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Document and Entity Information
Mar. 01, 2022
Document And Entity Information [Line Items]  
Entity Registrant Name WESCO INTERNATIONAL INC
Amendment Flag false
Entity Central Index Key 0000929008
Document Type 8-K
Document Period End Date Mar. 01, 2022
Entity Incorporation State Country Code DE
Entity File Number 001-14989
Entity Tax Identification Number 25-1723342
Entity Address, Address Line One 225 West Station Square Drive
Entity Address, Address Line Two Suite 700
Entity Address, City or Town Pittsburgh
Entity Address, State or Province PA
Entity Address, Postal Zip Code 15219
City Area Code (412)
Local Phone Number 454-2200
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol WCC
Security Exchange Name NYSE
Series A Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, each representing a 1/100th interest in a share of Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock
Trading Symbol WCC PR A
Security Exchange Name NYSE