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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues | 100.00% | 100.00% | 100.00% | 100.00%
Total net revenues | $ 1,919 | $ 1,864 | $ 3,803 | $ 3,681
Total operating income | 305 | 319 | 577 | 598
Non-operating expenses, net | (41) | (27) | (84) | (60)
Income before income taxes and equity in earnings of equity method investees | 264 | 292 | 493 | 538
Income tax expense | (42) | (94) | (94) | (172)
Equity in earnings of equity method investees, net of taxes | 11 | 9 | 23 | 16
Net income | 233 | 207 | 422 | 382
Less: Net income attributable to noncontrolling interests | 14 | 14 | 26 | 25
Net income attributable to Quest Diagnostics | $ 219 | $ 193 | $ 396 | $ 357
DIS business [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues | 96.00% | 95.00% | 96.00% | 95.00%
Total net revenues | $ 1,835 | $ 1,776 | $ 3,638 | $ 3,506
Total operating income | 341 | 347 | 649 | 653
All other operating segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 84 | 88 | 165 | 175
Total operating income | 11 | 17 | 22 | 30
General corporate activities [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating income | $ (47) | $ (45) | $ (94) | $ (85)

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