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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Calculations of Earnings Per Share | The calculations of earnings per share (shares in millions) are as follows:
Years Ended December 31 | 2018 |  | 2017 |  | 2016
Net income attributable to Merck & Co., Inc. | $ | 6,220 |  |  | $ | 2,394 |  |  | $ | 3,920 |
Average common shares outstanding | 2,664 |  |  | 2,730 |  |  | 2,766 |
Common shares issuable (1) | 15 |  |  | 18 |  |  | 21 |
Average common shares outstanding assuming dilution | 2,679 |  |  | 2,748 |  |  | 2,787 |
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders | $ | 2.34 |  |  | $ | 0.88 |  |  | $ | 1.42 |
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders | $ | 2.32 |  |  | $ | 0.87 |  |  | $ | 1.41 |
(1) | Issuable primarily under share-based compensation plans.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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