EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share, Basic and Diluted [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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Amounts attributable to Quest Diagnostics’ common stockholders:
Net income attributable to Quest Diagnostics	$	631	$	185	$	1,100	$	284
Less: Earnings allocated to participating securities	3		1		4		1
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted	$	628	$	184	$	1,096	$	283
Weighted average common shares outstanding – basic	125		134		129		134
Effect of dilutive securities:
Stock options and performance share units	2		2		2		1
Weighted average common shares outstanding – diluted	127		136		131		135
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic	$	5.05	$	1.38	$	8.52	$	2.12
Diluted	$	4.96	$	1.36	$	8.38	$	2.09

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 June 30,		Six Months Ended June 30,
	2021	2020	2021	2020
Stock options and performance share units	1	1	1	2