EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2021		2020
Amounts attributable to Quest Diagnostics’ common stockholders:
Net income attributable to Quest Diagnostics	$	469	$	99
Less: Earnings allocated to participating securities	1		—
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted	$	468	$	99
Weighted average common shares outstanding – basic	133		134
Effect of dilutive securities:
Stock options and performance share units	2		1
Weighted average common shares outstanding – diluted	135		135
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic	$	3.52	$	0.74
Diluted	$	3.46	$	0.73

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 March 31,
	2021	2020
Stock options and performance share units	1	2