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DESCRIPTION OF BUSINESS DESCRIPTION OF BUSINESS (Details) number in Millions | 12 Months Ended
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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
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Namespace Prefix: | dgx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of requisitions processed during the period. + References No definition available. + Details
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Namespace Prefix: | dgx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration