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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 490	$ 106
Other comprehensive loss:
Foreign currency translation adjustment	(3)	(19)
Net change in available-for-sale debt securities, net of taxes	(7)	0
Other comprehensive loss	(10)	(19)
Comprehensive income	480	87
Less: Comprehensive income attributable to noncontrolling interests	21	7
Comprehensive income attributable to Quest Diagnostics	$ 459	$ 80

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