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Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Antidilutive securities excluded from computation of earnings per share 0.1 8.1
Numerator for earnings per share calculations:    
Net income attributable to CVS Caremark $ 1,129 $ 954
Denominators for earnings per share calculations:    
Weighted averages shares outstanding, basic (in shares) 1,180 1,232
Effect of dilutive securities:    
Stock options (in shares) 8 7
Restricted stock units (in shares) 2 2
Weighted averages shares outstanding, diluted (in shares) 1,190 1,241
Earnings Per Share, Basic $ 0.96 $ 0.77
Earnings Per Share, Diluted $ 0.95 $ 0.77