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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Percentage of net revenues from the DIS business                 90.00% 90.00% 90.00%
Total net revenues $ 1,849 $ 1,880 $ 1,925 $ 1,839 $ 1,883 $ 1,904 $ 1,902 $ 1,746 $ 7,493 $ 7,435 $ 7,146
Total operating income                 1,399 983 1,475
Non-operating expenses, net                 (296) (160) (151)
Income from continuing operations before income taxes and equity in earnings of equity method investees                 1,103 823 1,324
Income tax expense         44       (373) (262) (500)
Equity in earnings of equity method investees, net of taxes                 23 26 24
Income from continuing operations 200 354 129 70 195 139 142 111 753 587 848
Income from discontinued operations, net of taxes                 0 5 35
Net income 200 354 129 70 200 139 142 111 753 592 883
Less: net income attributable to noncontrolling interests 12 12 11 9 10 10 9 7 44 36 34
Net income attributable to Quest Diagnostics $ 188 $ 342 $ 118 $ 61 $ 190 $ 129 $ 133 $ 104 709 556 849
Depreciation and amortization                 304 314 283
Total capital expenditures                 263 308 231
DIS business [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 6,965 6,873 6,587
Total operating income                 1,118 1,068 1,201
Depreciation and amortization                 212 206 189
Total capital expenditures                 243 283 196
All other operating segments [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 528 562 559
Total operating income                 110 94 76
Depreciation and amortization                 10 13 12
Total capital expenditures                 16 17 26
General corporate income (expenses), Net [Member]                      
Segment Reporting Information [Line Items]                      
Total operating income                 171 (179) 198
Depreciation and amortization                 82 95 82
Total capital expenditures                 $ 4 $ 8 $ 9