Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2023		Jun. 30, 2022		Jun. 30, 2023		Jun. 30, 2022		Dec. 31, 2022
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 4,372.5		$ 4,639.7		$ 9,063.4		$ 9,232.3
Revenues		4,372.5		4,639.7		9,063.4		9,232.3
Revenue, Performance Obligation
Fixed Performance Obligations		403.0				403.0
Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,459.2		3,367.4		7,247.6		6,736.3
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,536.1		1,540.9		3,363.3		3,292.3
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,001.0		956.5		2,010.3		1,819.1
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		850.9		804.3		1,733.9	[1]	1,500.2
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		71.2		65.7		140.1		124.7
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		940.5		1,077.3		1,917.6		2,022.3
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		161.1		271.4		376.3		498.9
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		350.6	[2]	363.3	[3]	677.8	[4]	676.2	[5]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		30.0	[6]	35.3	[7]	51.2	[1]	56.9	[8]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		398.8	[6]	407.3	[7]	812.3	[9]	790.3	[10]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		117.2	[11]	116.7	[12]	182.5	[13]	235.8	[14]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4,516.9		4,561.4		9,347.7		8,994.4
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(144.4)		78.3		(284.3)		237.9
Alternative [Member]
Disaggregation of Revenue
Revenues		(15.6)	[6],[15]	(57.4)	[7],[16]	(25.6)	[1],[17]	(63.2)	[8],[18]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		94.5		93.5		186.9		187.6
Revenues		(128.8)	[6]	135.7	[7],[19]	(258.7)	[1],[20]	301.1	[8],[21]
2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		43.6				43.6
2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		161.4				161.4
2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		137.1				137.1
After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		60.9				60.9
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		461.2		478.8		890.7		895.5
AEP Texas Inc. [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		1.3		0.8		2.5		1.7
Revenue Textuals
Affiliated Companies - Contracts with Customers		22.9				22.9				$ 11.9
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		289.4		331.6		565.0		607.2
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		144.9		174.9		275.6		316.8
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		100.6		110.6		197.9		205.5
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		35.2		36.6		74.5	[22]	67.2
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.7		9.5		17.0		17.7
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		163.1		143.8		309.4		276.9
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[23]	0.0	[24]	0.0	[25]	0.0	[26]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		163.1	[27]	143.8	[28]	309.4	[29]	276.9	[30]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		10.7	[31]	5.6	[32]	20.4	[33]	14.9	[34]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		463.2		481.0		894.8		899.0
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2.0)		(2.2)		(4.1)		(3.5)
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.0)	[35],[36]	(2.2)	[37],[38]	(4.1)	[22],[39]	(3.5)	[40],[41]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.5		1.1		1.1		2.2
Revenues		0.0	[36]	0.0	[38]	0.0	[22]	0.0	[41]
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		0.0				0.0				0.1
AEP Transmission Co [Member]
Disaggregation of Revenue
Revenues		444.9		364.4		886.5		764.8
AEP Transmission Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		365.8		333.9		723.2		658.9
Revenue Textuals
Affiliated Companies - Contracts with Customers		179.4				179.4				119.5
AEP Transmission Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0	[22]	0.0
AEP Transmission Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		444.7		406.1		883.4		806.4
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[23]	0.0	[24]	0.0	[25]	0.0	[26]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		444.7	[27]	406.1	[28]	883.4	[29]	806.4	[30]
AEP Transmission Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		357.0		330.0		706.0		653.0
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4.1	[31]	0.2	[32]	7.8	[33]	(0.1)	[34]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		448.8		406.3		891.2		806.3
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(3.9)		(41.9)		(4.7)		(41.5)
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(3.9)	[35],[36]	(41.9)	[37],[38]	(4.7)	[22],[39]	(41.5)	[40],[41]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[36]	0.0	[38]	0.0	[22]	0.0	[41]
AEP Transmission Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		123.1				123.1				113.8
Appalachian Power Co [Member]
Disaggregation of Revenue
Revenues		826.5		773.6		1,814.2		1,680.9
Revenue, Performance Obligation
Fixed Performance Obligations		77.3				77.3
Appalachian Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		61.1		63.1		130.7		120.0
Revenue Textuals
Affiliated Companies - Contracts with Customers		121.5				121.5				94.0
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		706.1		647.9		1,559.9		1,434.2
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		324.8		313.2		795.3		771.2
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		163.6		152.6		334.9		306.5
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		192.5		161.9		378.3	[22]	315.7
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		25.2		20.2		51.4		40.8
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		108.1		104.3		229.7		201.6
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		64.2	[23]	63.5	[24]	144.4	[25]	119.7	[26]
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		38.0		42.0		85.0		78.0
