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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Percentage of net revenues	100.00%	100.00%	100.00%	100.00%
Total net revenues	$ 1,827	$ 1,953	$ 3,649	$ 3,844
Total operating income	283	307	458	555
Non-operating expenses, net	(28)	(42)	(85)	(77)
Income from continuing operations before income taxes and equity in earnings of equity method investees	255	265	373	478
Income tax expense	(66)	(63)	(92)	(113)
Equity in earnings of equity method investees, net of taxes	4	17	18	30
Income (loss) from continuing operations	193	219	299	395
Income from discontinued operations, net of taxes	0	20	0	20
Net income	193	239	299	415
Less: Net income attributable to noncontrolling interests	8	13	15	25
Net income attributable to Quest Diagnostics	$ 185	$ 226	$ 284	$ 390
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues	97.00%	96.00%	96.00%	96.00%
Total net revenues	$ 1,764	$ 1,872	$ 3,508	$ 3,684
Total operating income	$ 280	$ 338	$ 485	$ 618
DIS business | Minimum
Segment Reporting Information [Line Items]
Percentage of net revenues	95.00%	95.00%	95.00%	95.00%
All other operating segments
Segment Reporting Information [Line Items]
Total net revenues	$ 63	$ 81	$ 141	$ 160
Total operating income	4	12	13	21
General corporate activities
Segment Reporting Information [Line Items]
Total operating income	$ (1)	$ (43)	$ (40)	$ (84)

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