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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 175	$ 115
Other comprehensive income (loss):
Currency translation	4	(3)
Net deferred loss on cash flow hedges, net of taxes	0	1
Other comprehensive income (loss)	4	(2)
Comprehensive income	179	113
Less: Comprehensive income attributable to noncontrolling interests	11	12
Comprehensive income attributable to Quest Diagnostics	$ 168	$ 101

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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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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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