Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022		Mar. 31, 2021		Dec. 31, 2021
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 4,592.6		$ 4,281.1
Revenues		4,592.6		4,281.1
Revenue, Performance Obligation
Fixed Performance Obligations		1,350.9
Revenue Textuals
Revenue from Related Parties		0.0		0.0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,368.9		2,936.9
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,751.4		1,594.2
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		862.6		725.4
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		695.9		569.5
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		59.0		47.8
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		945.0		1,234.6
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		227.5		393.1
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		312.9	[1]	280.6	[2]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.6	[3]	21.7	[4]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		383.0	[5]	539.2	[6]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		119.1	[3]	87.9	[4]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4,433.0		4,259.4
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		159.6		21.7
Alternative [Member]
Disaggregation of Revenue
Revenues		(5.8)	[3]	16.9	[4]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		94.1		92.6
Revenues		165.4	[3]	4.8	[4]
2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		926.3
2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		164.7
2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		157.8
After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		102.1
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		416.7		364.2
Revenue, Performance Obligation
Fixed Performance Obligations		410.0
Affiliated Companies - Contracts with Customers		6.1				$ 7.9
Revenue Textuals
Revenue from Related Parties		0.9		1.0
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		275.6		236.7
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		141.9		122.7
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		94.9		80.7
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		30.6		26.5
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.2		6.8
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		133.1		112.0
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[7]	0.0	[8]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		133.1	[9]	112.0	[10]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.3	[11]	16.2	[12]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		418.0		364.9
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(1.3)		(0.7)
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(1.3)	[13]	(0.7)	[14]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.1		1.5
Revenues		0.0	[13]	0.0	[14]
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		0.7				0.4
AEP Texas Inc. [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		410.0
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
Revenues		400.4		361.7
Revenue, Performance Obligation
Fixed Performance Obligations		1,104.2
Affiliated Companies - Contracts with Customers		110.6				96.1
Revenue Textuals
Revenue from Related Parties		324.7		285.6
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		0.0
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		400.3		345.2
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[7]	0.0	[8]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		400.3	[9]	345.2	[10]
Revenue Textuals
Revenue from Related Parties		323.0		270.0
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.3)	[11]	4.6	[12]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		400.0		349.8
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0.4		11.9
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.4	[13]	11.9	[14]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.1
Revenues		0.0	[13]	0.0	[14]
AEP Transmission Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		110.5				95.5
AEP Transmission Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		1,104.2
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		907.3		817.0
Revenue, Performance Obligation
Fixed Performance Obligations		215.9
Affiliated Companies - Contracts with Customers		76.4				129.9
Revenue Textuals
Revenue from Related Parties		56.9		50.1
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		786.3		694.9
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		458.0		416.9
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		153.9		130.2
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		153.8		130.9
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		20.6		16.9
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		97.3		106.6
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		56.2	[7]	72.4	[8]
Revenue Textuals
Revenue from Related Parties		36.0		32.0
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		41.1	[9]	34.2	[10]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		24.3	[11]	13.1	[12]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		907.9		814.6
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.6)		2.4
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.7)	[13]	2.2	[14]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.3		2.7
Revenues		0.1	[13]	0.2	[14]
Appalachian Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		60.9				117.8
Appalachian Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		147.8
Appalachian Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		32.2
Appalachian Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		24.3
Appalachian Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		11.6
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenues		625.2		564.5
Revenue, Performance Obligation
Fixed Performance Obligations		47.0
Affiliated Companies - Contracts with Customers		50.9				78.2
Revenue Textuals
Revenue from Related Parties		2.0		0.8
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		496.2		457.0
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		231.8		213.6
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		126.6		113.6
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		136.5		128.4
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.3		1.4
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		99.2		87.9
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		90.4	[7]	79.6	[8]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.8	[9]	8.3	[10]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		29.9	[11]	20.7	[12]
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		625.3		565.6
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.1)		(1.1)
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[13]	(1.1)	[14]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.8		1.7
Revenues		(0.1)	[13]	0.0	[14]
Revenue Textuals
Revenue from Related Parties		10.0		16.0
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		37.3				61.2
Indiana Michigan Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		24.9
Indiana Michigan Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8
Indiana Michigan Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8
Indiana Michigan Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		4.5
Ohio Power Co [Member]
Disaggregation of Revenue
Revenues		830.0		723.9
Revenue, Performance Obligation
Fixed Performance Obligations		55.4
Affiliated Companies - Contracts with Customers		77.6				71.8
Revenue Textuals
Revenue from Related Parties		3.7		4.8
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		759.4		646.2
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		458.7		425.3
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		194.7		158.5
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		102.7		59.2
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.3		3.2
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.8		18.5
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[7]	0.0	[8]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.8	[9]	18.5	[10]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		44.6	[11]	36.0	[12]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		825.8		700.7
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		4.2		23.2
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.1)	[13]	17.9	[14]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.1		2.4
Revenues		6.3	[13]	5.3	[14]
Ohio Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		53.6				51.7
Ohio Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		55.4
Ohio Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0
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		387.6		296.1
Revenue, Performance Obligation
Fixed Performance Obligations		8.4
Affiliated Companies - Contracts with Customers		24.6				35.0
Revenue Textuals
Revenue from Related Parties		0.6		1.0
Payments to Acquire Property, Plant, and Equipment		549.3		0.0
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		363.2		281.6
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		165.9		136.8
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		97.5		72.7
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		78.6		56.4
