Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2021		Jun. 30, 2020		Jun. 30, 2021		Jun. 30, 2020		Dec. 31, 2020
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 3,826.5		$ 3,494.0		$ 8,107.6		$ 7,241.5
Revenues		3,826.5		3,494.0		8,107.6		7,241.5
Revenue, Performance Obligation
Fixed Performance Obligations		1,138.5				1,138.5
Revenue Textuals
Revenue from Related Parties		0.0		0.0		0.0		0.0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,849.9		2,677.7		5,786.8		5,547.9
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,320.9		1,315.2		2,915.1		2,751.6
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		821.9		730.8		1,547.3		1,497.1
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		655.2		584.5		1,224.7		1,200.3
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		51.9		47.2		99.7		98.9
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		855.2		798.9		2,089.8		1,564.1
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		201.8		180.1		594.9		364.6
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		289.2	[1]	300.9	[2]	569.8	[3]	541.7	[4]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		19.8	[5]	17.4	[6]	41.5	[7]	34.0	[8]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		344.4	[9]	300.5	[10]	883.6	[11]	623.8	[12]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		79.6	[5]	82.6	[6]	167.5	[7]	154.1	[8]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,784.7		3,559.2		8,044.1		7,266.1
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		41.8		(65.2)		63.5		(24.6)
Alternative [Member]
Disaggregation of Revenue
Revenues		12.7	[5]	(64.1)	[6]	29.6	[7]	(43.4)	[8]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		89.8		72.1		182.4		143.0
Revenues		29.1	[5]	(1.1)	[6]	33.9	[7]	18.8	[8]
2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		618.3				618.3
2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		198.4				198.4
2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		160.4				160.4
After 2025
Revenue, Performance Obligation
Fixed Performance Obligations		161.4				161.4
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		398.5		401.5		762.7		825.1
Revenue, Performance Obligation
Fixed Performance Obligations		254.5				254.5
Affiliated Companies - Contracts with Customers		6.9				6.9				$ 5.1
Revenue Textuals
Revenue from Related Parties		1.0		16.9		2.0		48.0
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		261.7		282.3		498.4		571.6
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		128.5		149.6		251.2		282.5
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		95.4		94.4		176.1		207.2
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		29.7		31.3		56.2		66.5
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.1		7.0		14.9		15.4
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		121.0		91.7		233.0		188.6
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[13]	0.0	[14]	0.0	[15]	0.0	[16]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		121.0	[17]	91.7	[18]	233.0	[19]	188.6	[20]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		12.4	[21]	10.3	[22]	28.6	[23]	18.2	[24]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		395.1		384.3		760.0		778.4
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		3.4		17.2		2.7		46.7
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		3.4	[25]	1.1	[26]	2.7	[27]	0.4	[28]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.9		1.1		2.4		2.0
Revenues		0.0	[25]	16.1	[26]	0.0	[27]	46.3	[28]
AEP Texas Inc. [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		254.5				254.5
AEP Texas Inc. [Member] | 2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Texas Inc. [Member] | 2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Texas Inc. [Member] | After 2025
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Transmission Co [Member]
Disaggregation of Revenue
Revenues		365.5		238.1		727.2		533.7
Revenue, Performance Obligation
Fixed Performance Obligations		663.3				663.3
Affiliated Companies - Contracts with Customers		96.6				96.6				81.2
Revenue Textuals
Revenue from Related Parties		281.4		177.7		567.0		411.4
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		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		339.9		298.7		685.1		596.9
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[13]	0.0	[14]	0.0	[15]	0.0	[16]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		339.9	[17]	298.7	[18]	685.1	[19]	596.9	[20]
Revenue Textuals
Revenue from Related Parties		272.0		237.0		542.0		472.0
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.9	[21]	11.1	[22]	7.5	[23]	14.5	[24]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		342.8		309.8		692.6		611.4
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		22.7		(71.7)		34.6		(77.7)
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		22.7	[25]	(71.7)	[26]	34.6	[27]	(77.7)	[28]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.1		0.6
Revenues		0.0	[25]	0.0	[26]	0.0	[27]	0.0	[28]
AEP Transmission Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		93.9				93.9				81.0
AEP Transmission Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		663.3				663.3
AEP Transmission Co [Member] | 2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Transmission Co [Member] | 2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
AEP Transmission Co [Member] | After 2025
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Appalachian Power Co [Member]
Disaggregation of Revenue
Revenues		677.0		637.5		1,494.0		1,386.9
Revenue, Performance Obligation
Fixed Performance Obligations		161.5				161.5
Affiliated Companies - Contracts with Customers		63.8				63.8				64.3
Revenue Textuals
Revenue from Related Parties		38.1		30.8		88.2		80.5
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		564.3		542.5		1,259.2		1,191.3
