Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021		Dec. 31, 2021
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 4,639.7		$ 3,826.5		$ 9,232.3		$ 8,107.6
Revenues		4,639.7		3,826.5		9,232.3		8,107.6
Revenue, Performance Obligation
Fixed Performance Obligations		1,059.0				1,059.0
Revenue Textuals
Revenue from Related Parties		0.0		0.0		0.0		0.0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,367.4		2,849.9		6,736.3		5,786.8
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,540.9		1,320.9		3,292.3		2,915.1
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		956.5		821.9		1,819.1		1,547.3
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		804.3		655.2		1,500.2		1,224.7
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		65.7		51.9		124.7		99.7
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,077.3		855.2		2,022.3		2,089.8
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		271.4		201.8		498.9		594.9
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		363.3	[1]	289.2	[2]	676.2	[3]	569.8	[4]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		35.3	[5]	19.8	[6]	56.9	[7]	41.5	[8]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		407.3	[9]	344.4	[10]	790.3	[11]	883.6	[12]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		116.7	[13]	79.6	[6]	235.8	[14]	167.5	[8]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4,561.4		3,784.7		8,994.4		8,044.1
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		78.3		41.8		237.9		63.5
Alternative [Member]
Disaggregation of Revenue
Revenues		(57.4)	[5]	12.7	[6]	(63.2)	[7]	29.6	[8]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		93.5		89.8		187.6		182.4
Revenues		135.7	[5]	29.1	[6],[15]	301.1	[7],[16]	33.9	[8],[17]
2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		628.5				628.5
2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		175.8				175.8
2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		157.8				157.8
After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		96.9				96.9
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		478.8		398.5		895.5		762.7
Revenue, Performance Obligation
Fixed Performance Obligations		280.2				280.2
Affiliated Companies - Contracts with Customers		9.8				9.8				$ 7.9
Revenue Textuals
Revenue from Related Parties		0.8		1.0		1.7		2.0
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		331.6		261.7		607.2		498.4
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		174.9		128.5		316.8		251.2
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		110.6		95.4		205.5		176.1
Revenues								762.7
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		36.6		29.7		67.2		56.2
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.5		8.1		17.7		14.9
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		143.8		121.0		276.9		233.0
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[18]	0.0	[19]	0.0	[20]	0.0	[21]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		143.8	[9]	121.0	[22]	276.9	[23]	233.0	[24]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.6	[25]	12.4	[26]	14.9	[27]	28.6	[28]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		481.0		395.1		899.0		760.0
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2.2)		3.4		(3.5)		2.7
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.2)	[29]	3.4	[30]	(3.5)	[31]	2.7	[32]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.1		0.9		2.2		2.4
Revenues		0.0	[29]	0.0	[30]	0.0	[31]	0.0	[32]
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		0.1				0.1				0.4
AEP Texas Inc. [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		280.2				280.2
AEP Texas Inc. [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Texas Inc. [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Texas Inc. [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Transmission Co [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers								0.1
Revenues		364.4		365.5		764.8		727.2
Revenue, Performance Obligation
Fixed Performance Obligations		738.8				738.8
Affiliated Companies - Contracts with Customers		111.1				111.1				96.1
Revenue Textuals
Revenue from Related Parties		333.9		299.0		658.9		584.6
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
Revenues								727.2
AEP Transmission Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		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		406.1		339.9		806.4		685.1
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[18]	0.0	[19]	0.0	[20]	0.0	[21]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		406.1	[9]	339.9	[22]	806.4	[23]	685.1	[24]
Revenue Textuals
Revenue from Related Parties		330.0		272.0		653.0		542.0
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.2	[25]	2.9	[26]	(0.1)	[27]	7.5	[28]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		406.3		342.8		806.3		692.6
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(41.9)		22.7		(41.5)		34.6
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(41.9)	[29]	22.7	[30]	(41.5)	[31]	34.6	[32]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.1
Revenues		0.0	[29]	0.0	[30]	0.0	[31]	0.0	[32]
AEP Transmission Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		111.4				111.4				95.5
AEP Transmission Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		738.8				738.8
AEP Transmission Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Transmission Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Transmission Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Appalachian Power Co [Member]
Disaggregation of Revenue
Revenues		773.6		677.0		1,680.9		1,494.0
Revenue, Performance Obligation
Fixed Performance Obligations		171.0				171.0
Affiliated Companies - Contracts with Customers		72.1				72.1				129.9
Revenue Textuals
Revenue from Related Parties		63.1		38.1		120.0		88.2
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		647.9		564.3		1,434.2		1,259.2
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		313.2		268.0		771.2		684.9
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		152.6		132.4		306.5		262.6
Revenues								1,494.0
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		161.9		147.7		315.7		278.6
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		20.2		16.2		40.8		33.1
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		104.3		99.8		201.6		206.4
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		63.5	[18]	75.1	[19]	119.7	[20]	147.5	[21]
Revenue Textuals
Revenue from Related Parties		42.0		28.0		78.0		60.0
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		40.8	[9]	24.7	[22]	81.9	[23]	58.9	[24]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		20.6	[25]	8.0	[26]	44.9	[27]	21.1	[28]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		772.8		672.1		1,680.7		1,486.7
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0.8		4.9		0.2		7.3
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.8	[29]	5.1	[30]	0.1	[31]	7.3	[32]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.6		2.4		8.9		5.1
Revenues		0.0	[29]	(0.2)	[30]	0.1	[31]	0.0	[32]
Appalachian Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		62.5				62.5				117.8
Appalachian Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		100.2				100.2
Appalachian Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		33.8				33.8
Appalachian Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		25.5				25.5
Appalachian Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		11.5				11.5
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenues		631.0		583.8		1,256.2		1,148.3
Revenue, Performance Obligation
Fixed Performance Obligations		43.1				43.1
Affiliated Companies - Contracts with Customers		50.0				50.0				78.2
Revenue Textuals
Revenue from Related Parties		7.1		0.7		9.1		1.5
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		495.0		451.0		991.2		908.0
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		195.2		179.1		427.0		392.7
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		138.6		127.0		265.2		240.6
Revenues								1,148.3
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		160.0		143.7		296.5		272.1
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.2		1.2		2.5		2.6
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		102.9		96.6		202.1		184.5
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		94.2	[18]	88.3	[19]	184.6	[20]	167.9	[21]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.7	[9]	8.3	[22]	17.5	[23]	16.6	[24]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		25.8	[25]	37.0	[26]	55.7	[27]	57.7	[28]
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		623.7		584.6		1,249.0		1,150.2
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		7.3		(0.8)		7.2		(1.9)
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		7.3	[29]	(0.8)	[30]	7.3	[31]	(1.9)	[32]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.8		1.7		5.6		3.4
Revenues		0.0	[29]	0.0	[30]	(0.1)	[31]	0.0	[32]
Revenue Textuals
Revenue from Related Parties		19.0		13.0		29.0		29.0
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		37.0				37.0				61.2
Indiana Michigan Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		18.7				18.7
Indiana Michigan Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		11.1				11.1
Indiana Michigan Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8				8.8
Indiana Michigan Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		4.5				4.5
Ohio Power Co [Member]
Disaggregation of Revenue
Revenues		822.9		704.9		1,652.9		1,428.8
Revenue, Performance Obligation
Fixed Performance Obligations		41.8				41.8
Affiliated Companies - Contracts with Customers		74.0				74.0				71.8
Revenue Textuals
Revenue from Related Parties		3.9		12.8		7.6		17.6
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		737.2		632.7		1,496.6		1,278.9
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		386.7		366.8		845.4		792.1
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		221.1		189.6		415.8		348.1
Revenues								1,428.8
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		126.0		73.2		228.7		132.4
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.4		3.1		6.7		6.3
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.1		18.6		42.9		37.1
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[18]	0.0	[19]	0.0	[20]	0.0	[21]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.1	[9]	18.6	[22]	42.9	[23]	37.1	[24]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		60.2	[25]	30.5	[26]	104.8	[27]	66.5	[28]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		818.5		681.8		1,644.3		1,382.5
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		4.4		23.1		8.6		46.3
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.4)	[29]	19.1	[30]	(4.5)	[31]	37.0	[32]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.8		2.0		3.9		4.4
Revenues		6.8	[29]	4.0	[30]	13.1	[31]	9.3	[32]
Ohio Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		50.2				50.2				51.7
Ohio Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		38.4				38.4
Ohio Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		3.4				3.4
Ohio Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Ohio Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenues		442.9		344.5		830.5		640.6
Revenue, Performance Obligation
Fixed Performance Obligations		6.4				6.4
Affiliated Companies - Contracts with Customers		62.1				62.1				35.0
Revenue Textuals
Revenue from Related Parties		0.8		1.1		1.4		2.1
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		424.7		323.7		787.9		605.3
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		185.2		142.8		351.1		279.6
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		121.2		93.2		218.7		165.9
Revenues								640.6
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		92.5		68.6		171.1		125.0
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		25.8		19.1		47.0		34.8
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.4		15.5		28.5		17.8
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.3	[18]	6.7	[19]	9.8	[20]	(0.4)	[21]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.1	[9]	8.8	[22]	18.7	[23]	18.2	[24]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.6	[25]	3.9	[26]	15.0	[27]	16.5	[28]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		443.7		343.1		831.4		639.6
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.8)		1.4		(0.9)		1.0
