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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of net revenues from the DIS business |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Total net revenues | $ 3,002 | $ 2,786 | $ 1,827 | $ 1,822 | $ 1,926 | $ 1,956 | $ 1,953 | $ 1,891 | $ 9,437 | $ 7,726 | $ 7,531
Total operating income |  |  |  |  |  |  |  |  | 1,971 | 1,231 | 1,101
Non-operating expenses, net |  |  |  |  |  |  |  |  | (87) | (155) | (175)
Income from continuing operations before income taxes and equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 1,884 | 1,076 | 926
Income tax expense |  |  |  |  |  |  |  |  | (460) | (247) | (182)
Equity in earnings of equity method investees, net of taxes |  |  |  |  |  |  |  |  | 75 | 57 | 44
Income from continuing operations | 609 | 591 | 193 | 106 | 265 | 226 | 219 | 176 | 1,499 | 886 | 788
Income (loss) from discontinued operations, net of taxes | 0 | 0 | 0 | 0 | 0 | 0 | 20 | 0 | 0 | 20 | 0
Net income | 609 | 591 | 193 | 106 | 265 | 226 | 239 | 176 | 1,499 | 906 | 788
Less: net income attributable to noncontrolling interests | 30 | 23 | 8 | 7 | 12 | 11 | 13 | 12 | 68 | 48 | 52
Net income attributable to Quest Diagnostics | $ 579 | $ 568 | $ 185 | $ 99 | $ 253 | $ 215 | $ 226 | $ 164 | 1,431 | 858 | 736
Depreciation and amortization |  |  |  |  |  |  |  |  | 361 | 329 | 309
Total capital expenditures |  |  |  |  |  |  |  |  | 418 | 400 | 383
Routine clinical testing services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 3,836 | 4,206 | 4,217
COVID-19 testing services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 2,723 | 0 | 0
Gene-based and esoteric (including advanced diagnostics) testing services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 2,098 | 2,620 | 2,409
Anatomic pathology testing services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 482 | 579 | 578
All other services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | $ 298 | $ 321 | $ 327
DIS business |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of net revenues from the DIS business |  |  |  |  |  |  |  |  | 97.00% | 96.00% | 96.00%
Total net revenues |  |  |  |  |  |  |  |  | $ 9,139 | $ 7,405 | $ 7,204
Total operating income |  |  |  |  |  |  |  |  | 2,201 | 1,298 | 1,235
Depreciation and amortization |  |  |  |  |  |  |  |  | 249 | 226 | 213
Total capital expenditures |  |  |  |  |  |  |  |  | 394 | 373 | 330
All other operating segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 298 | 321 | 327
Total operating income |  |  |  |  |  |  |  |  | 39 | 42 | 47
Depreciation and amortization |  |  |  |  |  |  |  |  | 8 | 6 | 6
Total capital expenditures |  |  |  |  |  |  |  |  | 15 | 20 | 16
General corporate income (expenses), Net |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | (269) | (109) | (181)
Depreciation and amortization |  |  |  |  |  |  |  |  | 104 | 97 | 90
Total capital expenditures |  |  |  |  |  |  |  |  | $ 9 | $ 7 | $ 37
Minimum | DIS business |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of net revenues from the DIS business |  |  |  |  |  |  |  |  | 95.00% | 95.00% | 95.00%

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