Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 5,341.7		$ 5,526.1		$ 14,405.1		$ 14,758.4
Revenues		5,341.7		5,526.1		14,405.1		14,758.4
Revenue, Performance Obligation
Fixed Performance Obligations		365.0				365.0
Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4,158.3		4,037.0		11,405.9		10,773.3
Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,099.2		2,019.9		5,462.5		5,312.2
Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,141.0		1,098.1		3,151.3		2,917.2
Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		838.5		849.7		2,572.4	[1]	2,349.9	[2]
Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		79.6		69.3		219.7		194.0
Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,035.6		1,224.7		2,953.2		3,247.0
Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		205.8		382.8		582.1		881.7	[2]
Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		337.6	[3]	314.8	[4]	1,015.4	[5]	991.0	[6]
Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		17.3	[7]	41.8	[8]	68.5	[1]	98.7	[2]
Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		474.9	[9]	485.3		1,287.2	[10]	1,275.6	[11]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		132.3	[12]	138.0	[13]	314.8	[14]	373.8	[15]
Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5,326.2		5,399.7		14,673.9		14,394.1
Alternative and Other [Member]
Disaggregation of Revenue
Revenues		15.5		126.4		(268.8)		364.3
Alternative [Member]
Disaggregation of Revenue
Revenues		7.0	[7],[16]	(1.9)	[8],[17]	(18.6)	[1],[18]	(65.1)	[2],[19]
Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		120.9		92.9		307.8		280.5
Revenues		8.5	[7]	128.3	[8],[20]	(250.2)	[1],[21]	429.4	[2],[22]
2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		22.6				22.6
2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		166.2				166.2
2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		141.2				141.2
After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		35.0				35.0
AEP Texas Inc. [Member]
Disaggregation of Revenue
Revenues		554.6		508.9		1,445.3		1,404.4
AEP Texas Inc. [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		1.2		0.9		3.7		2.6
Revenue Textuals
Affiliated Companies - Contracts with Customers		20.1				20.1				$ 11.9
AEP Texas Inc. [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		393.2		358.0		958.2		965.2
AEP Texas Inc. [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		236.2		204.0		511.8		520.8
AEP Texas Inc. [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		112.4		107.1		310.3		312.6
AEP Texas Inc. [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		35.4		35.4		109.9	[23]	102.6	[24]
AEP Texas Inc. [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		9.2		11.5		26.2		29.2
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		154.6		140.8		464.0		417.7
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[25]	0.0	[26]	0.0	[27]	0.0	[28]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		154.6	[29]	140.8	[30]	464.0	[31]	417.7	[32]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		8.8	[33]	9.5	[34]	29.2	[35]	24.4	[36]
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		556.6		508.3		1,451.4		1,407.3
AEP Texas Inc. [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2.0)		0.6		(6.1)		(2.9)
AEP Texas Inc. [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.0)	[37],[38]	0.6	[39],[40]	(6.1)	[23],[41]	(2.9)	[24],[42]
AEP Texas Inc. [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.8		0.3		2.9		2.5
Revenues		0.0	[38]	0.0	[40]	0.0	[23]	0.0	[24]
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		0.1				0.1				0.1
AEP Transmission Co [Member]
Disaggregation of Revenue
Revenues		462.7		418.5		1,349.2		1,183.3
AEP Transmission Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		374.7		340.6		1,097.9		999.5
Revenue Textuals
Affiliated Companies - Contracts with Customers		123.1				123.1				119.5
AEP Transmission Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0	[23]	0.0	[24]
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		454.7		411.7		1,338.1		1,218.1
AEP Transmission Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[25]	0.0	[26]	0.0	[27]	0.0	[28]
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		454.7	[29]	411.7	[30]	1,338.1	[31]	1,218.1	[32]
AEP Transmission Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		363.0		339.0		1,100.0		992.0
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.0	[33]	(0.3)	[34]	12.8	[35]	(0.4)	[36]
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		459.7		411.4		1,350.9		1,217.7
AEP Transmission Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		3.0		7.1		(1.7)		(34.4)
AEP Transmission Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		3.0	[37],[38]	7.1	[39],[40]	(1.7)	[23],[41]	(34.4)	[24],[42]
AEP Transmission Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[38]	0.0	[40]	0.0	[23]	0.0	[24]
AEP Transmission Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		122.5				122.5				113.8
Appalachian Power Co [Member]
Disaggregation of Revenue
Revenues		961.8		888.9		2,776.0		2,569.8
Revenue, Performance Obligation
