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Cover
 12 Months Ended
May 16, 2024
Dec. 31, 2023
Cover [Abstract]    
Document Type 8-K  
Document Period End Date May 16, 2024  
Entity Registrant Name Quest Diagnostics Inc  
Entity Incorporation, State or Country Code DE  
Entity File Number 001-12215  
Entity Tax Identification Number 16-1387862  
Entity Address, Address Line One 500 Plaza Drive  
Entity Address, City or Town Secaucus,  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07094  
City Area Code (973)  
Local Phone Number 520-2700  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security Common Stock, $0.01 Par Value  
Trading Symbol DGX  
Security Exchange Name NYSE  
Entity Emerging Growth Company false  
Entity Central Index Key 0001022079  
Amendment Flag false  
Current Fiscal Year End Date   --12-31