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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Percentage of net revenues from Diagnostic Information Services business | 90.00% | 90.00%
Total net revenues | $ 1,899 | $ 1,863
Total operating income | 279 | 257
Non-operating expenses, net | (33) | (85)
Income before income taxes and equity in earnings of equity method investees | 246 | 172
Income tax expense | (78) | (67)
Equity in earnings of equity method investees, net of taxes | 7 | 10
Net income | 175 | 115
Less: Net income attributable to noncontrolling interests | 11 | 12
Net income attributable to Quest Diagnostics | 164 | 103
DIS business [Member] |  |
Segment Reporting Information [Line Items] |  |
Total net revenues | 1,812 | 1,756
Total operating income | 306 | 278
All other operating segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Total net revenues | 87 | 107
Total operating income | 13 | 21
General corporate activities [Member] |  |
Segment Reporting Information [Line Items] |  |
Total operating income | $ (40) | $ (42)

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