian Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	239,300,000		256,100,000		197,900,000
Current Assets
Affiliated Companies	98,800,000		94,000,000.0
Appalachian Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Current Assets
Affiliated Companies	71,700,000		64,500,000
Appalachian Power Co [Member] | 2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	16,100,000
Appalachian Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	32,200,000
Appalachian Power Co [Member] | 2027-2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	23,200,000
Appalachian Power Co [Member] | After 2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	11,700,000
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	3,197,200,000		2,953,200,000		2,591,000,000
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,612,900,000		1,558,700,000		1,379,600,000
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	699,600,000		643,400,000		556,300,000
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	778,400,000	[17]	664,000,000.0	[18]	584,300,000
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	106,300,000		87,100,000		70,800,000
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	469,200,000		466,900,000		431,500,000
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	288,200,000	[19]	299,900,000	[20]	302,700,000	[21]
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	159,000,000		170,000,000		129,000,000
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	181,000,000.0	[22]	167,000,000.0	[23]	128,800,000	[24]
Appalachian Power Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	93,000,000		78,000,000
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	74,200,000	[25]	100,600,000	[26]	70,400,000	[27]
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(19,900,000)		(800,000)		12,300,000
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(20,100,000)	[28]	(1,300,000)	[29]	12,300,000	[30]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	17,300,000		18,300,000		11,800,000
Revenues	200,000	[17]	500,000	[18]	0	[31]
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,522,300,000		2,659,700,000		2,330,700,000
Revenues	2,535,900,000		2,669,600,000		2,326,700,000
Revenue, Performance Obligation
Fixed Performance Obligations	26,500,000
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Current Assets
Affiliated Companies	44,000,000.0		75,300,000
Indiana Michigan Power Co [Member] | 2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	4,400,000
Indiana Michigan Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	8,800,000
Indiana Michigan Power Co [Member] | 2027-2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	8,800,000
Indiana Michigan Power Co [Member] | After 2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations	4,500,000
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,036,300,000		2,010,500,000		1,874,800,000
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	841,900,000		852,400,000		805,400,000
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	575,200,000		550,200,000		507,200,000
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	614,200,000	[17]	602,900,000	[18]	557,000,000.0
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	5,000,000.0		5,000,000.0		5,200,000
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	365,700,000		526,800,000		351,800,000
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	327,100,000	[19]	490,000,000.0	[20]	318,100,000	[21]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	38,600,000	[22]	36,800,000	[23]	33,700,000	[24]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	120,300,000	[25]	122,400,000	[26]	104,100,000	[27]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	68,000,000		62,000,000		60,000,000
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	13,600,000		9,900,000		(4,000,000.0)
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(10,900,000)	[28]	10,000,000.0	[29]	(4,000,000.0)	[30]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	12,300,000		11,700,000		7,700,000
Revenues	24,500,000	[17]	(100,000)	[18]	0	[31]
Ohio Power Co [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	3,802,800,000		3,672,100,000		2,837,500,000
Revenues	3,811,400,000		3,665,100,000		2,899,100,000
Ohio Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Current Assets
Affiliated Companies	70,100,000		49,900,000
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	3,547,900,000		3,363,500,000		2,609,500,000
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,953,700,000		1,830,200,000		1,587,900,000
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,082,000,000		947,700,000		722,700,000
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	497,100,000	[17]	571,700,000	[18]	286,300,000
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	15,100,000		13,900,000		12,600,000
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	82,600,000		86,200,000		74,900,000
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[19]	0	[20]	0	[21]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	82,600,000	[22]	86,200,000	[23]	74,900,000	[24]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	172,300,000	[25]	222,400,000	[26]	153,100,000	[27]
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	8,600,000		(7,000,000.0)		61,600,000
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(15,300,000)	[28]	(25,600,000)	[29]	42,600,000	[30]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	12,300,000		11,000,000.0		10,600,000
Revenues	23,900,000	[17]	18,600,000	[18]	19,000,000.0	[31]
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,976,600,000		1,875,700,000		1,474,300,000
Revenues	1,977,000,000		1,874,700,000		1,474,400,000
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member] | Related Party
Current Assets
Affiliated Companies	12,400,000		18,800,000
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,905,900,000		1,780,900,000		1,382,600,000
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	831,200,000		816,300,000		651,900,000
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	538,800,000		489,200,000		378,900,000
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	423,100,000	[17]	372,500,000	[18]	274,100,000
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	112,800,000		102,900,000		77,700,000
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	49,200,000		65,700,000		60,400,000
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	11,700,000	[19]	26,500,000	[20]	22,900,000	[21]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	37,500,000	[22]	39,200,000	[23]	37,500,000	[24]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	21,500,000	[25]	29,100,000	[26]	31,300,000	[27]
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	400,000		(1,000,000.0)		100,000
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	500,000	[28]	(1,000,000.0)	[29]	100,000	[30]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	7,400,000		6,200,000		4,900,000
Revenues	(100,000)	[17]	0	[18]	0	[31]
Southwestern Electric Power Co [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,192,100,000		2,283,200,000		2,126,000,000
