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BUSINESS SEGMENT INFORMATION (Tables)
9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Summary of Segment Reporting Information by Segment The following table is a summary of segment information for the three and nine months ended September 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 September 30,Nine Months Ended September 30,
2021202020212020
Net revenues:    
DIS business$2,703 $2,709 $7,820 $6,217 
All other operating segments71 77 224 218 
Total net revenues $2,774 $2,786 $8,044 $6,435 
Operating earnings (loss):    
DIS business$713 $840 $2,026 $1,325 
All other operating segments16 26 29 
General corporate activities(69)(138)(207)(178)
Total operating income652 718 1,845 1,176 
Non-operating income (expense), net35 252 (50)
Income before income taxes and equity in earnings of equity method investees654 753 2,097 1,126 
Income tax expense(153)(177)(483)(269)
Equity in earnings of equity method investees, net of taxes26 15 53 33 
Net income527 591 1,667 890 
Less: Net income attributable to noncontrolling interests22 23 62 38 
Net income attributable to Quest Diagnostics$505 $568 $1,605 $852 
Schedule of Revenues by Major Service Net revenues by major service were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Routine clinical testing services$1,210 $1,055 $3,392 $2,812 
COVID-19 testing services709 965 2,048 1,571 
Gene-based and esoteric (including advanced diagnostics) testing services646 556 1,972 1,491 
Anatomic pathology testing services138 133 408 343 
All other71 77 224 218 
Total net revenues$2,774 $2,786 $8,044 $6,435