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		268.0		272.7		684.9		630.2
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		132.4		119.9		262.6		252.2
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		147.7		134.5		278.6		275.6
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		16.2		15.4		33.1		33.3
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		99.8		91.2		206.4		175.7
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		75.1	[13]	60.9	[14]	147.5	[15]	115.0	[16]
Revenue Textuals
Revenue from Related Parties		28.0		24.0		60.0		57.0
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		24.7	[17]	30.3	[18]	58.9	[19]	60.7	[20]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.0	[21]	13.5	[22]	21.1	[23]	30.7	[24]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		672.1		647.2		1,486.7		1,397.7
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		4.9		(9.7)		7.3		(10.8)
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		5.1	[25]	(9.7)	[26]	7.3	[27]	(10.8)	[28]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.4		2.7		5.1		5.4
Revenues		(0.2)	[25]	0.0	[26]	0.0	[27]	0.0	[28]
Appalachian Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		48.5				48.5				52.7
Appalachian Power Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		89.8				89.8
Appalachian Power Co [Member] | 2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		34.6				34.6
Appalachian Power Co [Member] | 2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		25.5				25.5
Appalachian Power Co [Member] | After 2025
Revenue, Performance Obligation
Fixed Performance Obligations		11.6				11.6
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenues		583.8		546.6		1,148.3		1,116.9
Revenue, Performance Obligation
Fixed Performance Obligations		44.8				44.8
Affiliated Companies - Contracts with Customers		43.5				43.5				51.3
Revenue Textuals
Revenue from Related Parties		0.7		4.9		1.5		7.8
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		451.0		437.2		908.0		900.3
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		179.1		186.9		392.7		388.2
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		127.0		118.0		240.6		240.2
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		143.7		130.7		272.1		268.5
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.2		1.6		2.6		3.4
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		96.6		82.9		184.5		168.7
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		88.3	[13]	75.6	[14]	167.9	[15]	154.0	[16]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.3	[17]	7.3	[18]	16.6	[19]	14.7	[20]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		37.0	[21]	21.9	[22]	57.7	[23]	42.9	[24]
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		584.6		542.0		1,150.2		1,111.9
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.8)		4.6		(1.9)		5.0
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.8)	[25]	4.6	[26]	(1.9)	[27]	5.0	[28]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.7		1.0		3.4		2.5
Revenues		0.0	[25]	0.0	[26]	0.0	[27]	0.0	[28]
Revenue Textuals
Revenue from Related Parties		13.0		18.0		29.0		34.0
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		28.8				28.8				34.8
Indiana Michigan Power Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		20.0				20.0
Indiana Michigan Power Co [Member] | 2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		11.5				11.5
Indiana Michigan Power Co [Member] | 2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8				8.8
Indiana Michigan Power Co [Member] | After 2025
Revenue, Performance Obligation
Fixed Performance Obligations		4.5				4.5
Ohio Power Co [Member]
Disaggregation of Revenue
Revenues		704.9		640.4		1,428.8		1,330.7
Revenue, Performance Obligation
Fixed Performance Obligations		54.7				54.7
Affiliated Companies - Contracts with Customers		74.7				74.7				65.1
Revenue Textuals
Revenue from Related Parties		12.8		16.3		17.6		24.7
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		632.7		577.5		1,278.9		1,196.0
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		366.8		344.8		792.1		733.2
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		189.6		162.1		348.1		326.1
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		73.2		67.3		132.4		130.0
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.1		3.3		6.3		6.7
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		18.6		16.8		37.1		33.9
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[13]	0.0	[14]	0.0	[15]	0.0	[16]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		18.6	[17]	16.8	[18]	37.1	[19]	33.9	[20]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		30.5	[21]	22.7	[22]	66.5	[23]	51.3	[24]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		681.8		617.0		1,382.5		1,281.2
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		23.1		23.4		46.3		49.5
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		19.1	[25]	19.6	[26]	37.0	[27]	39.6	[28]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.0		2.3		4.4		5.0
Revenues		4.0	[25]	3.8	[26]	9.3	[27]	9.9	[28]
Ohio Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		45.7				45.7				45.9
Ohio Power Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		44.5				44.5
Ohio Power Co [Member] | 2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		10.1				10.1
Ohio Power Co [Member] | 2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Ohio Power Co [Member] | After 2025
Revenue, Performance Obligation
Fixed Performance Obligations		0.1				0.1
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenues		344.5		308.6		640.6		605.9
Revenue, Performance Obligation
Fixed Performance Obligations		7.0				7.0
Affiliated Companies - Contracts with Customers		31.9				31.9				15.6
Revenue Textuals
Revenue from Related Parties		1.1		1.3		2.1		2.4
Payments to Acquire Property, Plant, and Equipment						122.8		0.0