Fixed Performance Obligations		74.4				74.4
Appalachian Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		62.5		67.6		193.2		187.6
Revenue Textuals
Affiliated Companies - Contracts with Customers		91.7				91.7				94.0
Appalachian Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		802.3		705.5		2,362.2		2,139.7
Appalachian Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		397.1		360.5		1,192.4		1,131.7
Appalachian Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		181.3		161.1		516.2		467.6
Appalachian Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		197.1		163.3		575.4	[23]	479.0	[24]
Appalachian Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		26.8		20.6		78.2		61.4
Appalachian Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		124.9		149.4		354.6		351.0
Appalachian Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		79.4	[25]	107.9	[26]	223.8	[27]	227.6	[28]
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		36.0		44.0		121.0		122.0
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		45.5	[29]	41.5	[30]	130.8	[31]	123.4	[32]
Appalachian Power Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		22.0				64.0
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		35.2	[33]	33.7	[34]	60.0	[35]	78.6	[36]
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		962.4		888.6		2,776.8		2,569.3
Appalachian Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.6)		0.3		(0.8)		0.5
Appalachian Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(0.7)	[37],[38]	0.0	[39],[40]	(0.9)	[23],[41]	0.1	[24],[42]
Appalachian Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.3		2.9		9.8		11.8
Revenues		0.1	[38]	0.3	[40]	0.1	[23]	0.4	[24]
Appalachian Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		69.3				69.3				64.5
Appalachian Power Co [Member] | 2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		4.0				4.0
Appalachian Power Co [Member] | 2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		32.2				32.2
Appalachian Power Co [Member] | 2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		26.6				26.6
Appalachian Power Co [Member] | After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		11.6				11.6
Indiana Michigan Power Co [Member]
Disaggregation of Revenue
Revenues		676.3		715.4		1,938.5		1,971.6
Revenue, Performance Obligation
Fixed Performance Obligations		23.2				23.2
Indiana Michigan Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		0.6		2.0		3.7		11.1
Revenue Textuals
Affiliated Companies - Contracts with Customers		69.4				69.4				104.0
Indiana Michigan Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		550.3		549.7		1,566.4		1,540.9
Indiana Michigan Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		230.7		238.6		655.5		665.6
Indiana Michigan Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		159.2		154.3		439.5		419.5
Indiana Michigan Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		159.1		155.6		467.6	[23]	452.1	[24]
Indiana Michigan Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.3		1.2		3.8		3.7
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		100.6		135.1		285.8		337.2
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		90.2	[25]	126.3	[26]	257.7	[27]	310.9	[28]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		10.4	[29]	8.8	[30]	28.1	[31]	26.3	[32]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		26.2	[33]	30.6	[34]	92.6	[35]	86.3	[36]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		18.0		15.0		52.0		44.0
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		677.1		715.4		1,944.8		1,964.4
Indiana Michigan Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.8)		0.0		(6.3)		7.2
Indiana Michigan Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(2.9)	[37],[38]	0.0	[39],[40]	(8.4)	[23],[41]	7.3	[24],[42]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4.2		4.4		9.7		10.0
Revenues		2.1	[38]	0.0	[40]	2.1	[23]	(0.1)	[24]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		15.4		13.3		45.8		38.4
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		50.1				50.1				75.3
Indiana Michigan Power Co [Member] | 2023 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		1.1				1.1
Indiana Michigan Power Co [Member] | 2024-2025[Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8				8.8
Indiana Michigan Power Co [Member] | 2026-2027 [Member]
Revenue, Performance Obligation
Fixed Performance Obligations		8.8				8.8
Indiana Michigan Power Co [Member] | After 2027
Revenue, Performance Obligation
Fixed Performance Obligations		4.5				4.5
Ohio Power Co [Member]
Disaggregation of Revenue
Revenues		989.5		1,021.3		2,903.2		2,674.2
Ohio Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		7.8		4.0		23.6		11.6
Revenue Textuals
Affiliated Companies - Contracts with Customers		129.3				129.3				100.9
Ohio Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		919.0		943.6		2,708.4		2,440.2
Ohio Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		536.3		517.9		1,491.6		1,363.3
Ohio Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		275.3		266.1		811.6		681.9
