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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Percentage of net revenues from Diagnostic Information Services business     90.00% 90.00%
Total net revenues $ 1,880 $ 1,904 $ 5,644 $ 5,552
Total operating income 631 256 1,160 726
Non-operating expenses, net (39) (42) (263) (119)
Income before income taxes and equity in earnings of equity method investees 592 214 897 607
Income tax expense (239) (82) (359) (234)
Equity in earnings of equity method investees, net of taxes 1 7 15 19
Net income 354 139 553 392
Less: Net income attributable to noncontrolling interests 12 10 32 26
Net income attributable to Quest Diagnostics 342 129 521 366
DIS business        
Segment Reporting Information [Line Items]        
Total net revenues 1,764 1,765 5,227 5,141
Total operating income 294 281 838 805
All other operating segments [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 116 139 417 411
Total operating income 30 23 86 63
General corporate activities [Member]        
Segment Reporting Information [Line Items]        
Total operating income $ 307 $ (48) $ 236 $ (142)