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.2		15.7
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		19.1		2.3
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.5	[7]	(7.1)	[8]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.6	[9]	9.4	[10]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.4	[11]	12.6	[12]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		387.7		296.5
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.1)		(0.4)
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.1)	[13]	(0.4)	[14]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.6		1.5
Revenues		0.0	[13]	0.0	[14]
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		13.9				18.8
Public Service Co Of Oklahoma [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.4
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		494.8		616.1
Revenue, Performance Obligation
Fixed Performance Obligations		31.5
Affiliated Companies - Contracts with Customers		28.4				38.3
Revenue Textuals
Revenue from Related Parties		10.0		7.8
Payments to Acquire Property, Plant, and Equipment		658.0		0.0
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		393.5		352.1
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		175.9		166.3
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		130.5		112.9
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		84.7		70.6
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.4		2.3
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		96.4		257.5
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		61.2	[7]	228.6	[8]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		35.2	[9]	28.9	[10]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.3	[11]	6.4	[12]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		495.2		616.0
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.4)		0.1
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.4)	[13]	0.1	[14]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.6		0.6
Revenues		0.0	[13]	0.0	[14]
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		19.5				$ 24.7
Southwestern Electric Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		31.5
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		(392.2)		(368.4)
Revenue Textuals
Revenue from Related Parties		(392.2)		(368.4)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.4)		(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		(0.4)		(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		(371.6)		(331.8)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(361.8)	[1]	(299.3)	[2]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.8)	[3]	(0.7)	[4]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(9.0)	[5]	(31.8)	[6]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(18.6)	[3]	(21.2)	[4]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(390.6)		(353.2)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(1.6)		(15.2)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		1.3	[3]	(11.6)	[4]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(2.9)	[3]	(3.6)	[4]
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
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers				0.0
North Central Wind Energy Facilities
Revenue Textuals
Payments to Acquire Property, Plant, and Equipment		(1,207.3)		0.0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		2,687.4		2,537.3
Revenue Textuals
Revenue from Related Parties		40.6		32.8
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,334.1		2,054.1
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,150.8		1,046.1
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		572.9		486.2
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		563.0		484.0
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		47.4		37.8
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		292.5		441.6
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		187.2		352.6
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		105.3	[1]	89.0	[2]
Vertically Integrated Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[3]	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	[6]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		61.6	[3]	42.3	[4]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,688.2		2,538.0
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.8)		(0.7)
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.8)	[3]	(0.7)	[4]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[3]	0.0	[4]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,246.8		1,088.1
Revenue Textuals
Revenue from Related Parties		4.6		5.8
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,035.2		883.0
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		600.6		548.1
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		289.7		239.2
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		133.3		85.7
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		11.6		10.0
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		154.9		130.5
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		154.9	[1]	130.5	[2]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[3]	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	[6]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		53.8	[3]	52.1	[4]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,243.9		1,065.6
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.9		22.5
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(3.4)	[3]	17.2	[4]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		6.3	[3]	5.3	[4]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		411.4		377.0
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		414.5		360.4
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		414.5	[1]	360.4	[2]
Revenue Textuals
Revenue from Related Parties		327.0		273.0
AEP Transmission Holdco [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[3]	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	[6]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.2)	[3]	4.6	[4]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		414.3		365.0
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2.9)		12.0
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.9)	[3]	12.0	[4]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[3]	0.0	[4]
Generation And Marketing [Member]
Disaggregation of Revenue
Revenues		619.3		634.2
Revenue Textuals
Revenue from Related Parties		9.8		32.5
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		451.5		632.7
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		40.3		40.5
Revenue Textuals
Revenue from Related Parties		9.0		32.0
Generation And Marketing [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[1]	0.0	[2]
Generation And Marketing [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		22.4	[3]	22.4	[4]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		388.8	[5]	569.8	[6]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.6	[3]	1.5	[4]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		460.1		634.2
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		159.2		0.0
Generation And Marketing [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[3]	0.0	[4]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		159.2	[3],[15]	0.0	[4]
Other Segments [Member]
Disaggregation of Revenue
Revenues	[16]	19.9		12.9
Revenue Textuals
Revenue from Related Parties	[16]	9.2		8.2
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		3.2		1.2
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	[1]	0.0	[2]
Other Segments [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[3]	0.0	[4]
Other Segments [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.2	[5]	1.2	[6]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		13.9	[3]	8.6	[4]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		17.1		9.8
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.8		3.1
Other Segments [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[3]	0.0	[4]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers	[16]	10.7		4.7
Revenues		$ 2.8	[3]	$ 3.1	[4]

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

[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $273 million. The remaining affiliated amounts were immaterial.

[3] Amounts include affiliated and nonaffiliated revenues.

[4] Amounts include affiliated and nonaffiliated revenues

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

[6] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $32 million. The remaining affiliated amounts were immaterial.

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

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

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

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $270 million. The remaining affiliated amounts were immaterial.

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

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $16 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[13] Amounts include affiliated and nonaffiliated revenues.

[14] Amounts include affiliated and nonaffiliated revenues.

[15] Generation & Marketing includes economic hedge activity.

[16] 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.