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Earnings per Share (Details) (USD $)
In Millions, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Basic Earnings per Common Share    
Net income attributable to Merck & Co., Inc.$ 1,692$ 342$ 4,760$ 1,393
Less: Income allocated to participating securities32126
Net income allocated to common shareholders1,6893404,7481,387
Average common shares outstanding3,0703,0783,0793,099
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders$ 0.55$ 0.11$ 1.54$ 0.45
Earnings per Common Share Assuming Dilution    
Net income attributable to Merck & Co., Inc.1,6923424,7601,393
Less: Income allocated to participating securities32126
Net income allocated to common shareholders$ 1,689$ 340$ 4,748$ 1,387
Average common shares outstanding3,0703,0783,0793,099
Common shares issuable21242324
Average common shares outstanding assuming dilution3,0913,1023,1023,123
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders$ 0.55$ 0.11$ 1.53$ 0.44