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DESCRIPTION OF BUSINESS DESCRIPTION OF BUSINESS (Details) number in Millions	12 Months Ended
	Dec. 31, 2015
Description of Business (Abstract)
Number of requisitions processed during the period	157

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- Definition

Description of Business (Abstract)

+ References

No definition available.

+ Details

Name:	dgx_DescriptionOfBusinessAbstract
Namespace Prefix:	dgx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of requisitions processed during the period.

+ References

No definition available.

+ Details

Name:	dgx_Numberofrequisitionsprocessedduringtheperiod
Namespace Prefix:	dgx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration