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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Percentage of net revenues | 100.00% | 100.00%
Total net revenues | $ 1,822 | $ 1,891
Total operating income | 175 | 248
Non-operating expenses, net | (57) | (35)
Income before income taxes and equity in earnings of equity method investees | 118 | 213
Income tax expense | (26) | (50)
Equity in earnings of equity method investees, net of taxes | 14 | 13
Net income | 106 | 176
Less: Net income attributable to noncontrolling interests | 7 | 12
Net income attributable to Quest Diagnostics | $ 99 | $ 164
DIS business |  |
Segment Reporting Information [Line Items] |  |
Percentage of net revenues | 96.00% | 96.00%
Total net revenues | $ 1,744 | $ 1,812
Total operating income | $ 205 | $ 280
DIS business | Minimum |  |
Segment Reporting Information [Line Items] |  |
Percentage of net revenues | 95.00% | 95.00%
All other operating segments |  |
Segment Reporting Information [Line Items] |  |
Total net revenues | $ 78 | $ 79
Total operating income | 9 | 9
General corporate activities |  |
Segment Reporting Information [Line Items] |  |
Total operating income | $ (39) | $ (41)

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