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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 20, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35985    
Entity Registrant Name CDW CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-0273989    
Entity Address, Address Line One 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    
Title of 12(b) Security Common stock, par value $0.01 per share    
Trading Symbol CDW    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 24,542
Entity Common Stock, Shares Outstanding   134,215,119  
Documents Incorporated by Reference
Certain parts of the registrant’s definitive proxy statement for its 2024 annual meeting of stockholders to be held on May 21, 2024, which will be filed with the Securities and Exchange Commission on or before April 30, 2024, are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Entity Central Index Key 0001402057    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false