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BUSINESS SEGMENT INFORMATION
 6 Months Ended
Jun. 30, 2021
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 DIS business provides diagnostic information services to a broad range of customers, including patients, clinicians, hospitals, IDNs, health plans, employers, ACOs and DCEs. The Company is the world's leading provider of diagnostic information services, which includes providing information and insights based on an industry-leading menu of routine, non-routine and advanced clinical testing and anatomic pathology testing, and other diagnostic information services. The DIS business accounted for greater than 95% of net revenues in 2021 and 2020.

    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 are the leading provider of risk assessment services for the life insurance industry and offer healthcare organizations and clinicians robust information technology solutions.
        
    As of June 30, 2021, 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, 2021 and 2020. Segment asset information is not presented since it is not used by the CODM at the operating segment level. Operating earnings (loss) of each segment represents net revenues less directly identifiable expenses to arrive at operating income (loss) for the segment. General corporate activities included in the table below are comprised of general management and administrative corporate expenses, amortization and impairment of intangible 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 2020 Annual Report on Form 10-K and Note 2 to the interim unaudited consolidated financial statements.
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Net revenues:    
DIS business$2,474 $1,764 $5,117 $3,508 
All other operating segments76 63 153 141 
Total net revenues $2,550 $1,827 $5,270 $3,649 
Operating earnings (loss):    
DIS business$601 $280 $1,313 $485 
All other operating segments9 4 18 13 
General corporate activities(77)(1)(138)(40)
Total operating income533 283 1,193 458 
Non-operating income (expense), net284 (28)250 (85)
Income before income taxes and equity in earnings of equity method investees817 255 1,443 373 
Income tax expense(177)(66)(330)(92)
Equity in earnings of equity method investees, net of taxes10 4 27 18 
Net income650 193 1,140 299 
Less: Net income attributable to noncontrolling interests19 8 40 15 
Net income attributable to Quest Diagnostics$631 $185 $1,100 $284 

    Net revenues by major service were as follows:

Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Routine clinical testing services$1,150 $812 $2,182 $1,757 
COVID-19 testing services511 582 1,339 606 
Gene-based and esoteric (including advanced diagnostics) testing services673 294 1,326 935 
Anatomic pathology testing services140 76 270 210 
All other76 63 153 141 
Total net revenues$2,550 $1,827 $5,270 $3,649