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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Percentage of net revenues 100.00% 100.00% 100.00% 100.00%
Total net revenues $ 2,453 $ 2,550 $ 5,064 $ 5,270
Total operating income 388 533 901 1,193
Non-operating (expense) income, net (65) 284 (126) 250
Income before income taxes and equity in earnings of equity method investees 323 817 775 1,443
Income tax expense (77) (177) (187) (330)
Equity in earnings of equity method investees, net of taxes 4 10 35 27
Net income 250 650 623 1,140
Less: Net income attributable to noncontrolling interests 16 19 34 40
Net income attributable to Quest Diagnostics 234 631 589 1,100
Routine clinical testing and other services        
Segment Reporting Information [Line Items]        
Total net revenues 1,098 1,150 2,164 2,182
COVID-19 Testing Services        
Segment Reporting Information [Line Items]        
Total net revenues 355 511 954 1,339
Gene-based and esoteric testing services        
Segment Reporting Information [Line Items]        
Total net revenues 787 673 1,526 1,326
Anatomic pathology testing services        
Segment Reporting Information [Line Items]        
Total net revenues 144 140 281 270
All other services        
Segment Reporting Information [Line Items]        
Total net revenues $ 69 $ 76 $ 139 $ 153
DIS business        
Segment Reporting Information [Line Items]        
Percentage of net revenues 97.00% 97.00% 97.00% 97.00%
Total net revenues $ 2,384 $ 2,474 $ 4,925 $ 5,117
Total operating income $ 442 $ 601 $ 1,004 $ 1,313
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 $ 69 $ 76 $ 139 $ 153
Total operating income 6 9 13 18
General corporate activities        
Segment Reporting Information [Line Items]        
Total operating income $ (60) $ (77) $ (116) $ (138)