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Significant Accounting Policies - Contract Balances (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Change in Contract with Customer, Liability [Roll Forward] |  |
Contract liabilities (included in accrued expenses) beginning balance | $ 73 | $ 67
Rewards earnings and gift card issuances | 266 | 269
Redemption and breakage | (264) | (264)
Contract liabilities (included in accrued expenses) ending balance | $ 75 | $ 72

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- Definition Change in Contract with Customer, Liability [Roll Forward] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in contract liability recognized for loyalty program earnings and gift card issuance. + 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 Contract with Customer Liability Redemption and Breakage + References No definition available. + Details
Name: | cvs_ContractwithCustomerLiabilityRedemptionandBreakage
Namespace Prefix: | cvs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant