EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Amounts attributable to Quest Diagnostics’ common stockholders:
Net income attributable to Quest Diagnostics	$	505	$	568	$	1,605	$	852
Less: Earnings allocated to participating securities	2		2		6		3
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted	$	503	$	566	$	1,599	$	849
Weighted average common shares outstanding – basic	123		135		127		134
Effect of dilutive securities:
Stock options and performance share units	2		2		2		2
Weighted average common shares outstanding – diluted	125		137		129		136
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic	$	4.11	$	4.20	$	12.63	$	6.33
Diluted	$	4.02	$	4.14	$	12.41	$	6.25

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,
	2021	2020	2021	2020
Stock options and performance share units	—	1	—	1