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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Amounts attributable to Quest Diagnostics’ common stockholders:
Net income attributable to Quest Diagnostics	$ 469	$ 99
Less: Earnings allocated to participating securities	1	0
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted	$ 468	$ 99
Weighted average common shares outstanding - basic	133	134
Stock options and performance share units	2	1
Weighted average common shares outstanding - diluted	135	135
Basic(in dollars per share)	$ 3.52	$ 0.74
Diluted (in dollars per share)	$ 3.46	$ 0.73
Stock options and performance share units	1	2

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