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		43.9	[27]	40.8	[28]	85.3	[29]	81.9	[30]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		11.8	[31]	20.6	[32]	24.8	[33]	44.9	[34]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		826.0		772.8		1,814.4		1,680.7
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0.5		0.8		(0.2)		0.2
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.5	[35],[36]	0.8	[37],[38]	(0.2)	[22],[39]	0.1	[40],[41]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.9		5.6		6.5		8.9
Revenues		0.0	[36]	0.0	[38]	0.0	[22]	0.1	[41]
Appalachian Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		68.1				68.1				64.5
Appalachian Power Co [Member] | 2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.1				8.1
Appalachian Power Co [Member] | 2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		32.2				32.2
Appalachian Power Co [Member] | 2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		25.4				25.4
Appalachian Power Co [Member] | After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		11.6				11.6
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenues		599.2		631.0		1,262.2		1,256.2
Revenue, Performance Obligation
Fixed Performance Obligations		24.3				24.3
Indiana Michigan Power Co [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		113.3				113.3				104.0
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		483.7		495.0		1,016.1		991.2
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		185.2		195.2		424.8		427.0
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		141.4		138.6		280.3		265.2
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		155.9		160.0		308.5	[22]	296.5
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.2		1.2		2.5		2.5
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		73.1		102.9		185.2		202.1
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		63.5	[23]	94.2	[24]	167.5	[25]	184.6	[26]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.6	[27]	8.7	[28]	17.7	[29]	17.5	[30]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		45.0	[31]	25.8	[32]	66.4	[33]	55.7	[34]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		17.0
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		601.8		623.7		1,267.7		1,249.0
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2.6)		7.3		(5.5)		7.2
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.6)	[35],[36]	7.3	[37],[38]	(5.5)	[22],[39]	7.3	[40],[41]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.4		2.8		5.5		5.6
Revenues		0.0	[36]	0.0	[38]	0.0	[22]	(0.1)	[41]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers				19.0		35.0		29.0
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		47.3				47.3				75.3
Indiana Michigan Power Co [Member] | 2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		2.2				2.2
Indiana Michigan Power Co [Member] | 2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8				8.8
Indiana Michigan Power Co [Member] | 2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8				8.8
Indiana Michigan Power Co [Member] | After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		4.5				4.5
Ohio Power Co [Member]
Disaggregation of Revenue
Revenues		879.1		822.9		1,913.7		1,652.9
Ohio Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		8.2		3.9		15.8		7.6
Revenue Textuals
Affiliated Companies - Contracts with Customers		126.5				126.5				100.9
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		807.5		737.2		1,789.4		1,496.6
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		429.3		386.7		955.3		845.4
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		257.8		221.1		536.3		415.8
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		116.8		126.0		290.4	[22]	228.7
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.6		3.4		7.4		6.7
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.0		21.1		38.9		42.9
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[23]	0.0	[24]	0.0	[25]	0.0	[26]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.0	[27]	21.1	[28]	38.9	[29]	42.9	[30]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		45.5	[31]	60.2	[32]	78.7	[33]	104.8	[34]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		874.0		818.5		1,907.0		1,644.3
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		5.1		4.4		6.7		8.6
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.9)	[35],[36]	(2.4)	[37],[38]	(10.4)	[22],[39]	(4.5)	[40],[41]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.1		1.8		7.3		3.9
Revenues		6.0	[36]	6.8	[38]	17.1	[22]	13.1	[41]
Ohio Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		68.6				68.6				49.9
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenues		474.7		442.9		891.7		830.5
Public Service Co Of Oklahoma [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		0.1		0.8		0.8		1.4
Revenue Textuals
Affiliated Companies - Contracts with Customers		67.1				67.1				52.2
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		454.3		424.7		856.8		787.9
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		186.5		185.2		357.4		351.1
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		131.7		121.2		240.8		218.7
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		107.8		92.5		206.1	[22]	171.1
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		28.3		25.8		52.5		47.0
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		14.2		9.4		26.4		28.5
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4.3	[23]	0.3	[24]	5.2	[25]	9.8	[26]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.9	[27]	9.1	[28]	21.2	[29]	18.7	[30]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		7.2	[31]	9.6	[32]	9.5	[33]	15.0	[34]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		475.7		443.7		892.7		831.4
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(1.0)		(0.8)		(1.0)		(0.9)
