Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021		Sep. 30, 2020		Dec. 31, 2020
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 4,623.0		$ 4,066.4		$ 12,730.6		$ 11,307.9
Revenues		4,623.0		4,066.4		12,730.6		11,307.9
Revenue, Performance Obligation
Fixed Performance Obligations		836.0				836.0
Revenue Textuals
Revenue from Related Parties		0.0		0.0		0.0		0.0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,360.8		3,116.7		9,147.6		8,664.6
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,742.3		1,648.1		4,657.4		4,399.7
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		898.8		818.9		2,446.1		2,316.0
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		661.1		598.3		1,885.8		1,798.6
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		58.6		51.4		158.3		150.3
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,008.0		872.3		3,097.8		2,436.4
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		281.6		188.9		876.5		553.5
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		308.8	[1]	244.3	[2]	878.6	[3]	786.0	[4]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		23.5	[5]	15.5	[6]	65.0	[7]	49.5	[8]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		394.1	[9]	423.6	[10]	1,277.7	[11]	1,047.4	[12]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		93.5	[5]	70.2	[6]	261.0	[7]	224.3	[8]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4,462.3		4,059.2		12,506.4		11,325.3
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		160.7		7.2		224.2		(17.4)
Alternative [Member]
Disaggregation of Revenue
Revenues		5.9	[5]	12.7	[6]	35.5	[7]	(30.7)	[8]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		93.8		77.4		276.2		220.4
Revenues		154.8	[5]	(5.5)	[6]	188.7	[7]	13.3	[8]
2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		314.9				314.9
2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		199.3				199.3
2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		160.3				160.3
After 2025
Revenue, Performance Obligation
Fixed Performance Obligations		161.5				161.5
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		432.6		432.0		1,195.3		1,257.1
Revenue, Performance Obligation
Fixed Performance Obligations		132.7				132.7
Affiliated Companies - Contracts with Customers		4.8				4.8				$ 5.1
Revenue Textuals
Revenue from Related Parties		0.9		41.4		2.9		89.4
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		295.2		275.1		793.6		846.7
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		172.5		165.3		423.7		447.8
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		89.1		78.0		265.2		285.2
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		25.4		24.9		81.6		91.4
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.2		6.9		23.1		22.3
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		131.5		101.8		364.5		290.4
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		131.5	[17]	101.8	[18]	364.5	[19]	290.4	[20]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6.8	[21]	15.2	[22]	35.4	[23]	33.4	[24]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		433.5		392.1		1,193.5		1,170.5
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.9)		39.9		1.8		86.6
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.9)	[25]	(0.7)	[26]	1.8	[27]	(0.3)	[28]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.9		0.5		3.3		2.5
Revenues		0.0	[25]	40.6	[26]	0.0	[27]	86.9	[28]
AEP Texas Inc. [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		132.7				132.7
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		377.0		304.1		1,104.2		837.8
Revenue, Performance Obligation
Fixed Performance Obligations		331.7				331.7
Affiliated Companies - Contracts with Customers		96.7				96.7				81.2
Revenue Textuals
Revenue from Related Parties		297.6		241.2		864.6		652.6
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
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		360.1		305.7		1,045.2		902.6
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		360.1	[17]	305.7	[18]	1,045.2	[19]	902.6	[20]
Revenue Textuals
Revenue from Related Parties		281.0		243.0		823.0		715.0
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.0	[21]	3.0	[22]	12.5	[23]	17.5	[24]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		365.1		308.7		1,057.7		920.1
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		11.9		(4.6)		46.5		(82.3)
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		11.9	[25]	(4.6)	[26]	46.5	[27]	(82.3)	[28]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.2		0.0		0.3		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		96.4				96.4				81.0
AEP Transmission Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		331.7				331.7
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		804.0		735.7		2,298.0		2,122.6
Revenue, Performance Obligation
Fixed Performance Obligations		117.6				117.6
Affiliated Companies - Contracts with Customers		77.4				77.4				64.3
Revenue Textuals
Revenue from Related Parties		52.4		44.4		140.6		124.9
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		660.4		619.6		1,919.6		1,810.9
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		340.1		324.2		1,025.0		954.4
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		146.9		138.4		409.5		390.6
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		154.8		139.4		433.4		415.0
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		18.6		17.6		51.7		50.9
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		118.9		101.1		325.3		276.8
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		83.7	[13]	70.3	[14]	231.2	[15]	185.3	[16]
Revenue Textuals
Revenue from Related Parties		30.0		28.0		90.0		85.0
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		35.2	[17]	30.8	[18]	94.1	[19]	91.5	[20]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		22.5	[21]	16.1	[22]	43.6	[23]	46.8	[24]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		801.8		736.8		2,288.5		2,134.5
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.2		(1.1)		9.5		(11.9)
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		2.2	[25]	(1.1)	[26]	9.5	[27]	(11.9)	[28]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.1		2.4		8.2		7.8
Revenues		0.0	[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		64.1				64.1				52.7
Appalachian Power Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		44.9				44.9
Appalachian Power Co [Member] | 2022-2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		34.5				34.5
Appalachian Power Co [Member] | 2024-2025 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		26.6				26.6
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		635.7		586.7		1,784.0		1,703.6
Revenue, Performance Obligation
Fixed Performance Obligations		34.8				34.8
Affiliated Companies - Contracts with Customers		37.9				37.9				51.3
Revenue Textuals
Revenue from Related Parties		1.1		1.3		2.6		9.1
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		523.7		499.7		1,431.7		1,400.0
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		231.7		222.6		624.4		610.8
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		143.9		135.8		384.5		376.0
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		146.8		139.7		418.9		408.2
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.3		1.6		3.9		5.0
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		88.9		68.9		273.4		237.6
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		80.2	[13]	61.5	[14]	248.1	[15]	215.5	[16]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.7	[17]	7.4	[18]	25.3	[19]	22.1	[20]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		24.2	[21]	17.7	[22]	81.9	[23]	60.6	[24]
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		636.8		586.3		1,787.0		1,698.2
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(1.1)		0.4		(3.0)		5.4
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(1.1)	[25]	0.4	[26]	(3.0)	[27]	5.4	[28]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.7		1.2		5.1		3.7
Revenues		0.0	[25]	0.0	[26]	0.0	[27]	0.0	[28]
Revenue Textuals
Revenue from Related Parties		17.0		15.0		46.0		49.0
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		24.6				24.6				34.8
Indiana Michigan Power Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		10.0				10.0
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		767.7		741.0		2,196.5		2,071.7
Revenue, Performance Obligation
Fixed Performance Obligations		32.3				32.3
Affiliated Companies - Contracts with Customers		64.7				64.7				65.1
Revenue Textuals
Revenue from Related Parties		4.3		8.3		21.9		33.0
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		689.1		682.8		1,968.0		1,878.8
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		425.4		429.4		1,217.5		1,162.6
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		190.8		181.2		538.9		507.3
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		69.8		69.1		202.2		199.1
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.1		3.1		9.4		9.8
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		19.1		17.2		56.2		51.1
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		19.1	[17]	17.2	[18]	56.2	[19]	51.1	[20]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		47.3	[21]	27.6	[22]	113.8	[23]	78.9	[24]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		755.5		727.6		2,138.0		2,008.8
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		12.2		13.4		58.5		62.9
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		7.3	[25]	10.0	[26]	44.3	[27]	49.6	[28]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.4		2.3		6.8		7.3
Revenues		4.9	[25]	3.4	[26]	14.2	[27]	13.3	[28]
Ohio Power Co [Member] | Short-term Contract with Customer [Member]
Revenue, Performance Obligation
Affiliated Companies - Contracts with Customers		44.5				44.5				45.9
Ohio Power Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		22.2				22.2
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		0.0				0.0
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenues		483.8		382.2		1,124.4		988.1
Revenue, Performance Obligation
Fixed Performance Obligations		3.5				3.5
Affiliated Companies - Contracts with Customers		31.7				31.7				15.6
Revenue Textuals
Revenue from Related Parties		1.0		1.4		3.1		3.8
Payments to Acquire Property, Plant, and Equipment						297.0		0.0
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		458.2		363.6		1,063.5		933.3
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		236.8		195.8		516.4		463.5
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		120.9		94.4		286.8		247.8
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		77.1		55.0		202.1		170.8
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		23.4		18.4		58.2		51.2
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		17.8		14.3		35.6		30.1
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		7.2	[13]	5.8	[14]	6.8	[15]	9.9	[16]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		10.6	[17]	8.5	[18]	28.8	[19]	20.2	[20]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.3	[21]	4.8	[22]	24.8	[23]	23.2	[24]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		484.3		382.7		1,123.9		986.6
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.5)		(0.5)		0.5		1.5
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.5)	[25]	(0.5)	[26]	0.5	[27]	1.5	[28]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.5		1.0		3.9		8.0
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		17.7				17.7				7.8
Public Service Co Of Oklahoma [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		3.5				3.5
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		584.1		517.3		1,630.3		1,318.2
Revenue, Performance Obligation
Fixed Performance Obligations		10.1				10.1
Affiliated Companies - Contracts with Customers		35.6				35.6				25.1
Revenue Textuals
Revenue from Related Parties		13.5		10.9		32.2		31.5
Payments to Acquire Property, Plant, and Equipment						355.8		0.0
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		464.0		440.5		1,186.8		1,102.4
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		230.9		219.4		547.1		498.7
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		145.4		135.0		385.4		351.2
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		85.4		83.8		247.1		245.9
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.3		2.3		7.2		6.6
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		114.2		71.0		420.7		194.2
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		77.1	[13]	42.3	[14]	326.2	[15]	106.7	[16]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		37.1	[17]	28.7	[18]	94.5	[19]	87.5	[20]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6.1	[21]	5.6	[22]	17.7	[23]	21.1	[24]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		584.3		517.1		1,625.2		1,317.7
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.2)		0.2		5.1		0.5
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.2)	[25]	0.2	[26]	5.1	[27]	0.5	[28]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.5		0.7		1.5		2.4
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		19.9				19.9				$ 11.2
Southwestern Electric Power Co [Member] | 2021 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		10.1				10.1
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		(376.0)		(374.2)		(1,112.2)		(1,007.6)
Revenue Textuals
Revenue from Related Parties		(376.0)		(374.2)		(1,112.2)		(1,007.6)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.1)		(0.1)		(0.5)		(0.5)
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)		(0.1)		(0.5)		(0.5)
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		(321.1)		(302.0)		(951.7)		(823.6)
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		(317.4)	[1]	(276.9)	[2]	(901.5)	[3]	(741.7)	[4]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.6)	[5]	(0.3)	[6]	(1.7)	[7]	(1.2)	[8]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(3.1)	[9]	(24.8)	[10]	(48.5)	[11]	(80.7)	[12]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(40.1)	[5]	(43.7)	[6]	(87.9)	[7]	(115.7)	[8]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(361.3)		(345.8)		(1,040.1)		(939.8)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(14.7)		(28.4)		(72.1)		(67.8)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(11.7)	[5]	6.6	[6]	(63.5)	[7]	3.5	[8]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(3.0)	[5]	(35.0)	[6]	(8.6)	[7]	(71.3)	[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		0.0
North Central Wind Energy Facilities
Revenue Textuals
Payments to Acquire Property, Plant, and Equipment						(652.8)		0.0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		2,759.3		2,434.8		7,557.2		6,753.5
Revenue Textuals
Revenue from Related Parties		42.5		34.7		111.3		98.1
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,376.7		2,158.9		6,386.6		5,939.6
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,144.3		1,053.3		3,016.2		2,789.1
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		618.9		559.7		1,642.0		1,523.6
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		566.0		504.5		1,602.5		1,508.7
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		47.5		41.4		125.9		118.2
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		333.6		242.8		1,024.4		695.8
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		233.8		158.4		757.1		447.4
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		99.8	[1]	84.4	[2]	267.3	[3]	248.4	[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		49.4	[5]	34.1	[6]	136.1	[7]	124.1	[8]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,759.7		2,435.8		7,547.1		6,759.5
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.4)		(1.0)		10.1		(6.0)
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.5	[5]	(1.0)	[6]	10.7	[7]	(6.0)	[8]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(0.9)	[5]	0.0	[6]	(0.6)	[7]	0.0	[8]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,200.3		1,165.3		3,391.8		3,306.7
Revenue Textuals
Revenue from Related Parties		5.3		41.2		24.9		98.0
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		984.2		957.9		2,761.5		2,725.5
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		598.0		594.8		1,641.2		1,610.6
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		279.9		259.2		804.1		792.4
