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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Calculations of (Loss) Earnings Per Share | The calculations of (loss) earnings per share are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
($ and shares in millions except per share amounts) | 2023 |  | 2022 |  | 2023 |  | 2022
Net (Loss) Income Attributable to Merck & Co., Inc. | $ | (5,975) |  |  | $ | 3,944 |  |  | $ | (3,154) |  |  | $ | 8,254 |
Average common shares outstanding | 2,539 |  |  | 2,531 |  |  | 2,539 |  |  | 2,529 |
Common shares issuable (1) | — |  |  | 9 |  |  | — |  |  | 9 |
Average common shares outstanding assuming dilution | 2,539 |  |  | 2,540 |  |  | 2,539 |  |  | 2,538 |
Basic (Loss) Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders | $ | (2.35) |  |  | $ | 1.56 |  |  | $ | (1.24) |  |  | $ | 3.26 |
(Loss) Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders | $ | (2.35) |  |  | $ | 1.55 |  |  | $ | (1.24) |  |  | $ | 3.25 |
(1) Issuable primarily under share-based compensation plans.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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