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.8)	[29]	1.4	[30]	(0.9)	[31]	1.0	[32]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.1		0.9		2.7		2.4
Revenues		0.0	[29]	0.0	[30]	0.0	[31]	0.0	[32]
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		31.8				31.8				18.8
Public Service Co Of Oklahoma [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		6.4				6.4
Public Service Co Of Oklahoma [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Public Service Co Of Oklahoma [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Public Service Co Of Oklahoma [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Southwestern Electric Power Co [Member]
Disaggregation of Revenue
Revenues		536.6		430.1		1,031.4		1,046.2
Revenue, Performance Obligation
Fixed Performance Obligations		21.2				21.2
Affiliated Companies - Contracts with Customers		71.9				71.9				38.3
Revenue Textuals
Revenue from Related Parties		15.5		10.9		25.5		18.7
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		436.1		370.7		829.6		722.8
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		188.6		149.9		364.5		316.2
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		146.0		127.1		276.5		240.0
Revenues								1,046.2
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		97.1		91.1		181.8		161.7
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4.4		2.6		6.8		4.9
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		96.7		49.0		193.1		306.5
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		57.4	[18]	20.5	[19]	118.6	[20]	249.1	[21]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		39.3	[9]	28.5	[22]	74.5	[23]	57.4	[24]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6.0	[25]	5.2	[26]	11.3	[27]	11.6	[28]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		538.8		424.9		1,034.0		1,040.9
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2.2)		5.2		(2.6)		5.3
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.2)	[29]	5.2	[30]	(2.6)	[31]	5.3	[32]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.4		0.4		1.0		1.0
Revenues		0.0	[29]	0.0	[30]	0.0	[31]	0.0	[32]
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		38.2				38.2				$ 24.7
Southwestern Electric Power Co [Member] | 2022 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		21.2				21.2
Southwestern Electric Power Co [Member] | 2023-2024 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Southwestern Electric Power Co [Member] | 2025-2026 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Southwestern Electric Power Co [Member] | After 2026
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Consolidation Eliminations [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Revenues		(373.3)		(367.8)		(765.5)		(736.2)
Revenue Textuals
Revenue from Related Parties		(373.3)		(367.8)		(765.5)		(736.2)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		(0.2)		(0.4)		(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		0.0		(0.2)		(0.4)		(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		(337.1)		(298.8)		(708.7)		(630.6)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.1		0.0		0.1		0.0
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(332.0)	[1]	(284.8)	[2]	(693.8)	[3]	(584.1)	[4]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(2.9)	[5]	(0.4)	[6]	(3.7)	[7]	(1.1)	[8]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(2.3)	[9]	(13.6)	[10]	(11.3)	[11]	(45.4)	[12]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(21.1)	[13]	(26.6)	[6]	(39.7)	[14]	(47.8)	[8]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(358.2)		(325.6)		(748.8)		(678.8)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(15.1)		(42.2)		(16.7)		(57.4)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(13.1)	[5]	(40.2)	[6]	(11.8)	[7]	(51.8)	[8]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(2.0)	[5]	(2.0)	[6],[15]	(4.9)	[7],[16]	(5.6)	[8],[17]
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
Revenue Textuals
Revenue from Related Parties		0.0		0.0		0.0		0.0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		2,648.5		2,260.6		5,335.9		4,797.9
Revenue Textuals
Revenue from Related Parties		53.5		36.0		94.1		68.8
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,298.8		1,955.8		4,632.9		4,009.9
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		979.3		825.8		2,130.1		1,871.9
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		624.8		536.9		1,197.7		1,023.1
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		641.8		552.5		1,204.8		1,036.5
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		52.9		40.6		100.3		78.4
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		297.1		249.2		589.6		690.8
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		188.3		170.7		375.5		523.3
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		108.8	[1]	78.5	[2]	214.1	[3]	167.5	[4]
Vertically Integrated Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[9]	0.0	[10]	0.0	[11]	0.0	[12]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		49.2	[13]	44.4	[6]	110.8	[14]	86.7	[8]
Revenue Textuals
Revenue from Related Parties		5.0
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,645.1		2,249.4		5,333.3		4,787.4
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		3.4		11.2		2.6		10.5
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		3.3	[5]	10.9	[6]	2.5	[7]	10.2	[8]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.1	[5]	0.3	[6],[15]	0.1	[7],[16]	0.3	[8],[17]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,301.6		1,103.4		2,548.4		2,191.5
Revenue Textuals
Revenue from Related Parties		4.8		13.8		9.4		19.6
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,068.6		894.3		2,103.8		1,777.3
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		561.6		495.1		1,162.2		1,043.2
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		331.7		285.0		621.4		524.2
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		162.5		102.9		295.8		188.6
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		12.8		11.3		24.4		21.3
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		164.9		139.6		319.8		270.1
