v3.26.3
Cover
Nov. 02, 2026
Entity Information [Line Items]  
Entity Central Index Key 0001702494
Amendment Flag false
Document Type 8-K
Document Period End Date Nov. 02, 2026
Entity Registrant Name AEP TRANSMISSION COMPANY, LLC
Entity Incorporation, State or Country Code DE
Entity File Number 333-217143
Entity Tax Identification Number 46-1125168
Entity Address, Address Line One 1 Riverside Plaza,
Entity Address, City or Town Columbus,
Entity Address, State or Province OH
Entity Address, Postal Zip Code 43215
City Area Code (614)
Local Phone Number 716-1000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false