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(1.0)	[35],[36]	(0.8)	[37],[38]	(1.0)	[22],[39]	(0.9)	[40],[41]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.2		2.1		3.7		2.7
Revenues		0.0	[36]	0.0	[38]	0.0	[22]	0.0	[41]
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		30.6				30.6				18.8
Southwestern Electric Power Co [Member]
Disaggregation of Revenue
Revenues		537.8		536.6		1,053.7		1,031.4
Southwestern Electric Power Co [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		63.6				63.6				65.4
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		452.1		436.1		878.3		829.6
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		185.1		188.6		361.0		364.5
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		153.8		146.0		297.3		276.5
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		110.6		97.1		214.8	[22]	181.8
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.6		4.4		5.2		6.8
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		82.2		96.7		164.7		193.1
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		43.9	[23]	57.4	[24]	83.5	[25]	118.6	[26]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		38.3	[27]	39.3	[28]	81.2	[29]	74.5	[30]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		7.0	[31]	6.0	[32]	14.9	[33]	11.3	[34]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		541.3		538.8		1,057.9		1,034.0
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(3.5)		(2.2)		(4.2)		(2.6)
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(3.5)	[35],[36]	(2.2)	[37],[38]	(4.2)	[22],[39]	(2.6)	[40],[41]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.8		0.4		1.3		1.0
Revenues		0.0	[36]	0.0	[38]	0.0	[22]	0.0	[41]
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		42.4				42.4				$ 19.1
Consolidation Eliminations [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Revenues		(464.2)		(373.3)		(907.9)		(765.5)
Consolidation Eliminations [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		(464.2)		(373.3)		(907.9)		(765.5)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.1)		0.0		(0.3)		(0.4)
Consolidation Eliminations [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Consolidation Eliminations [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Consolidation Eliminations [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.1)		0.0		(0.3)	[1]	(0.4)
Consolidation Eliminations [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Consolidation Eliminations [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(415.9)		(337.1)		(817.7)		(708.7)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.1		0.1		0.1		0.1
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(402.8)	[2]	(332.0)	[3]	(804.6)	[4]	(693.8)	[5]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(3.1)	[6]	(2.9)	[7]	(3.2)	[1]	(3.7)	[8]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(10.1)	[6]	(2.3)	[7]	(10.0)	[9]	(11.3)	[10]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(39.9)	[11]	(21.1)	[12]	(83.6)	[13]	(39.7)	[14]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(455.9)		(358.2)		(901.6)		(748.8)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(8.3)		(15.1)		(6.3)		(16.7)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(6.3)	[6],[15]	(13.1)	[7],[16]	(3.4)	[1],[17]	(11.8)	[8],[18]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(2.0)	[6]	(2.0)	[7],[19]	(2.9)	[1],[20]	(4.9)	[8],[21]
Consolidation Eliminations [Member] | AEP Transmission Co [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Revenues		0.0		0.0		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		0.0		0.0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		2,674.5		2,648.5		5,532.3		5,335.9
Vertically Integrated Utilities [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		45.5		53.5		87.0		94.1
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,362.5		2,298.8		4,893.4		4,632.9
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		962.0		979.3		2,132.4		2,130.1
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		642.7		624.8		1,276.1		1,197.7
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		698.9		641.8		1,369.2	[1]	1,204.8
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		58.9		52.9		115.7		100.3
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		254.9		297.1		552.4		589.6
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		141.4		188.3		324.2		375.5
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		113.5	[2]	108.8	[3]	228.2	[4]	214.1	[5]
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers						80.0
Vertically Integrated Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[6]	0.0	[7]	0.0	[1]	0.0	[8]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[6]	0.0	[7]	0.0	[9]	0.0	[10]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers				5.0
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		61.9	[11]	49.2	[12]	94.5	[13]	110.8	[14]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,679.3		2,645.1		5,540.3		5,333.3
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(4.8)		3.4		(8.0)		2.6
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(4.9)	[6],[15]	3.3	[7],[16]	(8.0)	[1],[17]	2.5	[8],[18]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.1	[6]	0.1	[7],[19]	0.0	[1],[20]	0.1	[8],[21]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,340.2		1,301.6		2,804.4		2,548.4
Transmission And Distribution Utilities [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		9.4		4.8		18.3		9.4
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,096.8		1,068.6		2,354.5		2,103.8
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		574.1		561.6		1,230.9		1,162.2
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		358.3		331.7		734.2		621.4
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		152.1		162.5		365.0	[1]	295.8