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		323.7		287.2		605.3		569.7
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		142.8		139.2		279.6		267.7
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		93.2		77.3		165.9		153.4
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		68.6		54.5		125.0		115.8
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		19.1		16.2		34.8		32.8
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		15.5		6.1		17.8		15.8
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6.7	[13]	2.2	[14]	(0.4)	[15]	4.1	[16]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.8	[17]	3.9	[18]	18.2	[19]	11.7	[20]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.9	[21]	13.7	[22]	16.5	[23]	18.4	[24]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		343.1		307.0		639.6		603.9
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		1.4		1.6		1.0		2.0
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		1.4	[25]	1.6	[26]	1.0	[27]	2.0	[28]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.9		6.2		2.4		7.0
Revenues		0.0	[25]	0.0	[26]	0.0	[27]	0.0	[28]
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		13.0				13.0				7.8
Public Service Co Of Oklahoma [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		7.0				7.0
Public Service Co Of Oklahoma [Member] | 2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Public Service Co Of Oklahoma [Member] | 2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Public Service Co Of Oklahoma [Member] | After 2025
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Southwestern Electric Power Co [Member]
Disaggregation of Revenue
Revenues		430.1		415.0		1,046.2		800.9
Revenue, Performance Obligation
Fixed Performance Obligations		20.1				20.1
Affiliated Companies - Contracts with Customers		30.1				30.1				25.1
Revenue Textuals
Revenue from Related Parties		10.9		13.1		18.7		20.6
Payments to Acquire Property, Plant, and Equipment						147.1		0.0
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		370.7		342.9		722.8		661.9
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		149.9		147.7		316.2		279.3
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		127.1		110.6		240.0		216.2
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		91.1		82.3		161.7		162.1
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.6		2.3		4.9		4.3
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		49.0		63.7		306.5		123.2
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		20.5	[13]	30.3	[14]	249.1	[15]	64.4	[16]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		28.5	[17]	33.4	[18]	57.4	[19]	58.8	[20]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.2	[21]	9.7	[22]	11.6	[23]	15.5	[24]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		424.9		416.3		1,040.9		800.6
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		5.2		(1.3)		5.3		0.3
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		5.2	[25]	(1.3)	[26]	5.3	[27]	0.3	[28]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.4		0.9		1.0		1.7
Revenues		0.0	[25]	0.0	[26]	0.0	[27]	0.0	[28]
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		21.6				21.6				$ 11.2
Southwestern Electric Power Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		20.1				20.1
Southwestern Electric Power Co [Member] | 2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Southwestern Electric Power Co [Member] | 2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		0.0				0.0
Southwestern Electric Power Co [Member] | After 2025
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		(367.8)		(278.6)		(736.2)		(633.4)
Revenue Textuals
Revenue from Related Parties		(367.8)		(278.6)		(736.2)		(633.4)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.2)		(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		(0.2)		(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		(298.8)		(228.6)		(630.6)		(521.6)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(284.8)	[1]	(201.8)	[2]	(584.1)	[3]	(464.8)	[4]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.4)	[5]	(0.3)	[6]	(1.1)	[7]	(0.9)	[8]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(13.6)	[9]	(26.5)	[10]	(45.4)	[11]	(55.9)	[12]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(26.6)	[5]	(31.4)	[6]	(47.8)	[7]	(72.0)	[8]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(325.6)		(260.2)		(678.8)		(594.0)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(42.2)		(18.4)		(57.4)		(39.4)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(40.2)	[5]	(7.6)	[6]	(51.8)	[7]	(3.1)	[8]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(2.0)	[5]	(10.8)	[6]	(5.6)	[7]	(36.3)	[8]
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
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers						0.0		0.0
North Central Wind Energy Facilities
Revenue Textuals
Payments to Acquire Property, Plant, and Equipment						(270.0)		0.0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		2,260.6		2,092.0		4,797.9		4,318.7
Revenue Textuals
Revenue from Related Parties		36.0		29.7		68.8		63.4
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,955.8		1,818.1		4,009.9		3,780.7
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		825.8		820.7		1,871.9		1,735.8
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		536.9		474.5		1,023.1		963.9
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		552.5		486.0		1,036.5		1,004.2
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		40.6		36.9		78.4		76.8
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		249.2		232.7		690.8		453.0
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		170.7		148.6		523.3		289.0
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		78.5	[1]	84.1	[2]	167.5	[3]	164.0	[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		44.4	[5]	46.4	[6]	86.7	[7]	90.0	[8]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,249.4		2,097.2		4,787.4		4,323.7
