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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Income from continuing operations	$ 206	$ 219	$ 370	$ 396
Income from discontinued operations, net of taxes	20	0	20	0
Net income attributable to Quest Diagnostics	226	219	390	396
Less: Earnings allocated to participating securities	0	0	1	1
Earnings available to Quest Diagnostics' common stockholders - basic and diluted	$ 206	$ 219	$ 369	$ 395
Weighted average common shares outstanding - basic	135	136	134	136
Stock options and performance share units	1	3	2	3
Weighted average common shares outstanding - diluted	136	139	136	139
Income from continuing operations (in dollars per share)	$ 1.52	$ 1.60	$ 2.74	$ 2.90
Income from discontinued operations (in dollars per share)	0.15	0	0.15	0
Net income (in dollars per share)	1.67	1.60	2.89	2.90
Income from continuing operations (in dollars per share)	1.51	1.57	2.71	2.84
Income from discontinued operations (in dollars per share)	0.15	0	0.15	0
Net income (in dollars per share)	$ 1.66	$ 1.57	$ 2.86	$ 2.84
Stock options and performance share units not included due to their antidilutive effect	5	2	5	2

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