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Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, 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
Earnings Per Share [Abstract]                      
Participating Securities, Distributed and Undistributed Earnings                 $ 19us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarnings    
Numerator for earnings per common share calculation:                      
Income from continuing operations attributable to common stockholders(1)                 $ 4,626us-gaap_IncomeLossFromContinuingOperations [1] $ 4,600us-gaap_IncomeLossFromContinuingOperations [1] $ 3,871us-gaap_IncomeLossFromContinuingOperations [1]
Denominator for earnings per share calculation:                      
Weighted average shares, basic                 1,161us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 1,217us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 1,271us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock options (in shares)                 8us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 9us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 9us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares, diluted                 1,169us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 1,226us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 1,280us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share:                      
Income from continuing operations attributable to CVS Caremark (in dollars per share) $ 1.15us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.82us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.07us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.96us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.03us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.92us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.77us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 3.98us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 3.78us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 3.05us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted earnings per share:                      
Income from continuing operations attributable to CVS Caremark (in dollars per share) $ 1.14us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.81us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.06us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.95us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.05us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.02us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.91us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.77us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 3.96us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 3.75us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 3.02us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
[1] Comprised of income from continuing operations less amounts allocable to participating securities of $19 million for the year ended December 31, 2014.