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v3.19.3.a.u2

Reinsurance - Narrative (Details) - Subsequent Event | 1 Months Ended
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Jan. 31, 2020 agreement
Subsequent Event [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 Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
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: |