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		95.2		93.9		283.8		290.4
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		11.1		10.0		32.4		32.1
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		150.6		119.1		420.7		341.6
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		150.6	[1]	119.1	[2]	420.7	[3]	341.6	[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		54.2	[5]	42.8	[6]	149.3	[7]	112.3	[8]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,189.0		1,119.8		3,331.5		3,179.4
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		11.3		45.5		60.3		127.3
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		6.4	[5]	9.3	[6]	46.1	[7]	49.2	[8]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		4.9	[5]	36.2	[6]	14.2	[7]	78.1	[8]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		391.6		317.9		1,146.8		877.8
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		375.8		317.7		1,092.1		937.7
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		375.8	[1]	317.7	[2]	1,092.1	[3]	937.7	[4]
Revenue Textuals
Revenue from Related Parties		286.0		246.0		835.0		725.0
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		5.1	[5]	2.4	[6]	12.5	[7]	17.5	[8]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		380.9		320.1		1,104.6		955.2
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		10.7		(2.2)		42.2		(77.4)
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		10.7	[5]	(2.2)	[6]	42.2	[7]	(77.4)	[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		621.1		490.0		1,691.9		1,305.5
Revenue Textuals
Revenue from Related Parties		3.7		25.2		50.3		82.1
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		469.0		493.8		1,511.7		1,290.6
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		47.8		30.5		119.4		106.1
Revenue Textuals
Revenue from Related Parties		4.0		19.0		49.0		81.0
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		24.1	[5]	15.8	[6]	66.7	[7]	50.7	[8]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		397.1	[9]	447.5	[10]	1,325.6	[11]	1,133.8	[12]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.4	[5]	0.7	[6]	4.9	[7]	1.7	[8]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		470.4		494.5		1,516.6		1,292.3
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		150.7		(4.5)		175.3		13.2
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		150.7	[5],[29]	(4.5)	[6],[30]	175.3	[7],[31]	13.2	[8],[32]
Other Segments [Member]
Disaggregation of Revenue
Revenues	[33]	26.7		32.6		55.1		72.0
Revenue Textuals
Revenue from Related Parties	[33]	23.2		28.6		43.5		67.3
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		0.1		0.9		0.6		(5.7)
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		0.1	[9]	0.9	[10]	0.6	[11]	(5.7)	[12]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		23.5	[5]	33.9	[6]	46.1	[7]	84.4	[8]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		23.6		34.8		46.7		78.7
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		3.1		(2.2)		8.4		(6.7)
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	[33]	3.5		4.0		11.6		4.7
Revenues		$ 3.1	[5]	$ (2.2)	[6]	$ 8.4	[7]	$ (6.7)	[8]

[1] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $286 million. The remaining affiliated amounts were immaterial.

[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $246 million. The remaining affiliated amounts were immaterial

[3] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $835 million. The remaining affiliated amounts were immaterial.

[4] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $725 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 $4 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $19 million. The remaining affiliated amounts were immaterial.

[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $49 million. The remaining affiliated amounts were immaterial.

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $81 million. The remaining affiliated amounts were immaterial.

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $30 million primarily relating to the PPA with KGPCo.

[14] 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.

[15] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $90 million primarily relating to the PPA with KGPCo.

[16] 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.

[17] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $281 million. The remaining affiliated amounts were immaterial.

[18] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $243 million. The remaining affiliated amounts were immaterial.

[19] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $823 million. The remaining affiliated amounts were immaterial.

[20] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $715 million. The remaining affiliated amounts were immaterial.

[21] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $17 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 $15 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 $46 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 $49 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] Generation & Marketing includes economic hedge activity.

[30] Generation & Marketing includes economic hedge activity.

[31] Generation & Marketing includes economic hedge activity

[32] Generation & Marketing includes economic hedge activity.

[33] 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.