Revenues	2,182,800,000		2,284,400,000		2,131,800,000
Southwestern Electric Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	81,600,000		59,500,000		41,400,000
Current Assets
Affiliated Companies	47,200,000		65,400,000
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Current Assets
Affiliated Companies	27,400,000		19,100,000
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,834,900,000		1,836,600,000		1,593,200,000
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	799,500,000		820,700,000		709,500,000
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	609,400,000		612,300,000		529,300,000
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	415,900,000	[17]	393,500,000	[18]	344,400,000
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	10,100,000		10,100,000		10,000,000.0
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	327,700,000		421,900,000		509,300,000
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	176,900,000	[19]	273,200,000	[20]	386,600,000	[21]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	150,800,000	[22]	148,700,000	[23]	122,700,000	[24]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	73,000,000		51,000,000
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	29,500,000	[25]	24,700,000	[26]	23,500,000	[27]
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(9,300,000)		1,200,000		5,800,000
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(9,400,000)	[28]	1,200,000	[29]	5,800,000	[30]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,400,000		1,900,000		1,900,000
Revenues	100,000	[17]	0	[18]	0	[31]
Consolidation Eliminations [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Revenues	(1,709,200,000)		(1,603,800,000)		(1,461,500,000)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	(900,000)		(900,000)		(800,000)
Consolidation Eliminations [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Consolidation Eliminations [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Consolidation Eliminations [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	(900,000)	[1]	(900,000)	[2]	(800,000)
Consolidation Eliminations [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Consolidation Eliminations [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	(1,507,200,000)		(1,431,300,000)		(1,261,200,000)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	(1,418,300,000)	[3]	(1,413,200,000)	[4]	(1,206,000,000)	[5]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	(6,700,000)	[1]	(8,000,000.0)	[2]	(3,600,000)	[6]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenue [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	(82,200,000)	[7]	(10,100,000)	[2]	(51,600,000)	[8]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	(160,300,000)	[9]	(104,800,000)	[10]	(115,200,000)	[6]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	(1,668,400,000)		(1,537,000,000)		(1,377,200,000)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(40,800,000)		(66,800,000)		(84,300,000)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(25,500,000)	[11]	(57,700,000)	[12]	(73,600,000)	[13]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues	(15,300,000)	[1],[14]	(9,100,000)	[2],[15]	(10,700,000)	[6],[16]
Consolidation Eliminations [Member] | AEP Transmission Co [Member]
Disaggregation of Revenue
Revenues	0		0		0
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers			0		0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues	11,449,500,000		11,477,500,000		9,998,500,000
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	10,149,000,000		9,831,100,000		8,499,900,000
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	4,479,300,000		4,498,600,000		3,952,600,000
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,678,800,000		2,576,500,000		2,208,500,000
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,748,200,000	[1]	2,543,800,000	[2]	2,168,200,000
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	242,700,000		212,200,000		170,600,000
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,106,500,000		1,401,100,000		1,298,100,000
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	662,500,000		958,300,000		942,600,000
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	444,000,000.0	[3]	442,800,000	[4]	355,500,000	[5]
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	205,000,000
Vertically Integrated Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[1]	0	[2]	0	[6]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenue [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[7]	0	[2]	0	[8]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	204,400,000	[9]	241,100,000	[10]	187,500,000	[6]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	11,459,900,000		11,473,300,000		9,985,500,000
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(10,400,000)		4,200,000		13,000,000.0
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(35,000,000.0)	[11]	3,800,000	[12]	13,500,000	[13]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues	24,600,000	[1],[14]	400,000	[2],[15]	(500,000)	[6],[16]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues	5,713,300,000		5,512,000,000		4,492,900,000
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	4,799,100,000		4,622,900,000		3,658,500,000
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,609,100,000		2,497,300,000		2,138,200,000
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,497,200,000		1,365,200,000		1,081,200,000
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	642,100,000	[1]	711,300,000	[2]	395,200,000
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	50,700,000		49,100,000		43,900,000
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	701,600,000		650,000,000.0		572,400,000
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	701,600,000	[3]	650,000,000.0	[4]	572,400,000	[5]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[1]	0	[2]	0	[6]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenue [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[7]	0	[2]	0	[8]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	208,100,000	[9]	247,300,000	[10]	194,200,000	[6]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	5,708,800,000		5,520,200,000		4,425,100,000
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	4,500,000		(8,200,000)		67,800,000
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(19,500,000)	[11]	(26,800,000)	[12]	48,800,000	[13]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues	24,000,000.0	[1],[14]	18,600,000	[2],[15]	19,000,000.0	[6],[16]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues	1,728,500,000		1,677,000,000		1,526,200,000
AEP Transmission Holdco [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Holdco [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Holdco [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Holdco [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[1]	0	[2]	0
AEP Transmission Holdco [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Holdco [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,748,900,000		1,700,600,000		1,456,400,000
AEP Transmission Holdco [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
