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Earnings Per Share | 3 Months Ended
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Mar. 31, 2025
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The calculations of earnings per share are as follows:
| Three Months Ended March 31, |  |
($ and shares in millions except per share amounts) | 2025 |  | 2024 |  |  |  |
Net Income Attributable to Merck & Co., Inc. | $ | 5,079 |  |  | $ | 4,762 |  |  |  |  |
Average common shares outstanding | 2,523 |  |  | 2,533 |  |  |  |  |
Common shares issuable (1) | 8 |  |  | 11 |  |  |  |  |
Average common shares outstanding assuming dilution | 2,531 |  |  | 2,544 |  |  |  |  |
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders | $ | 2.01 |  |  | $ | 1.88 |  |  |  |  |
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders | $ | 2.01 |  |  | $ | 1.87 |  |  |  |  |
(1) Issuable primarily under share-based compensation plans. For the first quarter of 2025 and 2024, 10 million and 3 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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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details
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