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BUSINESS SEGMENT INFORMATION
 9 Months Ended
Sep. 30, 2025
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 97% of net revenues in both 2025 and 2024.

    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 September 30, 2025, 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. See Note 6 to the audited consolidated financial statements contained in the Company’s 2024 Annual Report on Form 10-K for a discussion of the Company's acquisition of LifeLabs in Canada during August 2024.

    The following table is a summary of segment information for the three and nine months ended September 30, 2025 and 2024. 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 2024 Annual Report on Form 10-K and Note 2 to the interim unaudited consolidated financial statements.
Three Months Ended
Nine Months Ended
September 30, 2025September 30, 2025
DISTotalDISTotal
Net revenues$2,755 $2,755 $8,043 $8,043 
DS revenues61 186 
Total net revenues$2,816 $8,229 
Less: Other segment items2,273 6,653 
Segment operating income$482 $482 $1,390 $1,390 
DS operating income9 24 
General corporate activities(105)(244)
Total operating income386 1,170 
Non-operating expense, net(58)(182)
Income before income taxes and equity in earnings of equity method investees328 988 
Income tax expense(77)(233)
Equity in earnings of equity method investees, net of taxes8 35 
Net income259 790 
Less: Net income attributable to noncontrolling interests14 43 
Net income attributable to Quest Diagnostics$245 $747 
Three Months EndedNine Months Ended
September 30, 2024September 30, 2024
DISTotalDISTotal
Net revenues$2,427 $2,427 $7,058 $7,058 
DS revenues61 193 
Total net revenues$2,488 $7,251 
Less: Other segment items2,020 5,858 
Segment operating income$407 $407 $1,200 $1,200 
DS operating income6 23 
General corporate activities(83)(238)
Total operating income330 985 
Non-operating expense, net(34)(109)
Income before income taxes and equity in earnings of equity method investees296 876 
Income tax expense(65)(205)
Equity in earnings of equity method investees, net of taxes6 14 
Net income237685
Less: Net income attributable to noncontrolling interests1136
Net income attributable to Quest Diagnostics$226 $649 
    
    Depreciation and amortization expense for the three and nine months ended September 30, 2025 and 2024 was as follows:
    
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
DIS business$99 $90 $296 $258 
All other operating segments3 3 10 9 
General corporate40 32 119 91 
Total depreciation and amortization$142 $125 $425 $358