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		12.3		12.8		24.4		24.4
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		184.1		164.9		348.3		319.8
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		184.1	[2]	164.9	[3]	348.3	[4]	319.8	[5]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[6]	0.0	[7]	0.0	[1]	0.0	[8]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[6]	0.0	[7]	0.0	[9]	0.0	[10]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		56.1	[11]	65.9	[12]	98.9	[13]	119.7	[14]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,337.0		1,299.4		2,801.7		2,543.3
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		3.2		2.2		2.7		5.1
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.9)	[6],[15]	(4.6)	[7],[16]	(14.5)	[1],[17]	(8.0)	[8],[18]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		6.1	[6]	6.8	[7],[19]	17.2	[1],[20]	13.1	[8],[21]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		458.6		378.8		914.1		790.2
AEP Transmission Holdco [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Holdco [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Holdco [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Holdco [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0	[1]	0.0
AEP Transmission Holdco [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Holdco [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		455.8		421.6		905.9		836.1
AEP Transmission Holdco [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Holdco [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		455.8	[2]	421.6	[3]	905.9	[4]	836.1	[5]
AEP Transmission Holdco [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		360.0		334.0		712.0		661.0
AEP Transmission Holdco [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[6]	0.0	[7]	0.0	[1]	0.0	[8]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[6]	0.0	[7]	0.0	[9]	0.0	[10]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4.3	[11]	0.2	[12]	7.9	[13]	0.0	[14]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		460.1		421.8		913.8		836.1
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(1.5)		(43.0)		0.3		(45.9)
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(1.5)	[6],[15]	(43.0)	[7],[16]	0.3	[1],[17]	(45.9)	[8],[18]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[6]	0.0	[7],[19]	0.0	[1],[20]	0.0	[8],[21]
Generation And Marketing [Member]
Disaggregation of Revenue
Revenues		331.4		659.6		658.4		1,278.9
Generation And Marketing [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		13.2		5.2		13.3		15.0
Generation And Marketing [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Generation And Marketing [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Generation And Marketing [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Generation And Marketing [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0	[1]	0.0
Generation And Marketing [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Generation And Marketing [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		460.4		529.5		927.8		981.0
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		19.6		83.0		52.0		123.3
Generation And Marketing [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[2]	0.0	[3]	0.0	[4]	0.0	[5]
Generation And Marketing [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		33.1	[6]	38.2	[7]	54.4	[1]	60.6	[8]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		407.7	[6]	408.3	[7]	821.4	[9]	797.1	[10]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6.2	[11]	1.6	[12]	6.8	[13]	10.2	[14]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		466.6		531.1		934.6		991.2
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(135.2)		128.5		(276.2)		287.7
Generation And Marketing [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[6],[15]	0.0	[7],[16]	0.0	[1],[17]	0.0	[8],[18]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(135.2)	[6],[42]	128.5	[7],[19]	(276.2)	[1],[20]	287.7	[8],[21]
Generation And Marketing [Member] | Retail, Trading and Marketing | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers						10.0		11.0
Other Segments [Member]
Disaggregation of Revenue
Revenues	[43]	32.0		24.5		62.1		44.4
Other Segments [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers	[43]	25.8		10.1		53.6		19.3
Other Segments [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Other Segments [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Other Segments [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Other Segments [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0	[1]	0.0
Other Segments [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Other Segments [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.2		1.3		0.9		4.5
Other Segments [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Other Segments [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[2]	0.0	[3]	0.0	[4]	0.0	[5]
Other Segments [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[6]	0.0	[7]	0.0	[1]	0.0	[8]
Other Segments [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.2	[6]	1.3	[7]	0.9	[9]	4.5	[10]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		28.6	[11]	20.9	[12]	58.0	[13]	34.8	[14]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		29.8		22.2		58.9		39.3
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.2		2.3		3.2		5.1
Other Segments [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[6],[15]	0.0	[7],[16]	0.0	[1],[17]	0.0	[8],[18]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers	[43]	6.2		14.4		8.5		25.1
Revenues		2.2	[6]	$ 2.3	[7],[19]	3.2	[1],[20]	5.1	[8],[21]
Corporate and Other | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 26.0
Corporate and Other | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers						$ 55.0		$ 19.0

