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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues | 100.00% | 100.00% | 100.00% | 100.00%
Total net revenues | $ 1,889 | $ 1,856 | $ 5,692 | $ 5,537
Total operating income | 304 | 298 | 881 | 896
Non-operating expenses, net | (38) | (40) | (122) | (100)
Income before income taxes and equity in earnings of equity method investees | 266 | 258 | 759 | 796
Income tax expense | (48) | (92) | (142) | (264)
Equity in earnings of equity method investees, net of taxes | 9 | 9 | 32 | 25
Net income | 227 | 175 | 649 | 557
Less: Net income attributable to noncontrolling interests | 14 | 14 | 40 | 39
Net income attributable to Quest Diagnostics | $ 213 | $ 161 | $ 609 | $ 518
DIS business [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues | 96.00% | 96.00% | 96.00% | 95.40%
Total net revenues | $ 1,810 | $ 1,777 | $ 5,448 | $ 5,283
Total operating income | 333 | 334 | 982 | 987
All other operating segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 79 | 79 | 244 | 254
Total operating income | 11 | 10 | 33 | 40
General corporate activities [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating income | $ (40) | $ (46) | $ (134) | $ (131)

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