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Significant Accounting Policies - Related Party Transactions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) state | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Related Party Transaction |  |  |
Expenses from transactions with related party | $ 35 | $ 39 | $ 50
Charitable contribution to the CVS foundation |  | 32 |
Equity Method Investee |  |  |
Related Party Transaction |  |  |
Other revenues from transactions with related party | $ 139 | $ 140 | $ 25
Heartland Healthcare Services |  |  |
Related Party Transaction |  |  |
Number of states in which entity operates | state | 4 |  |

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- Definition Charitable Contribution to the CVS Foundation + References No definition available. + Details
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Namespace Prefix: | cvs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | dei_LegalEntityAxis=cvs_HeartlandHealthcareServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |