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SUPPLEMENTAL CASH FLOW & OTHER DATA (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Supplemental Cash Flow and Other Data [Line Items] |  |
Operating lease right-of-use assets | $ 620 | $ 597
Amended Real Estate Lease |  |
Supplemental Cash Flow and Other Data [Line Items] |  |
Operating lease right-of-use assets | $ 31 |

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- Definition [Line Items] for Supplemental Cash Flow and Other Data [Table] + 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 Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |