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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues from Diagnostic Information Services business |  |  | 90.00% | 90.00%
Total net revenues | $ 1,931 | $ 1,885 | $ 5,773 | $ 5,654
Total operating income | 298 | 322 | 896 | 1,001
Non-operating expenses, net | (40) | (33) | (100) | (157)
Income before income taxes and equity in earnings of equity method investees | 258 | 289 | 796 | 844
Income tax expense | (92) | (95) | (264) | (345)
Equity in earnings of equity method investees, net of taxes | 9 | 11 | 25 | 30
Net income | 175 | 205 | 557 | 529
Less: Net income attributable to noncontrolling interests | 14 | 13 | 39 | 39
Net income attributable to Quest Diagnostics | 161 | 192 | 518 | 490
DIS business [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 1,850 | 1,800 | 5,517 | 5,365
Total operating income | 334 | 329 | 987 | 935
All other operating segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 81 | 85 | 256 | 289
Total operating income | 10 | 12 | 40 | 50
General corporate activities [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating income | $ (46) | $ (19) | $ (131) | $ 16

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