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Earnings Per Share | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The calculations of earnings per share are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
($ and shares in millions except per share amounts) | 2023 |  | 2022 |  | 2023 |  | 2022
Net Income Attributable to Merck & Co., Inc. | $ | 4,745 |  |  | $ | 3,248 |  |  | $ | 1,591 |  |  | $ | 11,502 |
Average common shares outstanding | 2,537 |  |  | 2,533 |  |  | 2,538 |  |  | 2,531 |
Common shares issuable (1) | 9 |  |  | 9 |  |  | 11 |  |  | 9 |
Average common shares outstanding assuming dilution | 2,546 |  |  | 2,542 |  |  | 2,549 |  |  | 2,540 |
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders | $ | 1.87 |  |  | $ | 1.28 |  |  | $ | 0.63 |  |  | $ | 4.55 |
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders | $ | 1.86 |  |  | $ | 1.28 |  |  | $ | 0.62 |  |  | $ | 4.53 |
(1) Issuable primarily under share-based compensation plans. For the third quarter of 2023 and 2022, 6 million and 2 million, respectively, and for the first nine months of 2023 and 2022, 5 million and 5 million, respectively, of common shares issuable under share-based compensation plans were excluded from the computations of earnings per common share assuming dilution because the effect would have been antidilutive.

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