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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Percentage of net revenues 100.00% 100.00%
Total net revenues $ 2,720 $ 1,822
Total operating income 660 175
Non-operating expense, net (34) (57)
Income before income taxes and equity in earnings of equity method investees 626 118
Income tax expense (153) (26)
Equity in earnings of equity method investees, net of taxes 17 14
Net income 490 106
Less: Net income attributable to noncontrolling interests 21 7
Net income attributable to Quest Diagnostics 469 99
Routine clinical testing services    
Segment Reporting Information [Line Items]    
Total net revenues 1,032 945
COVID-19 Testing Services    
Segment Reporting Information [Line Items]    
Total net revenues 828 24
Gene-based and esoteric testing services    
Segment Reporting Information [Line Items]    
Total net revenues 653 641
Anatomic pathology testing services    
Segment Reporting Information [Line Items]    
Total net revenues 130 134
All other services    
Segment Reporting Information [Line Items]    
Total net revenues $ 77 $ 78
DIS business    
Segment Reporting Information [Line Items]    
Percentage of net revenues 97.00% 96.00%
Total net revenues $ 2,643 $ 1,744
Total operating income $ 712 $ 205
DIS business | Minimum    
Segment Reporting Information [Line Items]    
Percentage of net revenues 95.00% 95.00%
All other operating segments    
Segment Reporting Information [Line Items]    
Total net revenues $ 77 $ 78
Total operating income 9 9
General corporate activities    
Segment Reporting Information [Line Items]    
Total operating income $ (61) $ (39)