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Earnings per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share The calculations of earnings per share (shares in millions) are as follows:
Years Ended December 31 | 2017 |  | 2016 |  | 2015
Net income attributable to Merck & Co., Inc. | $ | 2,394 |  |  | $ | 3,920 |  |  | $ | 4,442 |
Average common shares outstanding | 2,730 |  |  | 2,766 |  |  | 2,816 |
Common shares issuable (1) | 18 |  |  | 21 |  |  | 25 |
Average common shares outstanding assuming dilution | 2,748 |  |  | 2,787 |  |  | 2,841 |
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders | $ | 0.88 |  |  | $ | 1.42 |  |  | $ | 1.58 |
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders | $ | 0.87 |  |  | $ | 1.41 |  |  | $ | 1.56 |
(1) | Issuable primarily under share-based compensation plans.
In 2017, 2016 and 2015, 5 million, 13 million and 9 million, respectively, of common shares issuable under share-based compensation plans were excluded from the computation of earnings per common share assuming dilution because the effect would have been antidilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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