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EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2025

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The computation of basic and diluted earnings per common share was as follows (in millions, except per share data):

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Amounts attributable to Quest Diagnostics’ common stockholders:
Net income attributable to Quest Diagnostics			$	245					$	226					$	747					$	649
Less: Earnings allocated to participating securities			2						1						4						3
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted			$	243					$	225					$	743					$	646
Weighted average common shares outstanding – basic			112						112						112						111
Effect of dilutive securities:
Stock options and performance share units			1						1						1						1
Weighted average common shares outstanding – diluted			113						113						113						112
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic			$	2.18					$	2.01					$	6.66					$	5.80
Diluted			$	2.16					$	1.99					$	6.57					$	5.74

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Stock options and performance share units			—						—						—						1

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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