Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024		Mar. 31, 2023		Dec. 31, 2023
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 5,025.7		$ 4,690.9
Revenues		5,025.7		4,690.9
Revenue, Performance Obligation
Fixed Performance Obligations		337.9
Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,810.4		3,788.4
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,916.1		1,827.2
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,042.1		1,009.3
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		783.0	[1]	883.0
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		69.2		68.9
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,162.8		977.1
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		263.4		215.2
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		368.8	[2]	327.2	[3]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4.9	[1]	21.2	[4]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		525.7	[5]	413.5	[4]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		111.8	[6]	65.3	[7]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5,085.0		4,830.8
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(59.3)		(139.9)
Alternative [Member]
Disaggregation of Revenue
Revenues		1.5	[8]	(10.0)	[9]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		125.4		92.4
Revenues		(60.8)	[1],[10]	(129.9)	[4],[11]
2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		62.3
2025-2026[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		166.8
2027-2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		84.1
After 2028
Revenue, Performance Obligation
Fixed Performance Obligations		24.7
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		466.4		429.5
AEP Texas Inc. [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		1.3		1.2
Revenue Textuals
Affiliated Companies - Contracts with Customers		21.2				$ 23.8
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		303.5		275.6
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		147.3		130.7
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		110.9		97.3
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		35.6	[12]	39.3
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.7		8.3
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		155.9		146.3
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[13]	0.0	[14]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		155.9	[15]	146.3	[16]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.8	[17]	9.7	[18]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		468.2		431.6
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(1.8)		(2.1)
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(1.8)	[19]	(2.1)	[20]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.1		0.6
Revenues		0.0	[12]	0.0	[21]
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		0.0				0.0
AEP Transmission Co [Member]
Disaggregation of Revenue
Revenues		482.8		441.6
AEP Transmission Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		389.4		357.4
Revenue Textuals
Affiliated Companies - Contracts with Customers		131.1				125.5
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	[12]	0.0
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		475.4		438.7
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[13]	0.0	[14]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		475.4	[15]	438.7	[16]
AEP Transmission Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		384.0		349.0
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.1	[17]	3.7	[18]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		483.5		442.4
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.7)		(0.8)
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.7)	[19]	(0.8)	[20]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.4		0.0
Revenues		0.0	[12]	0.0	[21]
AEP Transmission Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		129.2				123.2
Appalachian Power Co [Member]
Disaggregation of Revenue
Revenues		1,093.0		987.7
Revenue, Performance Obligation
Fixed Performance Obligations		80.3
Appalachian Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		63.1		69.6
Revenue Textuals
Affiliated Companies - Contracts with Customers		100.9				98.8
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		939.1		853.8
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		526.3		470.5
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		188.3		171.3
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		196.4	[12]	185.8
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		28.1		26.2
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		132.2		121.6
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		85.1	[13]	80.2	[14]
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		41.0		47.0
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		47.1	[15]	41.4	[16]
Appalachian Power Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		21.0
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.7	[17]	13.0	[18]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,093.0		988.4
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0.0		(0.7)
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.1)	[19]	(0.7)	[20]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.6		3.6
Revenues		0.1	[12]	0.0	[21]
Appalachian Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		77.8				71.7
Appalachian Power Co [Member] | 2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		12.1
Appalachian Power Co [Member] | 2025-2026[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		32.2
Appalachian Power Co [Member] | 2027-2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		24.3
Appalachian Power Co [Member] | After 2028
Revenue, Performance Obligation
Fixed Performance Obligations		11.7
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenues		667.4		663.0
Revenue, Performance Obligation
Fixed Performance Obligations		25.4
Indiana Michigan Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		1.8		1.2
Revenue Textuals
Affiliated Companies - Contracts with Customers		87.4				65.0
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		518.8		532.4
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		224.8		239.6
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		144.8		138.9
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		147.9	[12]	152.6
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.3		1.3
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		147.4		112.1
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		137.3	[13]	104.0	[14]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		10.1	[15]	8.1	[16]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		27.6	[17]	21.4	[18]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		18.0		18.0
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		693.8		665.9
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(26.4)		(2.9)
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.5)	[19]	(2.9)	[20]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.8		3.1
Revenues		(25.9)	[12]	0.0	[21]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		15.0		15.9
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		55.8				44.0
Indiana Michigan Power Co [Member] | 2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		3.3
Indiana Michigan Power Co [Member] | 2025-2026[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8
Indiana Michigan Power Co [Member] | 2027-2028 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8
Indiana Michigan Power Co [Member] | After 2028
Revenue, Performance Obligation
Fixed Performance Obligations		4.5
Ohio Power Co [Member]
Disaggregation of Revenue
Revenues		1,023.8		1,034.6
Ohio Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		5.7		7.6
Revenue Textuals
Affiliated Companies - Contracts with Customers		131.5				129.2
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		947.3		981.9
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		556.5		526.0
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		286.1		278.5
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		100.5	[12]	173.6
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4.2		3.8
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		23.8		17.9
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[13]	0.0	[14]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		23.8	[15]	17.9	[16]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		42.2	[17]	33.2	[18]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,013.3		1,033.0
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		10.5		1.6
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		2.6	[19]	(9.5)	[20]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.7		5.2
Revenues		7.9	[12]	11.1	[21]
Ohio Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		72.3				70.1
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenues		387.8		417.0
Public Service Co Of Oklahoma [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		3.5		0.7
Revenue Textuals
Affiliated Companies - Contracts with Customers		69.1				31.0
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		363.0		402.5
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		158.2		170.9
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		103.0		109.1
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		80.3	[12]	98.3
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.5		24.2
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		13.0		12.2
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.2	[13]	0.9	[14]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		10.8	[15]	11.3	[16]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		12.0	[17]	2.3	[18]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		388.0		417.0
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.2)		0.0
