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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Percentage of net revenues	100.00%	100.00%	100.00%	100.00%
Total net revenues	$ 1,956	$ 1,889	$ 5,800	$ 5,692
Total operating income	313	304	868	881
Non-operating expenses, net	(43)	(38)	(120)	(122)
Income from continuing operations before income taxes and equity in earnings of equity method investees	270	266	748	759
Income tax expense	(62)	(48)	(175)	(142)
Equity in earnings of equity method investees, net of taxes	18	9	48	32
Income from continuing operations	226	227	621	649
Income from discontinued operations, net of taxes	0	0	20	0
Net income	226	227	641	649
Less: Net income attributable to noncontrolling interests	11	14	36	40
Net income attributable to Quest Diagnostics	$ 215	$ 213	$ 605	$ 609
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues	96.00%	96.00%	96.00%	96.00%
Total net revenues	$ 1,877	$ 1,810	$ 5,561	$ 5,448
Total operating income	$ 345	$ 333	$ 963	$ 982
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	$ 79	$ 79	$ 239	$ 244
Total operating income	10	11	31	33
General corporate activities
Segment Reporting Information [Line Items]
Total operating income	$ (42)	$ (40)	$ (126)	$ (134)

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