[1] Amounts include affiliated and nonaffiliated revenues.

[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $360 million. The remaining affiliated amounts were immaterial.

[3] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $334 million. The remaining affiliated amounts were immaterial.

[4] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $712 million. The affiliated revenue for Vertically Integrated Utilities was $80 million. The remaining affiliated amounts were immaterial.

[5] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $661 million. The remaining affiliated amounts were immaterial.

[6] Amounts include affiliated and nonaffiliated revenues.

[7] Amounts include affiliated and nonaffiliated revenues

[8] Amounts include affiliated and nonaffiliated revenues.

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

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

[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $26 million. The remaining affiliated amounts were immaterial.

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Vertically Integrated Utilities was $5 million. The remaining affiliated amounts were immaterial.

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $55 million. The remaining affiliated amounts were immaterial.

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $19 million. The remaining affiliated amounts were immaterial.

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

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

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

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

[19] Generation & Marketing includes economic hedge activity.

[20] Generation & Marketing includes economic hedge activity.

[21] Generation & Marketing includes economic hedge activity.

[22] Amounts include affiliated and nonaffiliated revenues.

[23] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $38 million primarily related to the PPA with KGPCo.

[24] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $42 million primarily related to the PPA with KGPCo.

[25] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $85 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[26] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $78 million primarily relating to the PPA with KGPCo.

[27] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $357 million. The remaining affiliated amounts were immaterial.

[28] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $330 million. The remaining affiliated amounts were immaterial.

[29] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $706 million. The remaining affiliated amounts were immaterial.

[30] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $653 million. The remaining affiliated amounts were immaterial.

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

[32] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $19 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[33] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $35 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

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

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

[36] Amounts include affiliated and nonaffiliated revenues.

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

[38] Amounts include affiliated and nonaffiliated revenues.

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

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

[41] Amounts include affiliated and nonaffiliated revenues.

[42] Generation & Marketing includes economic hedge activity.

[43] 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.