EARNINGS (LOSS) PER SHARE (Tables)

12 Months Ended

Dec. 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 is as follows (in millions, except per share data):

	2021		2020		2019
Amounts attributable to Quest Diagnostics’ common stockholders:
Income from continuing operations	$	1,995	$	1,431	$	838
Income from discontinued operations, net of taxes	—		—		20
Net income attributable to Quest Diagnostics' common stockholders	$	1,995	$	1,431	$	858
Income from continuing operations	$	1,995	$	1,431	$	838
Less: Earnings allocated to participating securities	7		6		3
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted	$	1,988	$	1,425	$	835
Weighted average common shares outstanding – basic	125		134		134
Effect of dilutive securities:
Stock options and performance share units	3		2		2
Weighted average common shares outstanding – diluted	128		136		136
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic:
Income from continuing operations	$	15.85	$	10.62	$	6.21
Income from discontinued operations	—		—		0.15
Net income	$	15.85	$	10.62	$	6.36
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted:
Income from continuing operations	$	15.55	$	10.47	$	6.13
Income from discontinued operations	—		—		0.15
Net income	$	15.55	$	10.47	$	6.28

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:

	2021	2020	2019
Stock options and performance share units	—	1	3