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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Percentage of net revenues from Diagnostic Information Services business |  |  | 90.00% | 90.00%
Total net revenues | $ 1,880 | $ 1,904 | $ 5,644 | $ 5,552
Total operating income | 631 | 256 | 1,160 | 726
Non-operating expenses, net | (39) | (42) | (263) | (119)
Income before income taxes and equity in earnings of equity method investees | 592 | 214 | 897 | 607
Income tax expense | (239) | (82) | (359) | (234)
Equity in earnings of equity method investees, net of taxes | 1 | 7 | 15 | 19
Net income | 354 | 139 | 553 | 392
Less: Net income attributable to noncontrolling interests | 12 | 10 | 32 | 26
Net income attributable to Quest Diagnostics | 342 | 129 | 521 | 366
DIS business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 1,764 | 1,765 | 5,227 | 5,141
Total operating income | 294 | 281 | 838 | 805
All other operating segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 116 | 139 | 417 | 411
Total operating income | 30 | 23 | 86 | 63
General corporate activities [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating income | $ 307 | $ (48) | $ 236 | $ (142)

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