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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 239	$ 233	$ 415	$ 422
Other comprehensive income:
Currency translation	(4)	(14)	0	(8)
Net deferred loss on cash flow hedges, net of taxes	1	0	1	1
Other comprehensive (loss) income	(3)	(14)	1	(7)
Comprehensive income	236	219	416	415
Less: Comprehensive income attributable to noncontrolling interests	13	14	25	26
Comprehensive income attributable to Quest Diagnostics	$ 223	$ 205	$ 391	$ 389

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