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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Percentage of net revenues from the DIS business	100.00%	100.00%	100.00%
Total net revenues	$ 9,883	$ 10,788	$ 9,437
Total operating income	1,428	2,381	1,971
Non-operating expenses, net	(193)	218	(87)
Income before income taxes and equity in earnings of equity method investees	1,235	2,599	1,884
Income tax expense	(264)	(597)	(460)
Equity in earnings of equity method investees, net of taxes	44	78	75
Net income	1,015	2,080	1,499
Less: net income attributable to noncontrolling interests	69	85	68
Net income attributable to Quest Diagnostics	946	1,995	1,431
Depreciation and amortization	437	408	361
Total capital expenditures	$ 404	$ 403	$ 418
Total net revenues, percent	100.00%	100.00%	100.00%
Routine clinical testing and other services
Segment Reporting Information [Line Items]
Total net revenues, percent	44.00%	40.00%	41.00%
COVID-19 testing services
Segment Reporting Information [Line Items]
Total net revenues, percent	15.00%	26.00%	29.00%
Gene-based and esoteric (including advanced diagnostics) testing services
Segment Reporting Information [Line Items]
Total net revenues, percent	32.00%	26.00%	22.00%
Anatomic pathology testing services
Segment Reporting Information [Line Items]
Total net revenues, percent	6.00%	5.00%	5.00%
All other services
Segment Reporting Information [Line Items]
Total net revenues, percent	3.00%	3.00%	3.00%
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues from the DIS business	97.00%	97.00%	97.00%
Total net revenues	$ 9,609	$ 10,494	$ 9,139
Total operating income	1,704	2,646	2,201
Depreciation and amortization	305	294	249
Total capital expenditures	384	379	394
All other operating segments
Segment Reporting Information [Line Items]
Total net revenues	274	294	298
Total operating income	20	29	39
Depreciation and amortization	12	10	8
Total capital expenditures	19	14	15
General corporate income (expenses), Net
Segment Reporting Information [Line Items]
Total operating income	(296)	(294)	(269)
Depreciation and amortization	120	104	104
Total capital expenditures	$ 1	$ 10	$ 9
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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