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BUSINESS SEGMENT INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 and 2019. 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 2019 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,
2020201920202019
Net revenues:    
DIS business$2,709 $1,877 $6,217 $5,561 
All other operating segments77 79 218 239 
Total net revenues $2,786 $1,956 $6,435 $5,800 
Operating earnings (loss):    
DIS business$840 $345 $1,325 $963 
All other operating segments16 10 29 31 
General corporate activities(138)(42)(178)(126)
Total operating income718 313 1,176 868 
Non-operating income (expense), net35 (43)(50)(120)
Income from continuing operations before income taxes and equity in earnings of equity method investees
753 270 1,126 748 
Income tax expense
(177)(62)(269)(175)
Equity in earnings of equity method investees, net of taxes15 18 33 48 
Income from continuing operations591 226 890 621 
Income from discontinued operations, net of taxes— — — 20 
Net income591 226 890 641 
Less: Net income attributable to noncontrolling interests23 11 38 36 
Net income attributable to Quest Diagnostics$568 $215 $852 $605