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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 1,499	$ 906	$ 788
Other comprehensive income (loss):
Foreign currency translation adjustment	15	7	(11)
Net change in available-for-sale debt securities, net of taxes	0	8	0
Net deferred gain on cash flow hedges, net of taxes	3	5	2
Other comprehensive income (loss)	18	20	(9)
Comprehensive income	1,517	926	779
Less: Comprehensive income attributable to noncontrolling interests	68	48	52
Comprehensive income attributable to Quest Diagnostics	$ 1,449	$ 878	$ 727

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