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Earnings Per Share | 6 Months Ended
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Jun. 30, 2019
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) | 2019 |  | 2018 |  | 2019 |  | 2018
Net income attributable to Merck & Co., Inc. | $ | 2,670 |  |  | $ | 1,707 |  |  | $ | 5,585 |  |  | $ | 2,443 |
Average common shares outstanding | 2,574 |  |  | 2,683 |  |  | 2,579 |  |  | 2,689 |
Common shares issuable (1) | 14 |  |  | 13 |  |  | 17 |  |  | 13 |
Average common shares outstanding assuming dilution | 2,588 |  |  | 2,696 |  |  | 2,596 |  |  | 2,702 |
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders | $ | 1.04 |  |  | $ | 0.64 |  |  | $ | 2.17 |  |  | $ | 0.91 |
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders | $ | 1.03 |  |  | $ | 0.63 |  |  | $ | 2.15 |  |  | $ | 0.90 |
(1) | Issuable primarily under share-based compensation plans.
For the second quarter of 2019 and 2018, 3 million and 13 million, respectively, and for the first six months of 2019 and 2018, 4 million and 15 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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