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Related Party Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Affiliated Revenues and Purchases      
Affiliated Revenues $ 0 $ 0 $ 0
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net $ 73,339,100 68,304,100  
AEP Wind Holdings LLC PPAs [Abstract]      
Equity Method Investment, Ownership Percentage 50.00%    
Charitable Contribution to AEP Foundation [Abstract]      
Related Party Charitable Contribuions to AEP Foundation $ 75,000    
Rockport Plant, Unit 2 [Member]      
Related Party Transactions (Textuals)      
Jointly Owned Utility Plant, Proportionate Ownership Share 100.00%    
BP Wind Energy [Member]      
AEP Wind Holdings LLC PPAs [Abstract]      
Equity Method Investment, Ownership Percentage 50.00%    
Generation and Marketing [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues $ 18,000 55,400 104,600
Generation and Marketing [Member] | BP Wind Energy [Member]      
AEP Wind Holdings LLC PPAs [Abstract]      
Equity Method Investment, Ownership Percentage 50.00%    
Appalachian Power Co. to AEP Transmission Co [Member]      
Joint License Agreement      
Joint License Agreement $ 2,500 2,400 900
Indiana Michigan Power Co to Kentucky Power Co [Member]      
Related Party Transactions (Textuals)      
Percentage of Power Sold under Unit Power Agreement 30.00%    
AEP Generating Co to Indiana Michigan Power Co [Member]      
Cook Coal Terminal      
Coal Transloading Services $ 9,000 11,000 12,000
Railcar Maintenance $ 600 300 900
AEP Generating Co to Kentucky Power Co [Member]      
Related Party Transactions (Textuals)      
Percentage of Power Sold under Unit Power Agreement 30.00%    
AEP Generating Co to Public Service Co of Oklahoma [Member]      
Cook Coal Terminal      
Railcar Maintenance $ 600 400 700
AEP Generating Co To Southwestern Electric Power Co [Member]      
Cook Coal Terminal      
Railcar Maintenance 2,700 2,800 3,000
AEP Energy Partners, Inc. to AEP Texas Inc. [Member]      
Oklaunion PPA between AEP Texas and AEPEP      
Oklaunion Purchase Power Agreement     88,000
Indiana Michigan Power Co to AEP Transmission Co [Member]      
Joint License Agreement      
Joint License Agreement 6,100 4,800 3,000
Kentucky Power Co to AEP Transmission Co [Member]      
Joint License Agreement      
Joint License Agreement 600 500 400
Ohio Power Co to AEP Transmission Co [Member]      
Joint License Agreement      
Joint License Agreement 5,200 4,600 4,500
Public Service Co of Oklahoma to AEP Transmission Co [Member]      
Joint License Agreement      
Joint License Agreement 100 400 400
Wheeling Power Co to AEP Transmission Co [Member]      
Joint License Agreement      
Joint License Agreement 200 200 200
AEP Generating Co [Member]      
Barging, Urea Transloading and Other Services      
Expenses from Barging, Urea Transloading and Other Services $ 11,300 7,600 10,600
AEP Generating Co [Member] | Rockport Plant, Unit 2 [Member]      
Related Party Transactions (Textuals)      
Jointly Owned Utility Plant, Proportionate Ownership Share 50.00%    
AEP Generating Co [Member] | AEP Generating Co to Indiana Michigan Power Co [Member] | Rockport Plant, Unit 2 [Member]      
Related Party Transactions (Textuals)      
Jointly Owned Utility Plant, Proportionate Ownership Share 100.00%    
AEP Transmission Co [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues $ 1,354,500 1,171,500 954,600
Revenue from Related Parties, Net 1,283,800 1,153,900 896,300
Sales and Purchases of Property      
Related Party Sales of Property 2,300 1,400 200
Related Party Purchases of Property 11,600 16,700 6,000
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net 13,339,900 12,101,000  
Charitable Contribution to AEP Foundation [Abstract]      
Related Party Charitable Contribuions to AEP Foundation 11,100    
AEP Transmission Co [Member] | Direct Sales to East Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0 0 0
AEP Transmission Co [Member] | Auction Sales to OPCo [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
AEP Transmission Co [Member] | Direct Sales to AEPEP [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
AEP Transmission Co [Member] | Transmission Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 1,276,400 1,136,100 885,000
AEP Transmission Co [Member] | Other Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 7,400 17,800 11,300
AEP Transmission Co [Member] | Direct Sales to West Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0    
Appalachian Power Co [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 256,100 197,900 174,700
Transmission Service Charges      
PJM Net Transmission Service Charges 345,100 302,000 243,200
Barging, Urea Transloading and Other Services      
Expenses from Barging, Urea Transloading and Other Services 36,100 40,100 43,700
Sales and Purchases of Property      
Related Party Sales of Property 16,000 6,200 5,700
Related Party Purchases of Property 2,400 1,000 1,300
