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Significant Accounting Policies Significant Accounting Policies (Details 7) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Discontinued operation disclosures                      
Discontinued Operation, Tax Effect of Discontinued Operation                 $ 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ (4)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ (5)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest (1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (7)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Antidilutive securities excluded from computation of earnings per share                 2.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 6.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5.9us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Linens N Things                      
Discontinued operation disclosures                      
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax                 $ (1)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= cvs_LinensNThingsMember
$ (12)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= cvs_LinensNThingsMember
$ (12)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= cvs_LinensNThingsMember