Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Charitable Contributions to AEP Foundation		$ 75.0
Revenue from Contract with Customers	$ 18,982.3	19,639.5	$ 16,792.0
AEP Texas Inc. [Member]
Related Party Charitable Contributions to AEP Foundation		9.9
Billings from ETT for ERCOT Wholesale Transmission Services	28.7	28.5	28.0
Revenue from Contract with Customers	1,906.1	1,848.0	1,587.7
Revenue from Related Parties, Net	4.9	3.5	3.9
AEP Texas Inc. [Member] \| Direct Sales to East Affiliates [Member] \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
AEP Texas Inc. [Member] \| Direct Sales to West Affiliates [Member] \| Related Party
Revenue from Contract with Customers		0.0
AEP Texas Inc. [Member] \| Transmission Revenues [Member] \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
AEP Texas Inc. [Member] \| Barging, Urea Transloading and Other Transportation Services Revenues Affiliated \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
AEP Texas Inc. [Member] \| Other Revenues [Member] \| Related Party
Revenue from Contract with Customers	4.9	3.5	3.9
AEP Transmission Co [Member]
Related Party Charitable Contributions to AEP Foundation		11.1
Revenue from Contract with Customers	1,720.6	1,651.7	1,410.9
Revenue from Related Parties, Net	1,317.8	1,283.8	1,153.9
AEP Transmission Co [Member] \| Direct Sales to East Affiliates [Member] \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
AEP Transmission Co [Member] \| Direct Sales to West Affiliates [Member] \| Related Party
Revenue from Contract with Customers		0.0
AEP Transmission Co [Member] \| Transmission Revenues [Member] \| Related Party
Revenue from Contract with Customers	1,304.0	1,276.4	1,136.1
AEP Transmission Co [Member] \| Barging, Urea Transloading and Other Transportation Services Revenues Affiliated \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
AEP Transmission Co [Member] \| Other Revenues [Member] \| Related Party
Revenue from Contract with Customers	13.8	7.4	17.8
Appalachian Power Co [Member]
Related Party Charitable Contributions to AEP Foundation		12.5
Expenses from Barging, Urea Transloading and Other Services	39.2	36.1	40.1
PJM Net Transmission Service Charges	365.1	345.1	302.0
Revenue from Contract with Customers	3,740.6	3,520.7	3,092.9
Revenue from Related Parties, Net	239.3	256.1	197.9
Appalachian Power Co [Member] \| Related Party
Revenue from Contract with Customers	239.3	256.1	197.9
Appalachian Power Co [Member] \| Direct Sales to East Affiliates [Member] \| Related Party
Revenue from Contract with Customers	158.7	169.7	128.6
Appalachian Power Co [Member] \| Direct Sales to West Affiliates [Member] \| Related Party
Revenue from Contract with Customers		0.0
Appalachian Power Co [Member] \| Transmission Revenues [Member] \| Related Party
Revenue from Contract with Customers	70.9	77.5	60.3
Appalachian Power Co [Member] \| Barging, Urea Transloading and Other Transportation Services Revenues Affiliated \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Appalachian Power Co [Member] \| Other Revenues [Member] \| Related Party
Revenue from Contract with Customers	9.7	8.9	9.0
Indiana Michigan Power Co [Member]
Related Party Charitable Contributions to AEP Foundation		11.0
PJM Net Transmission Service Charges	226.2	220.8	186.7
Revenue from Contract with Customers	2,522.3	2,659.7	2,330.7
Revenue from Related Parties, Net	57.8	69.6	57.8
Indiana Michigan Power Co [Member] \| Direct Purchases from AEGCo [Member]
Cost of Purchased Power from Affiliate	181.0	242.0	218.0
Indiana Michigan Power Co [Member] \| Direct Sales to East Affiliates [Member] \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Indiana Michigan Power Co [Member] \| Direct Sales to West Affiliates [Member] \| Related Party
Revenue from Contract with Customers		0.0
Indiana Michigan Power Co [Member] \| Transmission Revenues [Member] \| Related Party
Revenue from Contract with Customers	(11.1)	7.7	(2.5)
Indiana Michigan Power Co [Member] \| Barging, Urea Transloading and Other Transportation Services Revenues Affiliated \| Related Party
Revenue from Contract with Customers	59.0	54.1	54.0
Indiana Michigan Power Co [Member] \| Other Revenues [Member] \| Related Party
Revenue from Contract with Customers	9.9	7.8	6.3
Indiana Michigan Power Co [Member] \| AEP Wind Holdings LLC [Member] \| Generation and Marketing [Member]
Cost of Purchased Power from Affiliate	8.0	11.8	9.9
Ohio Power Co [Member]
Cost of Purchased Power from Affiliate	86.8	9.8	51.9
Related Party Charitable Contributions to AEP Foundation		8.1
PJM Net Transmission Service Charges	665.3	608.2	508.9
Revenue from Contract with Customers	3,802.8	3,672.1	2,837.5
Revenue from Related Parties, Net	31.1	18.8	24.8
Ohio Power Co [Member] \| Ohio Auction SSO Load Delivery Purchases from Affiliates [Member]
Cost of Purchased Power from Affiliate	87.0	10.0	52.0
Ohio Power Co [Member] \| Direct Sales to East Affiliates [Member] \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Ohio Power Co [Member] \| Direct Sales to West Affiliates [Member] \| Related Party
Revenue from Contract with Customers		0.0
Ohio Power Co [Member] \| Transmission Revenues [Member] \| Related Party
Revenue from Contract with Customers	3.2	(3.6)	(1.1)
Ohio Power Co [Member] \| Barging, Urea Transloading and Other Transportation Services Revenues Affiliated \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Ohio Power Co [Member] \| Other Revenues [Member] \| Related Party
Revenue from Contract with Customers	27.9	22.4	25.9
Ohio Power Co [Member] \| AEP Wind Holdings LLC [Member] \| Generation and Marketing [Member]
Cost of Purchased Power from Affiliate	16.1	23.6	19.6
Public Service Co Of Oklahoma [Member]
Related Party Charitable Contributions to AEP Foundation		5.8
SPP Net Transmission Service Charges	100.1	110.8	94.7
Revenue from Contract with Customers	1,976.6	1,875.7	1,474.3
Revenue from Related Parties, Net	1.2	2.9	4.2
Public Service Co Of Oklahoma [Member] \| Direct Sales to East Affiliates [Member] \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Public Service Co Of Oklahoma [Member] \| Direct Sales to West Affiliates [Member] \| Related Party
Revenue from Contract with Customers		0.0
Public Service Co Of Oklahoma [Member] \| Transmission Revenues [Member] \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Public Service Co Of Oklahoma [Member] \| Barging, Urea Transloading and Other Transportation Services Revenues Affiliated \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Public Service Co Of Oklahoma [Member] \| Other Revenues [Member] \| Related Party
Revenue from Contract with Customers	1.2	2.9	4.2
Southwestern Electric Power Co [Member]
Related Party Charitable Contributions to AEP Foundation		8.8
SPP Net Transmission Service Charges	49.2	62.1	56.2
Revenue from Contract with Customers	2,192.1	2,283.2	2,126.0
Revenue from Related Parties, Net	46.8	53.9	41.0
Southwestern Electric Power Co [Member] \| Related Party
Revenue from Contract with Customers	81.6	59.5	41.4
Southwestern Electric Power Co [Member] \| Direct Sales to East Affiliates [Member] \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Southwestern Electric Power Co [Member] \| Direct Sales to West Affiliates [Member] \| Related Party
Revenue from Contract with Customers		1.3
Southwestern Electric Power Co [Member] \| Transmission Revenues [Member] \| Related Party
Revenue from Contract with Customers	45.3	51.5	39.6
Southwestern Electric Power Co [Member] \| Barging, Urea Transloading and Other Transportation Services Revenues Affiliated \| Related Party
Revenue from Contract with Customers	0.0	0.0	0.0
Southwestern Electric Power Co [Member] \| Other Revenues [Member] \| Related Party
Revenue from Contract with Customers	1.5	1.1	1.4
Southwestern Electric Power Co [Member] \| AEP Wind Holdings LLC [Member] \| Generation and Marketing [Member]
Cost of Purchased Power from Affiliate	0.0	13.7	14.5
AEP Generating Co [Member]
Expenses from Barging, Urea Transloading and Other Services	9.3	11.3	7.6
Kentucky Power Co [Member]
Expenses from Barging, Urea Transloading and Other Services	0.0	2.0	3.1
Wheeling Power Co [Member] [Domain]
Expenses from Barging, Urea Transloading and Other Services	$ 10.6	$ 4.7	$ 3.2