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Accounting Policies - Description of Business (Details) | 9 Months Ended
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Sep. 30, 2018 state segment clinic pharmacy item store Center
Segment reporting information |
Number of reportable segments | segment | 3
Pharmacy Services Segment |
Segment reporting information |
Number of pharmacies | 68,000
Number of chain pharmacies | 41,000
Number of independent pharmacies | 27,000
Number of conditions for integrated disease management | item | 19
Centers of excellence for infusion and enteral services | Center | 3
Number of states pharmacies operated | state | 42
Pharmacy Services Segment | Specialty stores |
Segment reporting information |
Number of pharmacies | 25
Pharmacy Services Segment | Specialty mail order |
Segment reporting information |
Number of pharmacies | 17
Pharmacy Services Segment | Mail service |
Segment reporting information |
Number of pharmacies | 4
Pharmacy Services Segment | Infusion and Enteral Branches |
Segment reporting information |
Number of infusion and enteral branches | 86
Pharmacy Services Segment | Ambulatory Infusion Suites |
Segment reporting information |
Number of infusion and enteral branches | 68
Retail/LTC Segment |
Segment reporting information |
Number of states pharmacies operated | state | 49
Number of drugstores | store | 9,905
Number of on-site pharmacies | 37
Number of LTC spoke pharmacies | store | 155
Number of LTC hub pharmacies | store | 30
Retail/LTC Segment | MinuteClinic |
Segment reporting information |
Number of drugstores | clinic | 1,102
Retail/LTC Segment | Minute Clinic Within C V S Pharmacy Stores |
Segment reporting information |
Number of drugstores | clinic | 1,098
Retail/LTC Segment | Pharmacy |
Segment reporting information |
Number of drugstores | store | 8,149
Target Pharmacy Acquisition | Retail/LTC Segment |
Segment reporting information |
Number of pharmacies acquired | 1,709

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- Definition Centers of Excellence for Infusion and Enteral Services + References No definition available. + Details
Name: | cvs_CentersofExcellenceforInfusionandEnteralServices
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the number of conditions for which integrated disease management is available under the entity's rare disease management programs. + References No definition available. + Details
Name: | cvs_NumberOfConditionsForIntegratedDiseaseManagement
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of drugstores operated by the entity. + References No definition available. + Details
Name: | cvs_NumberOfDrugstores
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of on-site pharmacies. + References No definition available. + Details
Name: | cvs_NumberOfOnsitePharmacies
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of pharmacies through which the reporting entity supplies pharmaceuticals. + References No definition available. + Details
Name: | cvs_NumberOfPharmacies
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of chain pharmacies through which the reporting entity supplies pharmaceuticals. + References No definition available. + Details
Name: | cvs_NumberofChainPharmacies
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of independent pharmacies through which the reporting entity supplies pharmaceuticals. + References No definition available. + Details
Name: | cvs_NumberofIndependentPharmacies
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Infusion and Enteral Branches + References No definition available. + Details
Name: | cvs_NumberofInfusionandEnteralBranches
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of LTC hub pharmacies + References No definition available. + Details
Name: | cvs_NumberofLTChubpharmacies
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of LTC spoke pharmacies + References No definition available. + Details
Name: | cvs_NumberofLTCspokepharmacies
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Pharmacies Acquired + References No definition available. + Details
Name: | cvs_NumberofPharmaciesAcquired
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cvs_PharmacyServicesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsegmentsAxis=cvs_SpecialtyStoresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsegmentsAxis=cvs_SpecialtyMailOrderMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsegmentsAxis=cvs_MailServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsegmentsAxis=cvs_InfusionandEnteralBranchesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsegmentsAxis=cvs_AmbulatoryinfusionsuitesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cvs_RetailLTCSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=cvs_MinuteClinicMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=cvs_MinuteClinicWithinCVSPharmacyStoresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsegmentsAxis=cvs_PharmacyAndOnlineWebsiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=cvs_TargetPharmacyAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |