v3.25.2

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Amounts attributable to Quest Diagnostics’ common stockholders:
Net income attributable to Quest Diagnostics	$ 282	$ 229	$ 502	$ 423
Less: Earnings allocated to participating securities	1	1	2	2
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted	$ 281	$ 228	$ 500	$ 421
Weighted average common shares outstanding - basic	112	111	112	111
Stock options and performance share units	1	1	1	1
Weighted average common shares outstanding - diluted	113	112	113	112
Basic (in dollars per share)	$ 2.51	$ 2.05	$ 4.48	$ 3.79
Diluted (in dollars per share)	$ 2.47	$ 2.03	$ 4.41	$ 3.75
Stock options and performance share units (in shares)	0	1	0	1

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

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