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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Percentage of net revenues from Diagnostic Information Services business     90.00% 90.00%
Total net revenues $ 1,931 $ 1,885 $ 5,773 $ 5,654
Total operating income 298 322 896 1,001
Non-operating expenses, net (40) (33) (100) (157)
Income before income taxes and equity in earnings of equity method investees 258 289 796 844
Income tax expense (92) (95) (264) (345)
Equity in earnings of equity method investees, net of taxes 9 11 25 30
Net income 175 205 557 529
Less: Net income attributable to noncontrolling interests 14 13 39 39
Net income attributable to Quest Diagnostics 161 192 518 490
DIS business [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 1,850 1,800 5,517 5,365
Total operating income 334 329 987 935
All other operating segments [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 81 85 256 289
Total operating income 10 12 40 50
General corporate activities [Member]        
Segment Reporting Information [Line Items]        
Total operating income $ (46) $ (19) $ (131) $ 16