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BUSINESS SEGMENT INFORMATION
 12 Months Ended
Dec. 31, 2020
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 the 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 2020, 2019 and 2018.

    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 December 31, 2020, 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 years ended December 31, 2020, 2019 and 2018. 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 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.
202020192018
Net revenues:  
DIS business$9,139 $7,405 $7,204 
All other operating segments298 321 327 
Total net revenues$9,437 $7,726 $7,531 
Operating earnings (loss):  
DIS business$2,201 $1,298 $1,235 
All other operating segments39 42 47 
General corporate activities(269)(109)(181)
Total operating income1,971 1,231 1,101 
Non-operating expenses, net(87)(155)(175)
Income from continuing operations before income taxes and equity in earnings of equity method investees
1,884 1,076 926 
Income tax expense(460)(247)(182)
Equity in earnings of equity method investees, net of taxes75 57 44 
Income from continuing operations1,499 886 788 
Income from discontinued operations, net of taxes— 20 — 
Net income1,499 906 788 
Less: Net income attributable to noncontrolling interests68 48 52 
Net income attributable to Quest Diagnostics$1,431 $858 $736 

    Depreciation and amortization expense for the years ended December 31, 2020, 2019 and 2018 were as follows:
    
202020192018
DIS business$249 $226 $213 
All other operating segments8 6 6 
General corporate104 97 90 
Total depreciation and amortization$361 $329 $309 
    Capital expenditures for the years ended December 31, 2020, 2019 and 2018 were as follows:
202020192018
DIS business$394 $373 $330 
All other operating segments15 20 16 
General corporate9 7 37 
Total capital expenditures$418 $400 $383 

    Net revenues by major service for the years ended December 31, 2020, 2019 and 2018 were as follows:
202020192018
Routine clinical testing services$3,836 $4,206 $4,217 
COVID-19 testing services2,723 — — 
Gene-based and esoteric (including advanced diagnostics) testing services2,098 2,620 2,409 
Anatomic pathology testing services482 579 578 
All other298 321 327 
Total net revenues$9,437 $7,726 $7,531