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BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Percentage of net revenues	100.00%	100.00%	100.00%	100.00%
Total net revenues	$ 2,816	$ 2,488	$ 8,229	$ 7,251
Segment operating income	386	330	1,170	985
Non-operating expense, net	(58)	(34)	(182)	(109)
Income before income taxes and equity in earnings of equity method investees	328	296	988	876
Income tax expense	(77)	(65)	(233)	(205)
Equity in earnings of equity method investees, net of taxes	8	6	35	14
Net income	259	237	790	685
Less: Net income attributable to noncontrolling interests	14	11	43	36
Net income attributable to Quest Diagnostics	245	226	747	649
Depreciation and amortization	$ 142	$ 125	$ 425	$ 358
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues	98.00%	97.00%	98.00%	97.00%
Total net revenues	$ 2,755	$ 2,427	$ 8,043	$ 7,058
Less: Other segment items	2,273	2,020	6,653	5,858
Segment operating income	482	407	1,390	1,200
Depreciation and amortization	99	90	296	258
All other operating segments
Segment Reporting Information [Line Items]
Total net revenues	61	61	186	193
Segment operating income	9	6	24	23
Depreciation and amortization	3	3	10	9
General corporate activities
Segment Reporting Information [Line Items]
Segment operating income	(105)	(83)	(244)	(238)
Depreciation and amortization	$ 40	$ 32	$ 119	$ 91
Minimum | DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues	97.00%	97.00%	97.00%	97.00%

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