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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Calculations of Earnings Per Share | The calculations of earnings per share are as follows:
| Three Months Ended March 31,
($ and shares in millions except per share amounts) | 2018 |  | 2017
Net income attributable to Merck & Co., Inc. | $ | 736 |  |  | $ | 1,551 |
Average common shares outstanding | 2,695 |  |  | 2,745 |
Common shares issuable (1) | 15 |  |  | 21 |
Average common shares outstanding assuming dilution | 2,710 |  |  | 2,766 |
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders | $ | 0.27 |  |  | $ | 0.56 |
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders | $ | 0.27 |  |  | $ | 0.56 |
(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://www.xbrl.org/2003/role/presentationRef -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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