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.2)	[19]	0.0	[20]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6.2		1.5
Revenues		0.0	[12]	0.0	[21]
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		10.8				12.4
Southwestern Electric Power Co [Member]
Disaggregation of Revenue
Revenues		516.2		515.9
Southwestern Electric Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		12.1		11.7
Revenue Textuals
Affiliated Companies - Contracts with Customers		61.2				47.2
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		420.0		426.2
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		182.4		175.9
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		140.0		143.5
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		95.0	[12]	104.2
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.6		2.6
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		86.7		82.5
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		47.1	[13]	39.6	[14]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		39.6	[15]	42.9	[16]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		14.0
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.6	[17]	7.9	[18]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		516.3		516.6
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.1)		(0.7)
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.1)	[19]	(0.7)	[20]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.9		0.5
Revenues		0.0	[12]	0.0	[21]
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		16.1				$ 27.4
Consolidation Eliminations [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0
Revenues		(526.0)		(443.7)
Consolidation Eliminations [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers	[22]	(526.0)		(443.7)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.2)		(0.2)
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		(0.2)	[1]	(0.2)
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		(466.1)		(401.8)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.1		0.0
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(418.6)	[2]	(401.8)	[3]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(1.4)	[1]	(0.1)	[4]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(46.2)	[5]	0.1	[4]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(68.7)	[6]	(43.7)	[7]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(535.0)		(445.7)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		9.0		2.0
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		1.0	[8]	2.9	[9]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		8.0	[1],[10]	(0.9)	[4],[11]
Consolidation Eliminations [Member] | AEP Transmission Co [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0
Revenues		0.0		0.0
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		2,947.9		2,857.8
Vertically Integrated Utilities [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		46.7		41.5
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,559.8		2,530.9
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,212.3		1,170.4
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		645.1		633.4
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		647.1	[1]	670.3
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		55.3		56.8
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		354.8		297.5
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		235.9		182.8
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		118.9	[2]	114.7	[3]
Vertically Integrated Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[1]	0.0	[4]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[5]	0.0	[4]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		59.7	[6]	32.6	[7]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,974.3		2,861.0
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(26.4)		(3.2)
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.7)	[8]	(3.1)	[9]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(25.7)	[1],[10]	(0.1)	[4],[11]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,490.2		1,464.2
Transmission And Distribution Utilities [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		7.0		8.9
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,250.8		1,257.7
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		703.8		656.8
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		397.0		375.9
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		136.1	[1]	212.9
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		13.9		12.1
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		179.8		164.2
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		179.8	[2]	164.2	[3]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[1]	0.0	[4]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[5]	0.0	[4]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		51.0	[6]	42.8	[7]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,481.6		1,464.7
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		8.6		(0.5)
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.7	[8]	(11.6)	[9]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		7.9	[1],[10]	11.1	[4],[11]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		497.3		455.5
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	[1]	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		488.7		450.1
AEP Transmission Holdco [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0
AEP Transmission Holdco [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		488.7	[2]	450.1	[3]
AEP Transmission Holdco [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		387.0		357.0
AEP Transmission Holdco [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[1]	0.0	[4]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[5]	0.0	[4]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.1	[6]	3.6	[7]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		496.8		453.7
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0.5		1.8
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.5	[8]	1.8	[9]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[1],[10]	0.0	[4],[11]
Generation And Marketing [Member]
Disaggregation of Revenue
Revenues		563.5		327.0
Generation And Marketing [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		47.6		0.1
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	[1]	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		605.1		467.4
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		27.4		32.4
Generation And Marketing [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[2]	0.0	[3]
Generation And Marketing [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6.3	[1]	21.3	[4]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		571.4	[5]	413.7	[4]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		46.0
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.3	[6]	0.6	[7]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		606.4		468.0
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(42.9)		(141.0)
Generation And Marketing [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[8]	0.0	[9]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(42.9)	[1],[10]	(141.0)	[4],[11]
Other Segments [Member]
Disaggregation of Revenue
Revenues	[23]	52.8		30.1
Other Segments [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers	[23]	37.9		27.8
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	[1]	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		0.5		(0.3)
Other Segments [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0
Other Segments [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[2]	0.0	[3]
Other Segments [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[1]	0.0	[4]
Other Segments [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.5	[5]	(0.3)	[4]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		60.4	[6]	29.4	[7]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		60.9		29.1
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(8.1)		1.0
Other Segments [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[8]	0.0	[9]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers	[23]	14.9		2.3
Revenues		(8.1)	[1],[10]	1.0	[4],[11]
Corporate and Other | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 48.0		$ 29.0

[1] Amounts include affiliated and nonaffiliated revenues.

[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $387 million. The remaining affiliated amounts were immaterial.

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

[4] Amounts include affiliated and nonaffiliated revenues

[5] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $46 million. The remaining affiliated amounts were immaterial.

[6] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $48 million. The remaining affiliated amounts were immaterial.

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

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

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

[10] Generation & Marketing includes economic hedge activity.

[11] Generation & Marketing includes economic hedge activity.

[12] Amounts include affiliated and nonaffiliated revenues.

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

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

[15] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $384 million, APCo was $21 million and SWEPCo was $14 million. The remaining affiliated amounts were immaterial.

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

[17] 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.

[18] 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.

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

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

[21] Amounts include affiliated and nonaffiliated revenues.

[22] Represents inter-segment revenues.

[23] 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.