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Earnings per Share | 12 Months Ended
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Dec. 31, 2021
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 | 2021 |  | 2020 |  | 2019
Net Income from Continuing Operations Attributable to Merck & Co., Inc. | $ | 12,345 |  |  | $ | 4,519 |  |  | $ | 5,690 |
Income from Discontinued Operations, Net of Taxes and Amounts Attributable to Noncontrolling Interests | 704 |  |  | 2,548 |  |  | 4,153 |
Net income attributable to Merck & Co., Inc. | $ | 13,049 |  |  | $ | 7,067 |  |  | $ | 9,843 |
Average common shares outstanding | 2,530 |  |  | 2,530 |  |  | 2,565 |
Common shares issuable (1) | 8 |  |  | 11 |  |  | 15 |
Average common shares outstanding assuming dilution | 2,538 |  |  | 2,541 |  |  | 2,580 |
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders: |  |  |  |  |
Income from Continuing Operations | $ | 4.88 |  |  | $ | 1.79 |  |  | $ | 2.22 |
Income from Discontinued Operations | 0.28 |  |  | 1.01 |  |  | 1.62 |
Net Income | $ | 5.16 |  |  | $ | 2.79 |  |  | $ | 3.84 |
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders: |  |  |  |  |
Income from Continuing Operations | $ | 4.86 |  |  | $ | 1.78 |  |  | $ | 2.21 |
Income from Discontinued Operations | 0.28 |  |  | 1.00 |  |  | 1.61 |
Net Income | $ | 5.14 |  |  | $ | 2.78 |  |  | $ | 3.81 |
(1) Issuable primarily under share-based compensation plans. In 2021, 2020 and 2019, 9 million, 5 million and 2 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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