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Reinsurance - Narrative (Details) - Subsequent Event | 1 Months Ended
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Jan. 31, 2019 agreement
Effects of Reinsurance [Line Items] |
Number of reinsurance contracts entered into | 2
Four years reinsurance agreement with unrelated insurer | 4 years

X
- Definition This line item represents the four years of a reinsurance agreement with an unrelated insurer. + References No definition available. + Details
Name: | cvs_FourYearsReinsuranceAgreementWithUnrelatedInsurer
Namespace Prefix: | cvs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of reinsurance contracts entered into with an unrelated insurer. + References No definition available. + Details
Name: | cvs_NumberofReinsuranceContractsEnteredInto
Namespace Prefix: | cvs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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_EffectsOfReinsuranceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |