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Acquisitions, Divestitures, Research Collaborations and License Agreements - Pro Forma Financial Information (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares
Business Combinations [Abstract] |
Sales | $ | $ 39,584
Net income attributable to Merck & Co., Inc. | $ | $ 4,640
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders (in dollars per share) | $ / shares | $ 1.65
Earnings per common share assuming dilution attributable to Merck & Co. Inc. common shareholders (in dollars per share) | $ / shares | $ 1.63

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