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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Calculations of Earnings Per Share | The calculations of earnings per share are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
($ and shares in millions except per share amounts) | 2017 |  | 2016 |  | 2017 |  | 2016
Net (loss) income attributable to Merck & Co., Inc. | $ | (56 | ) |  | $ | 2,184 |  |  | $ | 3,440 |  |  | $ | 4,515 |
Average common shares outstanding | 2,727 |  |  | 2,765 |  |  | 2,735 |  |  | 2,769 |
Common shares issuable (1) | — |  |  | 21 |  |  | 19 |  |  | 22 |
Average common shares outstanding assuming dilution | 2,727 |  |  | 2,786 |  |  | 2,754 |  |  | 2,791 |
Basic (loss) earnings per common share attributable to Merck & Co., Inc. common shareholders | $ | (0.02 | ) |  | $ | 0.79 |  |  | $ | 1.26 |  |  | $ | 1.63 |
(Loss) earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders | $ | (0.02 | ) |  | $ | 0.78 |  |  | $ | 1.25 |  |  | $ | 1.62 |
(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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