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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of net revenues from the DIS business |  |  |  |  |  |  |  |  | 90.00% | 90.00% | 90.00%
Total net revenues | $ 1,936 | $ 1,931 | $ 1,943 | $ 1,899 | $ 1,861 | $ 1,885 | $ 1,906 | $ 1,863 | $ 7,709 | $ 7,515 | $ 7,493
Total operating income |  |  |  |  |  |  |  |  | 1,165 | 1,277 | 1,399
Non-operating expenses, net |  |  |  |  |  |  |  |  | (135) | (191) | (296)
Income before income taxes and equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 1,030 | 1,086 | 1,103
Income tax expense |  |  |  |  |  |  |  |  | (241) | (429) | (373)
Equity in earnings of equity method investees, net of taxes |  |  |  |  |  |  |  |  | 35 | 39 | 23
Net income | 267 | 175 | 207 | 175 | 167 | 205 | 209 | 115 | 824 | 696 | 753
Less: net income attributable to noncontrolling interests | 13 | 14 | 14 | 11 | 12 | 13 | 14 | 12 | 52 | 51 | 44
Net income attributable to Quest Diagnostics | $ 254 | $ 161 | $ 193 | $ 164 | $ 155 | $ 192 | $ 195 | $ 103 | 772 | 645 | 709
Depreciation and amortization |  |  |  |  |  |  |  |  | 270 | 249 | 304
Total capital expenditures |  |  |  |  |  |  |  |  | 252 | 293 | 263
Routine clinical testing services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 4,309 | 4,179 | 4,078
Gene-based and esoteric (including advanced diagnostics) testing services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 2,449 | 2,335 | 2,256
Anatomic pathology testing services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 612 | 624 | 631
All other services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 339 | 377 | 528
DIS business [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 7,370 | 7,138 | 6,965
Total operating income |  |  |  |  |  |  |  |  | 1,313 | 1,244 | 1,118
Depreciation and amortization |  |  |  |  |  |  |  |  | 189 | 170 | 212
Total capital expenditures |  |  |  |  |  |  |  |  | 219 | 264 | 243
All other operating segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 339 | 377 | 528
Total operating income |  |  |  |  |  |  |  |  | 52 | 64 | 110
Depreciation and amortization |  |  |  |  |  |  |  |  | 6 | 6 | 10
Total capital expenditures |  |  |  |  |  |  |  |  | 15 | 21 | 16
General corporate income (expenses), Net [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | (200) | (31) | 171
Depreciation and amortization |  |  |  |  |  |  |  |  | 75 | 73 | 82
Total capital expenditures |  |  |  |  |  |  |  |  | $ 18 | $ 8 | $ 4

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