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Earnings per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share The calculations of earnings per share (shares in millions) are as follows:
Years Ended December 31 | 2020 |  | 2019 |  | 2018
Net income attributable to Merck & Co., Inc. | $ | 7,067 |  |  | $ | 9,843 |  |  | $ | 6,220 |
Average common shares outstanding | 2,530 |  |  | 2,565 |  |  | 2,664 |
Common shares issuable (1) | 11 |  |  | 15 |  |  | 15 |
Average common shares outstanding assuming dilution | 2,541 |  |  | 2,580 |  |  | 2,679 |
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders | $ | 2.79 |  |  | $ | 3.84 |  |  | $ | 2.34 |
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders | $ | 2.78 |  |  | $ | 3.81 |  |  | $ | 2.32 |
(1) Issuable primarily under share-based compensation plans. In 2020, 2019 and 2018, 5 million, 2 million and 6 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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