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Earnings Per Share | 6 Months Ended
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Jun. 30, 2021
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) | 2021 |  | 2020 |  | 2021 |  | 2020
Net Income from Continuing Operations Attributable to Merck & Co., Inc. | $ | 1,213 |  |  | $ | 2,341 |  |  | $ | 3,958 |  |  | $ | 4,812 |
Income from Discontinued Operations, Net of Taxes and Amounts Attributable to Noncontrolling Interests | 332 |  |  | 661 |  |  | 766 |  |  | 1,409 |
Net Income Attributable to Merck & Co., Inc. | $ | 1,545 |  |  | $ | 3,002 |  |  | $ | 4,724 |  |  | $ | 6,221 |
Average common shares outstanding | 2,533 |  |  | 2,527 |  |  | 2,532 |  |  | 2,531 |
Common shares issuable (1) | 7 |  |  | 9 |  |  | 8 |  |  | 11 |
Average common shares outstanding assuming dilution | 2,540 |  |  | 2,536 |  |  | 2,540 |  |  | 2,542 |
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders: |  |  |  |  |  |  |
Income from Continuing Operations | $ | 0.48 |  |  | $ | 0.93 |  |  | $ | 1.56 |  |  | $ | 1.90 |
Income from Discontinued Operations | 0.13 |  |  | 0.26 |  |  | 0.30 |  |  | 0.56 |
Net Income | $ | 0.61 |  |  | $ | 1.19 |  |  | $ | 1.87 |  |  | $ | 2.46 |
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders: |  |  |  |  |  |  |
Income from Continuing Operations | $ | 0.48 |  |  | $ | 0.92 |  |  | $ | 1.56 |  |  | $ | 1.89 |
Income from Discontinued Operations | 0.13 |  |  | 0.26 |  |  | 0.30 |  |  | 0.55 |
Net Income | $ | 0.61 |  |  | $ | 1.18 |  |  | $ | 1.86 |  |  | $ | 2.45 |
(1)Issuable primarily under share-based compensation plans. For the second quarter of 2021 and 2020, 12 million and 8 million, respectively, and for the first six months of 2021 and 2020, 11 million and 4 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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