AEP Transmission Holdco [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,748,900,000	[3]	1,700,600,000	[4]	1,456,400,000	[5]
AEP Transmission Holdco [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	1,500,000,000		1,300,000,000		1,100,000,000
AEP Transmission Holdco [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[1]	0	[2]	0	[6]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenue [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[7]	0	[2]	0	[8]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	16,800,000	[9]	8,200,000	[10]	17,100,000	[6]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,765,700,000		1,708,800,000		1,473,500,000
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(37,200,000)		(31,800,000)		52,700,000
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	(37,100,000)	[11]	(31,800,000)	[12]	52,700,000	[13]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues	(100,000)	[1],[14]	0	[2],[15]	0	[6],[16]
Generation and Marketing [Member]
Disaggregation of Revenue
Revenues	1,632,200,000		2,466,900,000		2,163,700,000
Generation and Marketing [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Generation and Marketing [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Generation and Marketing [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Generation and Marketing [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[1]	0	[2]	0
Generation and Marketing [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Generation and Marketing [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,028,100,000		2,113,500,000		1,947,400,000
Generation and Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	111,300,000		271,200,000		137,900,000
Generation and Marketing [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[3]	0	[4]	0	[5]
Generation and Marketing [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	80,600,000	[1]	129,100,000	[2]	86,900,000	[6]
Generation and Marketing [Member] | Retail, Trading and Marketing Revenue [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	1,836,200,000	[7]	1,713,200,000	[2]	1,722,600,000	[8]
Generation and Marketing [Member] | Retail, Trading and Marketing Revenue [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	82,000,000				52,000,000
Generation and Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	8,600,000	[9]	12,100,000	[10]	7,200,000	[6]
Generation and Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	2,036,700,000		2,125,600,000		1,954,600,000
Generation and Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	(404,500,000)		341,300,000		209,100,000
Generation and Marketing [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	0	[11]	0	[12]	0	[13]
Generation and Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues	(404,500,000)	[1],[14]	341,300,000	[2],[15]	209,100,000	[6],[16]
Corporate and Other [Member]
Disaggregation of Revenue
Revenues	168,000,000.0		109,900,000		72,200,000
Corporate and Other [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Corporate and Other [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Corporate and Other [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Corporate and Other [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[1]	0	[2]	0
Corporate and Other [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Corporate and Other [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	600,000		6,900,000		1,400,000
Corporate and Other [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0		0		0
Corporate and Other [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[3]	0	[4]	0	[5]
Corporate and Other [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	0	[1]	0	[2]	0	[6]
Corporate and Other [Member] | Retail, Trading and Marketing Revenue [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	600,000	[7]	6,900,000	[2]	1,400,000	[8]
Corporate and Other [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	151,500,000	[9]	93,900,000	[10]	60,100,000	[6]
Corporate and Other [Member] | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contract with Customers	100,000,000		59,000,000
Corporate and Other [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contract with Customers	152,100,000		100,800,000		61,500,000
Corporate and Other [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues	15,900,000		9,100,000		10,700,000
Corporate and Other [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues	0	[11]	0	[12]	0	[13]
Corporate and Other [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues	$ 15,900,000	[1],[14]	$ 9,100,000	[2],[15]	$ 10,700,000	[6],[16]

[1] Amounts include affiliated and nonaffiliated revenues.

[2] Amounts include affiliated and nonaffiliated revenues.

[3] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.5 billion and Vertically Integrated Utilities was $205 million. The remaining affiliated amounts were immaterial.

[4] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.3 billion. The remaining affiliated amounts were immaterial.

[5] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.1 billion. The remaining affiliated amounts were immaterial.

[6] Amounts include affiliated and nonaffiliated revenues.

[7] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $82 million. The remaining affiliated amounts were immaterial.

[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $52 million. The remaining affiliated amounts were immaterial.

[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $100 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $59 million. The remaining affiliated amounts were immaterial.

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

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

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

[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.

[19] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $159 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[20] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $170 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 $129 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[22] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.4 billion, APCo was $93 million and SWEPCo was $73 million. The remaining affiliated amounts were immaterial.

[23] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.3 billion, APCo was $78 million and SWEPCo was $51 million. The remaining affiliated amounts were immaterial.

[24] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.1 billion. The remaining affiliated amounts were immaterial.

[25] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $68 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[26] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $62 million primarily relating 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 $60 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

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

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

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

[31] Amounts include affiliated and nonaffiliated revenues.