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BUSINESS SEGMENT INFORMATION
 12 Months Ended
Dec. 31, 2023
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 CODM, assesses performance and allocates resources across the organization. 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 2023, 2022 and 2021.

    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 December 31, 2023, 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, 2023, 2022 and 2021. 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.
202320222021
Net revenues:  
DIS business$8,976 $9,609 $10,494 
All other operating segments276 274 294 
Total net revenues$9,252 $9,883 $10,788 
Operating earnings (loss):  
DIS business$1,547 $1,704 $2,646 
All other operating segments34 20 29 
General corporate activities(319)(296)(294)
Total operating income1,262 1,428 2,381 
Non-operating (expense) income, net(132)(193)218 
Income before income taxes and equity in earnings of equity method investees1,130 1,235 2,599 
Income tax expense(248)(264)(597)
Equity in earnings of equity method investees, net of taxes26 44 78 
Net income908 1,015 2,080 
Less: Net income attributable to noncontrolling interests54 69 85 
Net income attributable to Quest Diagnostics$854 $946 $1,995 

    Depreciation and amortization expense for the years ended December 31, 2023, 2022 and 2021 were as follows:
    
202320222021
DIS business$319 $305 $294 
All other operating segments11 12 10 
General corporate109 120 104 
Total depreciation and amortization$439 $437 $408 
    Capital expenditures for the years ended December 31, 2023, 2022 and 2021 were as follows:
202320222021
DIS business$398 $384 $379 
All other operating segments8 19 14 
General corporate2 1 10 
Total capital expenditures$408 $404 $403 

    The approximate percentage of net revenues by major service for the years ended December 31, 2023, 2022 and 2021 was as follows:
202320222021
Routine clinical testing and other services51 %44 %40 %
COVID-19 testing services2 15 26 
Gene-based and esoteric (including advanced diagnostics) testing services38 32 26 
Anatomic pathology testing services6 6 5 
All other3 3 3 
Net revenues100 %100 %100 %

    The approximate percentage of net revenues by customer channel for the years ended December 31, 2023, 2022 and 2021 was as follows:

202320222021
Physician lab services66 %68 %69 %
Hospital lab services21 18 17 
Other DIS10 11 11 
Total DIS revenues97 97 97 
DS revenues3 3 3 
Total net revenues100 %100 %100 %

    Physician lab services includes net revenues for physicians including those associated with ACOs and FQHCs.