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net 12,379,200 11,804,300  
Charitable Contribution to AEP Foundation [Abstract]      
Related Party Charitable Contribuions to AEP Foundation 12,500    
Appalachian Power Co [Member] | Direct Sales to East Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 169,700 128,600 112,500
Appalachian Power Co [Member] | Auction Sales to OPCo [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues [1]     5,300
Appalachian Power Co [Member] | Direct Sales to AEPEP [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
Appalachian Power Co [Member] | Transmission Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 77,500 60,300 49,100
Appalachian Power Co [Member] | Other Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 8,900 9,000 7,800
Appalachian Power Co [Member] | Direct Sales to West Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0    
Indiana Michigan Power Co [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 15,300 3,800 10,500
Cost of Purchased Power from Affiliate 241,800 217,900 172,800
Transmission Service Charges      
PJM Net Transmission Service Charges 220,800 186,700 145,900
Sales and Purchases of Property      
Related Party Sales of Property 5,300 7,000 1,500
Related Party Purchases of Property 2,000 600 3,400
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net 7,411,500 7,310,900  
Charitable Contribution to AEP Foundation [Abstract]      
Related Party Charitable Contribuions to AEP Foundation $ 11,000    
Indiana Michigan Power Co [Member] | Rockport Plant, Unit 2 [Member]      
Related Party Transactions (Textuals)      
Jointly Owned Utility Plant, Proportionate Ownership Share 50.00%    
Indiana Michigan Power Co [Member] | Auction Purchases From AEPEP [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate [1] $ 0 0 0
Indiana Michigan Power Co [Member] | Auction Purchases From AEP Energy [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate [1]   0 0
Indiana Michigan Power Co [Member] | Auction Purchases from AEPSC [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate [1]     0
Indiana Michigan Power Co [Member] | Direct Purchases from AEGCo [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate 241,800 217,900 172,800
Indiana Michigan Power Co [Member] | Direct Sales to East Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0 0 0
Indiana Michigan Power Co [Member] | Auction Sales to OPCo [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues [1]     3,100
Indiana Michigan Power Co [Member] | Direct Sales to AEPEP [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
Indiana Michigan Power Co [Member] | Transmission Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 7,700 (2,500) 2,900
Indiana Michigan Power Co [Member] | Other Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues [2] 7,600 6,300 4,500
Indiana Michigan Power Co [Member] | Direct Sales to West Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0    
Indiana Michigan Power Co [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate 12,000 10,000 11,000
Kentucky Power Co [Member]      
Barging, Urea Transloading and Other Services      
Expenses from Barging, Urea Transloading and Other Services 2,000 3,100 3,200
Related Party Transactions (Textuals)      
Capacity Sales 199    
Ohio Power Co [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 18,800 24,800 41,500
Cost of Purchased Power from Affiliate 9,800 51,900 119,700
Transmission Service Charges      
PJM Net Transmission Service Charges 608,200 508,900 417,400
Sales and Purchases of Property      
Related Party Sales of Property 7,600 9,200 7,000
Related Party Purchases of Property 2,000 1,400 1,200
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net 8,609,300 7,963,000  
Charitable Contribution to AEP Foundation [Abstract]      
Related Party Charitable Contribuions to AEP Foundation 8,100    
Ohio Power Co [Member] | Auction Purchases From AEPEP [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate [1] 9,800 26,600 51,000
Ohio Power Co [Member] | Auction Purchases From AEP Energy [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate [1]   25,300 58,700
Ohio Power Co [Member] | Auction Purchases from AEPSC [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate [1]     10,000
Ohio Power Co [Member] | Direct Purchases from AEGCo [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate 0 0 0
Ohio Power Co [Member] | Direct Sales to East Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0 0 0
Ohio Power Co [Member] | Auction Sales to OPCo [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
Ohio Power Co [Member] | Direct Sales to AEPEP [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
Ohio Power Co [Member] | Transmission Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues (3,600) (1,100) 16,600
Ohio Power Co [Member] | Other Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 22,400 25,900 24,900
Ohio Power Co [Member] | Direct Sales to West Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0    
