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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Percentage of net revenues from Diagnostic Information Services business | 90.00% | 90.00%
Total net revenues | $ 1,863 | $ 1,839
Total operating income | 257 | 228
Non-operating expenses, net | (85) | (123)
Income before income taxes and equity in earnings of equity method investees | 172 | 105
Income tax expense | (68) | (42)
Equity in earnings of equity method investees, net of taxes | 10 | 7
Net income | 114 | 70
Less: Net income attributable to noncontrolling interests | 12 | 9
Net income attributable to Quest Diagnostics | 102 | 61
DIS business [Member] |  |
Segment Reporting Information [Line Items] |  |
Total net revenues | 1,756 | 1,692
Total operating income | 278 | 242
All other operating segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Total net revenues | 107 | 147
Total operating income | 21 | 26
General corporate activities [Member] |  |
Segment Reporting Information [Line Items] |  |
Total operating income | $ (42) | $ (40)

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