BUSINESS SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table is a summary of segment information for the years ended December 31, 2024, 2023 and 2022. Segment asset information is not presented since it is not received by the CODM at the operating segment level. The CODM regularly reviews certain consolidated expenses, including employee compensation costs. "Other segment items" principally consist of costs for obtaining, transporting and testing specimens, facility costs used for the delivery of the Company's services, costs associated with the Company's sales and marketing efforts, and costs related to billing operations. Operating income (loss) of each segment represents net revenues less directly identifiable expenses. General corporate activities included in the table below are comprised of general management and administrative corporate expenses, amortization and impairment of intangibles assets and other operating income and expenses, net of certain general corporate activity costs that are allocated to the DIS and DS businesses. The accounting policies of the segments are the same as those of the Company as set forth in Note 2.

	2024
	DIS		Total
Net revenues	$	9,614	$	9,614
DS revenues			258
Total net revenues			$	9,872
Less: Other segment items	(7,984)
Segment operating income	$	1,630	$	1,630
DS operating income			33
General corporate activities			(317)
Total operating income			1,346
Non-operating expense, net			(171)
Income before income taxes and equity in earnings of equity method investees			1,175
Income tax expense			(273)
Equity in earnings of equity method investees, net of taxes			19
Net income			921
Less: Net income attributable to noncontrolling interests			50
Net income attributable to Quest Diagnostics			$	871

	2023
	DIS		Total
Net revenues	$	8,976	$	8,976
DS revenues			276
Total net revenues			$	9,252
Less: Other segment items	(7,429)
Segment operating income	$	1,547	$	1,547
DS operating income			34
General corporate activities			(319)
Total operating income			1,262
Non-operating expense, net			(132)
Income before income taxes and equity in earnings of equity method investees			1,130
Income tax expense			(248)
Equity in earnings of equity method investees, net of taxes			26
Net income			908
Less: Net income attributable to noncontrolling interests			54
Net income attributable to Quest Diagnostics			$	854

	2022
	DIS		Total
Net revenues	$	9,609	$	9,609
DS revenues			274
Total net revenues			$	9,883
Less: Other segment items	(7,905)
Segment operating income	$	1,704	$	1,704
DS operating income			20
General corporate activities			(296)
Total operating income			1,428
Non-operating expense, net			(193)
Income before income taxes and equity in earnings of equity method investees			1,235
Income tax expense			(264)
Equity in earnings of equity method investees, net of taxes			44
Net income			1,015
Less: Net income attributable to noncontrolling interests			69
Net income attributable to Quest Diagnostics			$	946

    Depreciation and amortization expense for the years ended December 31, 2024, 2023 and 2022 were as follows:

	2024		2023		2022
DIS business	$	352	$	319	$	305
All other operating segments	13		11		12
General corporate	128		109		120
Total depreciation and amortization	$	493	$	439	$	437

    Capital expenditures for the years ended December 31, 2024, 2023 and 2022 were as follows:

	2024		2023		2022
DIS business	$	410	$	398	$	384
All other operating segments	7		8		19
General corporate	8		2		1
Total capital expenditures	$	425	$	408	$	404

Schedule of Percentage of Net Revenues by Customer Major Service

The approximate percentage of net revenues by major service for the years ended December 31, 2024, 2023 and 2022 was as follows:

	2024		2023		2022
Routine clinical testing and other services	51	%	51	%	44	%
COVID-19 testing services	1		2		15
Gene-based and esoteric (including advanced diagnostics) testing services	39		38		32
Anatomic pathology testing services	6		6		6
All other	3		3		3
Net revenues	100	%	100	%	100	%

Schedule of Net Revenues by Customer Channel

The approximate percentage of net revenues by customer channel for the years ended December 31, 2024, 2023 and 2022 was as follows:

	2024		2023		2022
Physician lab services	68	%	66	%	68	%
Hospital lab services	20		21		18
Other DIS	9		10		11
Total DIS revenues	97		97		97
DS revenues	3		3		3
Total net revenues	100	%	100	%	100	%