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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Total net revenues $ 1,839 $ 1,889 $ 1,919 $ 1,884 $ 1,865 $ 1,856 $ 1,864 $ 1,817 $ 7,531 $ 7,402 $ 7,214
Total operating income                 1,101 1,165 1,277
Non-operating expenses, net                 (175) (135) (191)
Income before income taxes and equity in earnings of equity method investees                 926 1,030 1,086
Income tax expense                 (182) (241) (429)
Equity in earnings of equity method investees, net of taxes                 44 35 39
Net income 139 227 233 189 267 175 207 175 788 824 696
Less: net income attributable to noncontrolling interests 12 14 14 12 13 14 14 11 52 52 51
Net income attributable to Quest Diagnostics $ 127 $ 213 $ 219 $ 177 $ 254 $ 161 $ 193 $ 164 736 772 645
Depreciation and amortization                 309 270 249
Total capital expenditures                 383 252 293
Routine clinical testing services [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 4,217 4,006 3,878
Gene-based and esoteric (including advanced diagnostics) testing services [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 2,409 2,449 2,335
Anatomic pathology testing services [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 578 612 624
All other services [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 $ 327 $ 335 $ 377
DIS business [Member]                      
Segment Reporting Information [Line Items]                      
Percentage of net revenues from the DIS business                 95.00% 95.00% 95.00%
Total net revenues                 $ 7,204 $ 7,068 $ 6,837
Total operating income                 1,235 1,313 1,244
Depreciation and amortization                 213 189 170
Total capital expenditures                 330 219 264
All other operating segments [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 327 334 377
Total operating income                 47 52 64
Depreciation and amortization                 6 6 6
Total capital expenditures                 16 15 21
General corporate income (expenses), Net [Member]                      
Segment Reporting Information [Line Items]                      
Total operating income                 (181) (200) (31)
Depreciation and amortization                 90 75 73
Total capital expenditures                 $ 37 $ 18 $ 8