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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Percentage of net revenues from Diagnostic Information Services business     90.00% 90.00%
Total net revenues $ 1,943 $ 1,906 $ 3,842 $ 3,769
Total operating income 319 422 598 679
Non-operating expenses, net (27) (39) (60) (124)
Income before income taxes and equity in earnings of equity method investees 292 383 538 555
Income tax expense (94) (183) (172) (250)
Equity in earnings of equity method investees, net of taxes 9 9 16 19
Net income 207 209 382 324
Less: Net income attributable to noncontrolling interests 14 14 25 26
Net income attributable to Quest Diagnostics 193 195 357 298
DIS business [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 1,855 1,809 3,667 3,565
Total operating income 347 328 653 606
All other operating segments [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 88 97 175 204
Total operating income 17 17 30 38
General corporate activities [Member]        
Segment Reporting Information [Line Items]        
Total operating income $ (45) $ 77 $ (85) $ 35