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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 175	$ 205	$ 557	$ 529
Other comprehensive income (loss):
Currency translation	8	(5)	20	(23)
Investment adjustments, net of taxes	3	0	3	(1)
Net deferred loss on cash flow hedges, net of taxes	1	0	1	1
Other comprehensive income (loss)	12	(5)	24	(23)
Comprehensive income	187	200	581	506
Less: Comprehensive income attributable to noncontrolling interests	14	13	39	39
Comprehensive income attributable to Quest Diagnostics	$ 173	$ 187	$ 542	$ 467

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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