Ohio Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		103.6		156.1		394.0	[23]	384.8	[24]
Ohio Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.8		3.5		11.2		10.2
Ohio Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.4		21.5		60.3		64.4
Ohio Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[25]	0.0	[26]	0.0	[27]	0.0	[28]
Ohio Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		21.4	[29]	21.5	[30]	60.3	[31]	64.4	[32]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		49.2	[33]	64.8	[34]	127.9	[35]	169.6	[36]
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		989.6		1,029.9		2,896.6		2,674.2
Ohio Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(0.1)		(8.6)		6.6		0.0
Ohio Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(3.1)	[37],[38]	(14.1)	[39],[40]	(13.5)	[23],[41]	(18.6)	[24],[42]
Ohio Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3.0		2.1		10.3		6.0
Revenues		3.0	[38]	5.5	[40]	20.1	[23]	18.6	[24]
Ohio Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		67.3				67.3				49.9
Public Service Co Of Oklahoma [Member]
Disaggregation of Revenue
Revenues		644.2		608.2		1,535.9		1,438.7
Public Service Co Of Oklahoma [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		0.2		0.7		1.0		2.1
Revenue Textuals
Affiliated Companies - Contracts with Customers		31.9				31.9				52.2
Public Service Co Of Oklahoma [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		630.3		582.0		1,487.1		1,369.9
Public Service Co Of Oklahoma [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		310.5		299.6		667.9		650.7
Public Service Co Of Oklahoma [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		171.9		153.4		412.7		372.1
Public Service Co Of Oklahoma [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		114.1		98.9		320.2	[23]	270.0	[24]
Public Service Co Of Oklahoma [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		33.8		30.1		86.3		77.1
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.9		19.6		32.3		48.1
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(4.9)	[25]	9.4	[26]	0.3	[27]	19.2	[28]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		10.8	[29]	10.2	[30]	32.0	[31]	28.9	[32]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		5.4	[33]	6.4	[34]	14.9	[35]	21.4	[36]
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		641.6		608.0		1,534.3		1,439.4
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.6		0.2		1.6		(0.7)
Public Service Co Of Oklahoma [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		2.6	[37],[38]	0.2	[39],[40]	1.6	[23],[41]	(0.7)	[24],[42]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1.4		1.0		5.1		3.7
Revenues		0.0	[38]	0.0	[40]	0.0	[23]	0.0	[24]
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		13.8				13.8				18.8
Southwestern Electric Power Co [Member]
Disaggregation of Revenue
Revenues		654.8		717.5		1,708.5		1,748.9
Southwestern Electric Power Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		14.5		18.2		40.7		43.7
Revenue Textuals
Affiliated Companies - Contracts with Customers		43.8				43.8				65.4
Southwestern Electric Power Co [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		569.3		576.7		1,447.6		1,406.3
Southwestern Electric Power Co [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		286.5		285.5		647.5		650.0
Southwestern Electric Power Co [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		174.9		182.3		472.2		458.8
Southwestern Electric Power Co [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		105.5		108.3		320.3	[23]	290.1	[24]
Southwestern Electric Power Co [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2.4		0.6		7.6		7.4
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		79.2		129.9		243.9		323.0
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		36.8	[25]	87.6	[26]	120.3	[27]	206.2	[28]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		42.4	[29]	42.3	[30]	123.6	[31]	116.8	[32]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		17.0				43.0
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		6.0	[33]	7.6	[34]	20.9	[35]	18.9	[36]
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		654.5		714.2		1,712.4		1,748.2
Southwestern Electric Power Co [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0.3		3.3		(3.9)		0.7
Southwestern Electric Power Co [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.3	[37],[38]	3.3	[39],[40]	(3.9)	[23],[41]	0.7	[24],[42]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.5		0.5		1.8		1.5
Revenues		0.0	[38]	0.0	[40]	0.0	[23]	0.0	[24]
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member] | Related Party
Revenue Textuals
Affiliated Companies - Contracts with Customers		23.7				23.7				$ 19.1
Consolidation Eliminations [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Revenues		(508.4)		(425.0)		(1,416.3)		(1,190.5)
Consolidation Eliminations [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		(508.4)		(425.0)		(1,416.3)		(1,190.5)
Consolidation Eliminations [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.3)		(0.3)		(0.6)		(0.7)
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		(0.3)		(0.3)		(0.6)	[1]	(0.7)	[2]
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		(464.6)		(395.2)		(1,282.3)		(1,103.9)
Consolidation Eliminations [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(0.3)		(0.2)		(0.2)		(0.1)	[2]
Consolidation Eliminations [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(425.1)	[3]	(392.7)	[4]	(1,229.7)	[5]	(1,086.5)	[6]
Consolidation Eliminations [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(2.5)	[7]	(2.5)	[8]	(5.7)	[1]	(6.2)	[2]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(36.7)	[9]	0.2		(46.7)	[10]	(11.1)	[11]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(48.5)	[12]	(31.9)	[13]	(132.1)	[14]	(71.6)	[15]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		(513.4)		(427.4)		(1,415.0)		(1,176.2)
Consolidation Eliminations [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		5.0		2.4		(1.3)		(14.3)
Consolidation Eliminations [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		5.7	[7],[16]	4.4	[8],[17]	2.3	[1],[18]	(7.4)	[2],[19]
Consolidation Eliminations [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		(0.7)	[7]	(2.0)	[8],[20]	(3.6)	[1],[21]	(6.9)	[2],[22]
Consolidation Eliminations [Member] | AEP Transmission Co [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Revenues		0.0		0.0		0.0		0.0
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Vertically Integrated Utilities [Member]
Disaggregation of Revenue
Revenues		3,205.4		3,226.3		8,737.7		8,562.2
Vertically Integrated Utilities [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		47.3		51.7		134.3		145.8
Vertically Integrated Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		2,846.5		2,735.9		7,739.9		7,368.8
Vertically Integrated Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,326.7		1,298.0		3,459.1		3,428.1
Vertically Integrated Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		753.3		725.1		2,029.4		1,922.8
Vertically Integrated Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		699.9		658.5		2,069.1	[1]	1,863.3	[2]
Vertically Integrated Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		66.6		54.3		182.3		154.6
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		294.9		419.6		847.3		1,009.2
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		174.3		299.3		498.5		674.8	[2]
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		120.6	[3]	120.3	[4]	348.8	[5]	334.4	[6]
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers						125.0		120.0
Vertically Integrated Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[7]	0.0	[8]	0.0	[1]	0.0	[2]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[9]	0.0		0.0	[10]	0.0	[11]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		61.3	[12]	69.7	[13]	155.8	[14]	180.5	[15]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		3,202.7		3,225.2		8,743.0		8,558.5
Vertically Integrated Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		2.7		1.1		(5.3)		3.7
Vertically Integrated Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.5	[7],[16]	0.9	[8],[17]	(7.5)	[1],[18]	3.4	[2],[19]
Vertically Integrated Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		2.2	[7]	0.2	[8],[20]	2.2	[1],[21]	0.3	[2],[22]
Transmission And Distribution Utilities [Member]
Disaggregation of Revenue
Revenues		1,544.1		1,530.2		4,348.5		4,078.6
Transmission And Distribution Utilities [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		8.9		4.7		27.2		14.1
Transmission And Distribution Utilities [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,312.1		1,301.4		3,666.6		3,405.2
Transmission And Distribution Utilities [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		772.5		721.9		2,003.4		1,884.1
Transmission And Distribution Utilities [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		387.7		373.0		1,121.9		994.4
Transmission And Distribution Utilities [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		138.9		191.5		503.9	[1]	487.3	[2]
Transmission And Distribution Utilities [Member] | Other Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		13.0		15.0		37.4		39.4
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		176.0		162.3		524.3		482.1
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0	[2]
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		176.0	[3]	162.3	[4]	524.3	[5]	482.1	[6]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[7]	0.0	[8]	0.0	[1]	0.0	[2]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[9]	0.0		0.0	[10]	0.0	[11]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		58.2	[12]	74.5	[13]	157.1	[14]	194.2	[15]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		1,546.3		1,538.2		4,348.0		4,081.5
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		(2.2)		(8.0)		0.5		(2.9)
Transmission And Distribution Utilities [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		(5.0)	[7],[16]	(13.5)	[8],[17]	(19.5)	[1],[18]	(21.5)	[2],[19]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		2.8	[7]	5.5	[8],[20]	20.0	[1],[21]	18.6	[2],[22]
AEP Transmission Holdco [Member]
Disaggregation of Revenue
Revenues		476.7		430.9		1,390.8		1,221.1
AEP Transmission Holdco [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Holdco [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Holdco [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Holdco [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0	[1]	0.0	[2]
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		466.1		424.9		1,372.0		1,261.0
AEP Transmission Holdco [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0	[2]
AEP Transmission Holdco [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		466.1	[3]	424.9	[4]	1,372.0	[5]	1,261.0	[6]
AEP Transmission Holdco [Member] | Wholesale Transmission [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		366.0		342.0		1,100.0		1,000.0
AEP Transmission Holdco [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[7]	0.0	[8]	0.0	[1]	0.0	[2]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[9]	0.0		0.0	[10]	0.0	[11]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		4.8	[12]	(0.3)	[13]	12.7	[14]	(0.3)	[15]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		470.9		424.6		1,384.7		1,260.7
AEP Transmission Holdco [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		5.8		6.3		6.1		(39.6)
AEP Transmission Holdco [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		5.8	[7],[16]	6.3	[8],[17]	6.1	[1],[18]	(39.6)	[2],[19]
AEP Transmission Holdco [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		0.0	[7]	0.0	[8],[20]	0.0	[1],[21]	0.0	[2],[22]
Generation And Marketing [Member]
Disaggregation of Revenue
Revenues		566.7		735.4		1,225.1		2,014.3
Generation And Marketing [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		39.2		2.3		52.5		17.3
Generation And Marketing [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Generation And Marketing [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Generation And Marketing [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Generation And Marketing [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0	[1]	0.0	[2]
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		562.4		610.9		1,490.2		1,591.9
Generation And Marketing [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		31.8		83.7		83.8		207.0	[2]
Generation And Marketing [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[3]	0.0	[4]	0.0	[5]	0.0	[6]
Generation And Marketing [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		19.8	[7]	44.3	[8]	74.2	[1]	104.9	[2]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		510.8	[9]	482.9		1,332.2	[10]	1,280.0	[11]
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		37.0				47.0		11.0
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.9	[12]	1.7	[13]	7.7	[14]	11.9	[15]
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		563.3		612.6		1,497.9		1,603.8
Generation And Marketing [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		3.4		122.8		(272.8)		410.5
Generation And Marketing [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[7],[16]	0.0	[8],[17]	0.0	[1],[18]	0.0	[2],[19]
Generation And Marketing [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenues		3.4	[7],[43]	122.8	[8],[20]	(272.8)	[1],[21]	410.5	[2],[22]
Other Segments [Member]
Disaggregation of Revenue
Revenues	[44]	57.2		28.3		119.3		72.7
Other Segments [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers	[44]	30.3		17.3		83.9		36.6
Other Segments [Member] | Retail [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Other Segments [Member] | Residential [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Other Segments [Member] | Commercial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Other Segments [Member] | Industrial [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0	[1]	0.0	[2]
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		0.8		2.2		1.7		6.7
Other Segments [Member] | Wholesale Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0	[2]
Other Segments [Member] | Wholesale Transmission [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[3]	0.0	[4]	0.0	[5]	0.0	[6]
Other Segments [Member] | Renewable Generation [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.0	[7]	0.0	[8]	0.0	[1]	0.0	[2]
Other Segments [Member] | Retail, Trading and Marketing Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		0.8	[9]	2.2		1.7	[10]	6.7	[11]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		55.6	[12]	24.3	[13]	113.6	[14]	59.1	[15]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers		56.4		26.5		115.3		65.8
Other Segments [Member] | Alternative and Other [Member]
Disaggregation of Revenue
Revenues		0.8		1.8		4.0		6.9
Other Segments [Member] | Alternative [Member]
Disaggregation of Revenue
Revenues		0.0	[7],[16]	0.0	[8],[17]	0.0	[1],[18]	0.0	[2],[19]
Other Segments [Member] | Other Revenues [Member]
Disaggregation of Revenue
Revenue from Contracts with Customers	[44]	26.9		11.0		35.4		36.1
Revenues		0.8	[7]	1.8	[8],[20]	4.0	[1],[21]	6.9	[2],[22]
Corporate and Other | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers		$ 32.0		$ 18.0
Corporate and Other | Other Revenues [Member] | Related Party
Disaggregation of Revenue
Revenue from Contracts with Customers						$ 87.0		$ 36.0

