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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Percentage of net revenues 100.00% 100.00% 100.00% 100.00%
Total net revenues $ 2,774 $ 2,786 $ 8,044 $ 6,435
Total operating income 652 718 1,845 1,176
Non-operating income (expense), net 2 35 252 (50)
Income before income taxes and equity in earnings of equity method investees 654 753 2,097 1,126
Income tax expense (153) (177) (483) (269)
Equity in earnings of equity method investees, net of taxes 26 15 53 33
Net income 527 591 1,667 890
Less: Net income attributable to noncontrolling interests 22 23 62 38
Net income attributable to Quest Diagnostics 505 568 1,605 852
Routine clinical testing services        
Segment Reporting Information [Line Items]        
Total net revenues 1,210 1,055 3,392 2,812
COVID-19 Testing Services        
Segment Reporting Information [Line Items]        
Total net revenues 709 965 2,048 1,571
Gene-based and esoteric testing services        
Segment Reporting Information [Line Items]        
Total net revenues 646 556 1,972 1,491
Anatomic pathology testing services        
Segment Reporting Information [Line Items]        
Total net revenues 138 133 408 343
All other services        
Segment Reporting Information [Line Items]        
Total net revenues $ 71 $ 77 $ 224 $ 218
DIS business        
Segment Reporting Information [Line Items]        
Percentage of net revenues 97.00% 97.00% 97.00% 97.00%
Total net revenues $ 2,703 $ 2,709 $ 7,820 $ 6,217
Total operating income $ 713 $ 840 $ 2,026 $ 1,325
DIS business | Minimum        
Segment Reporting Information [Line Items]        
Percentage of net revenues 95.00% 95.00% 95.00% 95.00%
All other operating segments        
Segment Reporting Information [Line Items]        
Total net revenues $ 71 $ 77 $ 224 $ 218
Total operating income 8 16 26 29
General corporate activities        
Segment Reporting Information [Line Items]        
Total operating income $ (69) $ (138) $ (207) $ (178)