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Earnings Per Share (Details) (USD $)
In Millions, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Earnings Per Share    
Common stock outstanding but not included in the calculation of diluted earnings per share (in shares)34.138.440.933.4
Numerators for earnings per common share calculations:    
Income from continuing operations (in dollars)$ 867$ 815$ 2,389$ 2,402
Net loss attributable to noncontrolling interest1132
Income from continuing operations attributable to CVS Caremark ( in dollars )8688162,3922,404
Income (loss) from discontinued operations, net of tax (7)5(3)
Net income attributable to CVS Caremark$ 868$ 809$ 2,397$ 2,401
Denominators for earnings per common share calculations:    
Weighted average common shares, basic (in shares)1,3321,3601,3501,368
Effect of dilutive securities:    
Stock options (in shares)6657
Restricted stock units (in shares)2213
Weighted average common shares, diluted (in shares)1,3401,3681,3561,378
Basic earnings per common share:    
Income from continuing operations attributable to CVS Caremark (in dollars per share)$ 0.65$ 0.60$ 1.77$ 1.76
Income (loss) from discontinued operations attributable to CVS Caremark (in dollars per share) $ (0.01)$ 0.01$ (0.01)
Net income attributable to CVS Caremark (in dollars per share)$ 0.65$ 0.59$ 1.78$ 1.75
Diluted earnings per common share:    
Income from continuing operations attributable to CVS Caremark (in dollars per share)$ 0.65$ 0.60$ 1.76$ 1.75
Income (loss) from discontinued operations attributable to CVS Caremark (in dollars per share) $ (0.01)$ 0.01$ (0.01)
Net income attributable to CVS Caremark (in dollars per share)$ 0.65$ 0.59$ 1.77$ 1.74