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Earnings Per Share | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | 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. The Company recorded a net loss for the three and six months ended June 30, 2023; therefore, no potential dilutive common shares were used in the computations of loss per common share assuming dilution because the effects would have been antidilutive. For the three and six months ended June 30, 2022, 2 million and 6 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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