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Earnings per Share | 12 Months Ended
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Dec. 31, 2023
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 | 2023 |  | 2022 |  | 2021
Net Income from Continuing Operations Attributable to Merck & Co., Inc. | $ | 365 |  |  | $ | 14,519 |  |  | $ | 12,345 |
Income from Discontinued Operations, Net of Taxes and Amounts Attributable to Noncontrolling Interests | — |  |  | — |  |  | 704 |
Net Income Attributable to Merck & Co., Inc. | $ | 365 |  |  | $ | 14,519 |  |  | $ | 13,049 |
Average common shares outstanding | 2,537 |  |  | 2,532 |  |  | 2,530 |
Common shares issuable (1) | 10 |  |  | 10 |  |  | 8 |
Average common shares outstanding assuming dilution | 2,547 |  |  | 2,542 |  |  | 2,538 |
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders: |  |  |  |  |
Income from Continuing Operations | $ | 0.14 |  |  | $ | 5.73 |  |  | $ | 4.88 |
Income from Discontinued Operations | — |  |  | — |  |  | 0.28 |
Net Income | $ | 0.14 |  |  | $ | 5.73 |  |  | $ | 5.16 |
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders: |  |  |  |  |
Income from Continuing Operations | $ | 0.14 |  |  | $ | 5.71 |  |  | $ | 4.86 |
Income from Discontinued Operations | — |  |  | — |  |  | 0.28 |
Net Income | $ | 0.14 |  |  | $ | 5.71 |  |  | $ | 5.14 |
(1) Issuable primarily under share-based compensation plans. In 2023, 2022 and 2021, 5 million, 2 million and 9 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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