Ohio Power Co [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate 24,000 20,000 23,000
Public Service Co Of Oklahoma [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 2,900 4,200 5,200
Transmission Service Charges      
SPP Net Transmission Service Charges 110,800 94,700 69,700
Sales and Purchases of Property      
Related Party Sales of Property 2,500 500 1,100
Related Party Purchases of Property 7,600 300 400
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net 5,626,500 4,802,800  
Charitable Contribution to AEP Foundation [Abstract]      
Related Party Charitable Contribuions to AEP Foundation 5,800    
Public Service Co Of Oklahoma [Member] | OKTCo Radial Asset Transfer [Member] | Net Book Value of Radial Assets [Member]      
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net   60,000  
Public Service Co Of Oklahoma [Member] | Direct Sales to East Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0 0 0
Public Service Co Of Oklahoma [Member] | Auction Sales to OPCo [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
Public Service Co Of Oklahoma [Member] | Direct Sales to AEPEP [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
Public Service Co Of Oklahoma [Member] | Transmission Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0 0 0
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 2,900 4,200 5,200
Public Service Co Of Oklahoma [Member] | Direct Sales to West Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0    
Southwestern Electric Power Co [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 59,500 41,400 41,000
Revenue from Related Parties, Net 53,900 41,000 39,000
Transmission Service Charges      
SPP Net Transmission Service Charges 62,100 56,200 31,300
Sales and Purchases of Property      
Related Party Sales of Property 1,000 400 800
Related Party Purchases of Property 2,800 300 2,800
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net 8,262,200 7,400,100  
Charitable Contribution to AEP Foundation [Abstract]      
Related Party Charitable Contribuions to AEP Foundation 8,800    
Southwestern Electric Power Co [Member] | Direct Sales to East Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0 0 0
Southwestern Electric Power Co [Member] | Auction Sales to OPCo [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
Southwestern Electric Power Co [Member] | Direct Sales to AEPEP [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
Southwestern Electric Power Co [Member] | Transmission Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 51,500 39,600 37,400
Southwestern Electric Power Co [Member] | Other Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 1,100 1,400 1,600
Southwestern Electric Power Co [Member] | Direct Sales to West Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 1,300    
Southwestern Electric Power Co [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]      
Affiliated Revenues and Purchases      
Cost of Purchased Power from Affiliate 14,000 14,000 14,000
Wheeling Power Co [Member] [Domain]      
Barging, Urea Transloading and Other Services      
Expenses from Barging, Urea Transloading and Other Services 4,700 3,200 3,300
AEP Texas Inc. [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 3,500 3,900 90,800
ERCOT Transmission Service Charges      
Billings from ETT for ERCOT Wholesale Transmission Services 28,000 28,000 28,000
Sales and Purchases of Property      
Related Party Sales of Property 3,000 400 900
Related Party Purchases of Property 1,300 400 1,500
Related Party Transactions (Textuals)      
Total Property, Plant and Equipment, Net 11,681,600 10,635,400  
Charitable Contribution to AEP Foundation [Abstract]      
Related Party Charitable Contribuions to AEP Foundation $ 9,900    
AEP Texas Inc. [Member] | Oklaunion Generating Station [Member]      
Related Party Transactions (Textuals)      
Jointly Owned Utility Plant, Proportionate Ownership Share 54.69%    
AEP Texas Inc. [Member] | Direct Sales to East Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues $ 0 0 0
AEP Texas Inc. [Member] | Auction Sales to OPCo [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     0
AEP Texas Inc. [Member] | Direct Sales to AEPEP [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues     87,500
AEP Texas Inc. [Member] | Transmission Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 0 0 0
AEP Texas Inc. [Member] | Other Revenues [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues 3,500 $ 3,900 $ 3,300
AEP Texas Inc. [Member] | Direct Sales to West Affiliates [Member]      
Affiliated Revenues and Purchases      
Affiliated Revenues $ 0    
[1] Refer to the Ohio Auctions section below for further information regarding these amounts.
[2] I&M’s affiliated revenues exclude capacity sales to KPCo from Rockport Plant, Unit 2 and barging, urea transloading and other transportation services to affiliates. See sections “Unit Power Agreements” and “I&M Barging, Urea Transloading and Other Services” below for additional information.