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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Income from continuing operations	$ 215	$ 213	$ 585	$ 609
Income from discontinued operations, net of taxes	0	0	20	0
Net income attributable to Quest Diagnostics	215	213	605	609
Less: Earnings allocated to participating securities	1	1	2	2
Earnings available to Quest Diagnostics' common stockholders - basic and diluted	$ 214	$ 212	$ 583	$ 607
Weighted average common shares outstanding - basic	135	136	135	136
Stock options and performance share units	2	3	1	3
Weighted average common shares outstanding - diluted	137	139	136	139
Income from continuing operations (in dollars per share)	$ 1.59	$ 1.56	$ 4.33	$ 4.46
Income from discontinued operations (in dollars per share)	0	0	0.15	0
Net income (in dollars per share)	1.59	1.56	4.48	4.46
Income from continuing operations (in dollars per share)	1.56	1.53	4.27	4.37
Income from discontinued operations (in dollars per share)	0	0	0.15	0
Net income (in dollars per share)	$ 1.56	$ 1.53	$ 4.42	$ 4.37
Stock options and performance share units not included due to their antidilutive effect	2	2	3	2

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