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BUSINESS SEGMENT INFORMATION
 3 Months Ended
Mar. 31, 2026
Segment Reporting [Abstract]  
BUSINESS SEGMENT INFORMATION BUSINESS SEGMENT INFORMATION
    The Company's DIS business is the only reportable segment based on the manner in which the Chief Executive Officer, who is the Company's Chief Operating Decision Maker ("CODM"), assesses performance and allocates resources across the organization. The CODM uses the reported measurement of segment profit (loss) in assessing segment performance versus budget and when deciding how to allocate resources to segments. The DIS business provides diagnostic information services to a broad range of customers within its primary customer channels - physicians, hospitals, and patients and consumers. The DIS business accounted for greater than 95% of net revenues in both 2026 and 2025.

    All other operating segments include the Company's DS businesses, which consist of its risk assessment services and healthcare information technology businesses. The Company's DS businesses offer solutions for insurers and offer solutions for healthcare providers and payers.
        
    As of March 31, 2026, substantially all of the Company’s services were provided within the United States, and substantially all of the Company’s assets were located within the United States.

    The following table is a summary of segment information for the three months ended March 31, 2026 and 2025. Segment asset information is not presented since it is not received by the CODM at the operating segment level. The CODM regularly reviews certain consolidated expenses, including employee compensation costs. "Other segment items" principally consist of costs for obtaining, transporting and testing specimens, facility costs used for the delivery of the Company's services,
costs associated with the Company's sales and marketing efforts, and costs related to billing operations. Operating income (loss) of each segment represents net revenues less directly identifiable expenses. General corporate activities included in the table below are comprised of general management and administrative corporate expenses, amortization and impairment of intangibles assets and other operating income and expenses, net of certain general corporate activity costs that are allocated to the DIS and DS businesses. The accounting policies of the segments are the same as those of the Company as set forth in Note 2 to the audited consolidated financial statements contained in the Company’s 2025 Annual Report on Form 10-K and Note 2 to the interim unaudited consolidated financial statements.
Three Months Ended
March 31, 2026
DISTotal
Net revenues$2,832 $2,832 
DS revenues63 
Total net revenues$2,895 
Less: Other segment items2,375 
Segment operating income$457 $457 
DS operating income7 
General corporate activities(65)
Total operating income399 
Non-operating expense, net(65)
Income before income taxes and equity in earnings of equity method investees334 
Income tax expense(74)
Equity in earnings of equity method investees, net of taxes4 
Net income264
Less: Net income attributable to noncontrolling interests12
Net income attributable to Quest Diagnostics$252 

Three Months Ended
March 31, 2025
DISTotal
Net revenues$2,589 $2,589 
DS revenues63 
Total net revenues$2,652 
Less: Other segment items2,175 
Segment operating income$414 $414 
DS operating income8 
General corporate activities(76)
Total operating income346 
Non-operating expense, net(70)
Income before income taxes and equity in earnings of equity method investees276 
Income tax expense(59)
Equity in earnings of equity method investees, net of taxes18 
Net income235
Less: Net income attributable to noncontrolling interests15
Net income attributable to Quest Diagnostics$220 
    Depreciation and amortization expense for the three months ended March 31, 2026 and 2025 was as follows:
    
Three Months Ended March 31,
20262025
DIS business$106 $97 
All other operating segments3 4 
General corporate38 39 
Total depreciation and amortization$147 $140