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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Calculations of Earnings Per Share | The calculations of earnings per share are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
($ and shares in millions except per share amounts) | 2018 |  | 2017 |  | 2018 |  | 2017
Net income attributable to Merck & Co., Inc. | $ | 1,707 |  |  | $ | 1,946 |  |  | $ | 2,443 |  |  | $ | 3,496 |
Average common shares outstanding | 2,683 |  |  | 2,734 |  |  | 2,689 |  |  | 2,739 |
Common shares issuable (1) | 13 |  |  | 18 |  |  | 13 |  |  | 20 |
Average common shares outstanding assuming dilution | 2,696 |  |  | 2,752 |  |  | 2,702 |  |  | 2,759 |
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders | $ | 0.64 |  |  | $ | 0.71 |  |  | $ | 0.91 |  |  | $ | 1.28 |
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders | $ | 0.63 |  |  | $ | 0.71 |  |  | $ | 0.90 |  |  | $ | 1.27 |
(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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