[1] Amounts include affiliated and nonaffiliated revenues.

[2] Amounts include affiliated and nonaffiliated revenues

[3] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $366 million. The remaining affiliated amounts were immaterial.

[4] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $342 million. The remaining affiliated amounts were immaterial.

[5] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.1 billion. The affiliated revenue for Vertically Integrated Utilities was $125 million. The remaining affiliated amounts were immaterial.

[6] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1 billion. The affiliated revenue for Vertically Integrated Utilities was $120 million. The remaining affiliated amounts were immaterial.

[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 $37 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $47 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 Corporate and Other was $32 million. The remaining affiliated amounts were immaterial.

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

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $87 million. The remaining affiliated amounts were immaterial.

[15] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $36 million. The remaining affiliated amounts were immaterial.

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

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

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

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

[20] Generation & Marketing includes economic hedge activity.

[21] Generation & Marketing includes economic hedge activity.

[22] Generation & Marketing includes economic hedge activity.

[23] Amounts include affiliated and nonaffiliated revenues.

[24] Amounts include affiliated and nonaffiliated revenues.

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

[26] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $44 million primarily related to the PPA with KGPCo.

[27] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $121 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.

[28] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $122 million primarily relating to the PPA with KGPCo.

[29] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $363 million, APCo was $22 million and SWEPCo was $17 million. The remaining affiliated amounts were immaterial.

[30] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $339 million. The remaining affiliated amounts were immaterial.

[31] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.1 billion, APCo was $64 million and SWEPCo was $43 million. The remaining affiliated amounts were immaterial.

[32] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $992 million. The remaining affiliated amounts were immaterial.

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

[34] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $15 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[35] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $52 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[36] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $44 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

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

[38] Amounts include affiliated and nonaffiliated revenues.

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

[40] Amounts include affiliated and nonaffiliated revenues.

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

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

[43] Generation & Marketing includes economic hedge activity.

[44] 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.