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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

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