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Earnings per Share | 12 Months Ended
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Dec. 31, 2024
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 | 2024 |  | 2023 |  | 2022
Net Income Attributable to Merck & Co., Inc. | $ | 17,117 |  |  | $ | 365 |  |  | $ | 14,519 |
Average common shares outstanding | 2,532 |  |  | 2,537 |  |  | 2,532 |
Common shares issuable (1) | 9 |  |  | 10 |  |  | 10 |
Average common shares outstanding assuming dilution | 2,541 |  |  | 2,547 |  |  | 2,542 |
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders | $ | 6.76 |  |  | $ | 0.14 |  |  | $ | 5.73 |
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders | $ | 6.74 |  |  | $ | 0.14 |  |  | $ | 5.71 |
(1) Issuable primarily under share-based compensation plans. In 2024, 2023 and 2022, 6 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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- 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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