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BUSINESS SEGMENT INFORMATION
 6 Months Ended
Jun. 30, 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 June 30, 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 and six months ended June 30, 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
Six Months Ended
June 30, 2026June 30, 2026
DISTotalDISTotal
Net revenues$2,978 $2,978 $5,810 $5,810 
DS revenues65 128 
Total net revenues$3,043 $5,938 
Less: Other segment items2,437 4,812 
Segment operating income$541 $541 $998 $998 
DS operating income10 17 
General corporate activities(92)(157)
Total operating income459 858 
Non-operating expense, net(47)(112)
Income before income taxes and equity in earnings of equity method investees412 746 
Income tax expense(88)(162)
Equity in earnings of equity method investees, net of taxes10 14 
Net income334 598 
Less: Net income attributable to noncontrolling interests14 26 
Net income attributable to Quest Diagnostics$320 $572 

Three Months EndedSix Months Ended
June 30, 2025June 30, 2025
DISTotalDISTotal
Net revenues$2,699 $2,699 $5,288 $5,288 
DS revenues62 125 
Total net revenues$2,761 $5,413 
Less: Other segment items2,205 4,380 
Segment operating income$494 $494 $908 $908 
DS operating income7 15 
General corporate activities(63)(139)
Total operating income438 784 
Non-operating expense, net(54)(124)
Income before income taxes and equity in earnings of equity method investees384 660 
Income tax expense(97)(156)
Equity in earnings of equity method investees, net of taxes9 27 
Net income296531
Less: Net income attributable to noncontrolling interests1429
Net income attributable to Quest Diagnostics$282 $502 
    
    Depreciation and amortization expense for the three and six months ended June 30, 2026 and 2025 was as follows:
    
Three Months Ended June 30,Six Months Ended June 30,
2026202520262025
DIS business$105 $100 $211 $197 
All other operating segments3 3 6 7 
General corporate38 40 76 79 
Total depreciation and amortization$146 $143 $293 $283