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Earnings Per Share | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | 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) | 2017 |  | 2016 |  | 2017 |  | 2016
Net income attributable to Merck & Co., Inc. | $ | 1,946 |  |  | $ | 1,205 |  |  | $ | 3,496 |  |  | $ | 2,330 |
Average common shares outstanding | 2,734 |  |  | 2,768 |  |  | 2,739 |  |  | 2,771 |
Common shares issuable (1) | 18 |  |  | 21 |  |  | 20 |  |  | 21 |
Average common shares outstanding assuming dilution | 2,752 |  |  | 2,789 |  |  | 2,759 |  |  | 2,792 |
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders | $ | 0.71 |  |  | $ | 0.44 |  |  | $ | 1.28 |  |  | $ | 0.84 |
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders | $ | 0.71 |  |  | $ | 0.43 |  |  | $ | 1.27 |  |  | $ | 0.83 |
(1) | Issuable primarily under share-based compensation plans.
For the three months ended June 30, 2017 and 2016, 5 million and 13 million, respectively, and for the first six months of 2017 and 2016, 4 million and 12 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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