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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues from Diagnostic Information Services business |  |  | 90.00% | 90.00%
Total net revenues | $ 1,885 | $ 1,880 | $ 5,654 | $ 5,644
Total operating income | 322 | 631 | 1,001 | 1,160
Non-operating expenses, net | (33) | (39) | (157) | (263)
Income before income taxes and equity in earnings of equity method investees | 289 | 592 | 844 | 897
Income tax expense | (95) | (239) | (345) | (359)
Equity in earnings of equity method investees, net of taxes | 11 | 1 | 30 | 15
Net income | 205 | 354 | 529 | 553
Less: Net income attributable to noncontrolling interests | 13 | 12 | 39 | 32
Net income attributable to Quest Diagnostics | 192 | 342 | 490 | 521
DIS business [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 1,800 | 1,764 | 5,365 | 5,227
Total operating income | 329 | 294 | 935 | 838
All other operating segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 85 | 116 | 289 | 417
Total operating income | 12 | 30 | 50 | 86
General corporate activities [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating income | $ (19) | $ 307 | $ 16 | $ 236

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