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		164.9	[1]	139.6	[2]	319.8	[3]	270.1	[4]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[9]	0.0	[10]	0.0	[11]	0.0	[12]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		65.9	[13]	43.0	[6]	119.7	[14]	95.1	[8]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,299.4		1,076.9		2,543.3		2,142.5
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.2		26.5		5.1		49.0
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(4.6)	[5]	22.5	[6]	(8.0)	[7]	39.7	[8]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		6.8	[5]	4.0	[6],[15]	13.1	[7],[16]	9.3	[8],[17]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		378.8		378.2		790.2		755.2
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		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		421.6		355.9		836.1		716.3
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		421.6	[1]	355.9	[2]	836.1	[3]	716.3	[4]
Revenue Textuals
Revenue from Related Parties		334.0		276.0		661.0		549.0
AEP Transmission Holdco [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[9]	0.0	[10]	0.0	[11]	0.0	[12]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.2	[13]	2.8	[6]	0.0	[14]	7.4	[8]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		421.8		358.7		836.1		723.7
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(43.0)		19.5		(45.9)		31.5
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(43.0)	[5]	19.5	[6]	(45.9)	[7]	31.5	[8]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[5]	0.0	[6],[15]	0.0	[7],[16]	0.0	[8],[17]
Generation And Marketing [Member]
Disaggregation of Revenue
Revenues		659.6		436.6		1,278.9		1,070.8
Revenue Textuals
Revenue from Related Parties		5.2		14.1		15.0		46.6
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		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		529.5		410.0		981.0		1,042.7
Revenue Textuals
Revenue from Related Parties						11.0		45.0
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		83.0		31.1		123.3		71.6
Revenue Textuals
Revenue from Related Parties				13.0
Generation And Marketing [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[1]	0.0	[2]	0.0	[3]	0.0	[4]
Generation And Marketing [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		38.2	[5]	20.2	[6]	60.6	[7]	42.6	[8]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		408.3	[9]	358.7	[10]	797.1	[11]	928.5	[12]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.6	[13]	2.0	[6]	10.2	[14]	3.5	[8]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		531.1		412.0		991.2		1,046.2
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		128.5		24.6		287.7		24.6
Generation And Marketing [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		128.5	[5],[33]	24.6	[6],[15]	287.7	[7],[16]	24.6	[8],[17]
Other Segments [Member]
Disaggregation of Revenue
Revenues	[34]	24.5		15.5		44.4		28.4
Revenue Textuals
Revenue from Related Parties	[34]	10.1		12.1		19.3		20.3
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		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		1.3		(0.7)		4.5		0.5
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	[1]	0.0	[2]	0.0	[3]	0.0	[4]
Other Segments [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Other Segments [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.3	[9]	(0.7)	[10]	4.5	[11]	0.5	[12]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		20.9	[13]	14.0	[6]	34.8	[14]	22.6	[8]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		22.2		13.3		39.3		23.1
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.3		2.2		5.1		5.3
Other Segments [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers	[34]	14.4		3.4		25.1		8.1
Revenues		$ 2.3	[5]	$ 2.2	[6],[15]	5.1	[7],[16]	$ 5.3	[8],[17]
Corporate and Other | Other Revenues [Member]
Revenue Textuals
Revenue from Related Parties						$ 19.0

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

[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $276 million. The remaining affiliated amounts were immaterial.

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

[4] (a)Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $549 million. The remaining affiliated amounts were immaterial.

[5] Amounts include affiliated and nonaffiliated revenues.

[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 AEPTCo was $330 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $13 million. The remaining affiliated amounts were immaterial.

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

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $45 million. The remaining affiliated amounts were immaterial.

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Vertically Integrated Utilities was $5 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] Generation & Marketing includes economic hedge activity.

[16] Generation & Marketing includes economic hedge activity.

[17] Generation & Marketing includes economic hedge activity.

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

[19] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $28 million primarily related to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

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

[21] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $60 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[22] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $272 million. The remaining affiliated amounts were immaterial.

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

[24] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $542 million. The remaining affiliated amounts were immaterial.

[25] 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.

[26] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $13 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

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

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

[29] Amounts include affiliated and nonaffiliated revenues.

[30] Amounts include affiliated and nonaffiliated revenues.

[31] Amounts include affiliated and nonaffiliated revenues.

[32] Amounts include affiliated and nonaffiliated revenues.

[33] Generation & Marketing includes economic hedge activity.

[34] Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income, interest expense and other nonallocated costs.