CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 142	$ 174	$ 253	$ 318
Other comprehensive income (loss):
Currency translation	3	(26)	2	(30)
Market valuation, net of tax	3	0	3	0
Net deferred loss on cash flow hedges, net of tax	(3)	0	(5)	0
Other, net of tax	0	(3)	0	(3)
Other comprehensive income (loss)	3	(23)	0	(27)
Comprehensive income	145	151	253	291
Less: Comprehensive income attributable to noncontrolling interests	9	9	16	17
Comprehensive income attributable to Quest Diagnostics	$ 136	$ 142	$ 237	$ 274