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Document and Entity Information
Aug. 12, 2024
Cover [Abstract]  
Document Type 8-K
Document Period End Date Aug. 12, 2024
Entity Registrant Name CDW CORP
Entity Incorporation State Country Code DE
Entity File Number 001-35985
Entity Tax Identification Number 26-0273989
Entity Address Address Line 1 200 N. Milwaukee Avenue
Entity Address City Or Town Vernon Hills
Entity Address State Or Province IL
Entity Address Postal Zip Code 60061
City Area Code 847
Local Phone Number 465-6000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common stock, par value $0.01 per share
Trading Symbol CDW
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001402057
Amendment Flag false