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		11.2		(5.2)		10.5		(5.0)
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		10.9	[5]	(5.2)	[6]	10.2	[7]	(5.0)	[8]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.3	[5]	0.0	[6]	0.3	[7]	0.0	[8]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,103.4		1,034.5		2,191.5		2,141.4
Revenue Textuals
Revenue from Related Parties		13.8		25.1		19.6		56.8
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		894.3		859.8		1,777.3		1,767.6
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		495.1		494.5		1,043.2		1,015.8
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		285.0		256.3		524.2		533.2
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		102.9		98.7		188.6		196.5
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		11.3		10.3		21.3		22.1
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		139.6		108.4		270.1		222.5
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		139.6	[1]	108.4	[2]	270.1	[3]	222.5	[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		43.0	[5]	33.1	[6]	95.1	[7]	69.5	[8]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,076.9		1,001.3		2,142.5		2,059.6
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		26.5		33.2		49.0		81.8
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		22.5	[5]	20.6	[6]	39.7	[7]	39.9	[8]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		4.0	[5]	12.6	[6]	9.3	[7]	41.9	[8]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		378.2		249.7		755.2		559.9
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		355.9		310.2		716.3		620.0
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		355.9	[1]	310.2	[2]	716.3	[3]	620.0	[4]
Revenue Textuals
Revenue from Related Parties		276.0		240.0		549.0		479.0
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		2.8	[5]	11.4	[6]	7.4	[7]	15.1	[8]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		358.7		321.6		723.7		635.1
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		19.5		(71.9)		31.5		(75.2)
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		19.5	[5]	(71.9)	[6]	31.5	[7]	(75.2)	[8]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Generation And Marketing [Member]
Disaggregation of Revenue
Revenues		436.6		376.9		1,070.8		815.5
Revenue Textuals
Revenue from Related Parties		14.1		26.7		46.6		56.9
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		410.0		376.8		1,042.7		796.8
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		31.1		31.5		71.6		75.6
Revenue Textuals
Revenue from Related Parties		13.0		27.0		45.0		62.0
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		20.2	[5]	17.7	[6]	42.6	[7]	34.9	[8]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		358.7	[9]	327.6	[10]	928.5	[11]	686.3	[12]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.0	[5]	0.7	[6]	3.5	[7]	1.0	[8]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		412.0		377.5		1,046.2		797.8
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		24.6		(0.6)		24.6		17.7
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		24.6	[5]	(0.6)	[6]	24.6	[7]	17.7	[8]
Other Segments [Member]
Disaggregation of Revenue
Revenues	[29]	15.5		19.5		28.4		39.4
Revenue Textuals
Revenue from Related Parties	[29]	12.1		16.6		20.3		38.7
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		(0.7)		(0.6)		0.5		(6.6)
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		(0.7)	[9]	(0.6)	[10]	0.5	[11]	(6.6)	[12]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		14.0	[5]	22.4	[6]	22.6	[7]	50.5	[8]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		13.3		21.8		23.1		43.9
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.2		(2.3)		5.3		(4.5)
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	[29]	3.4		2.9		8.1		0.7
Revenues		$ 2.2	[5]	$ (2.3)	[6]	$ 5.3	[7]	$ (4.5)	[8]

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

[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $240 million. The remaining affiliated amounts were immaterial

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

[4] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $479 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 Generation & Marketing was $13 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $27 million. The remaining affiliated amounts were immaterial.

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

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $62 million. The remaining affiliated amounts were immaterial.

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

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $24 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[15] 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.

[16] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $57 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

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

[18] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $237 million. The remaining affiliated amounts were immaterial.

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

[20] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $472 million. The remaining affiliated amounts were immaterial.

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

[22] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $18 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[23] 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.

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

[25] Amounts include affiliated and nonaffiliated revenues.

[26] Amounts include affiliated and nonaffiliated revenues.

[27] Amounts include affiliated and nonaffiliated revenues.

[28] Amounts include affiliated and nonaffiliated revenues.

[29] 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.