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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Calculations of Earnings Per Share | The calculations of earnings per share are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
($ and shares in millions except per share amounts) | 2021 |  | 2020 |  | 2021 |  | 2020
Net Income from Continuing Operations Attributable to Merck & Co., Inc. | $ | 4,567 |  |  | $ | 2,324 |  |  | $ | 8,525 |  |  | $ | 7,136 |
Income from Discontinued Operations, Net of Taxes and Amounts Attributable to Noncontrolling Interests | — |  |  | 617 |  |  | 766 |  |  | 2,025 |
Net Income Attributable to Merck & Co., Inc. | $ | 4,567 |  |  | $ | 2,941 |  |  | $ | 9,291 |  |  | $ | 9,161 |
Average common shares outstanding | 2,530 |  |  | 2,529 |  |  | 2,531 |  |  | 2,530 |
Common shares issuable (1) | 6 |  |  | 9 |  |  | 8 |  |  | 11 |
Average common shares outstanding assuming dilution | 2,536 |  |  | 2,538 |  |  | 2,539 |  |  | 2,541 |
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders: |  |  |  |  |  |  |
Income from Continuing Operations | $ | 1.81 |  |  | $ | 0.92 |  |  | $ | 3.37 |  |  | $ | 2.82 |
Income from Discontinued Operations | — |  |  | 0.24 |  |  | 0.30 |  |  | 0.80 |
Net Income | $ | 1.81 |  |  | $ | 1.16 |  |  | $ | 3.67 |  |  | $ | 3.62 |
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders: |  |  |  |  |  |  |
Income from Continuing Operations | $ | 1.80 |  |  | $ | 0.92 |  |  | $ | 3.36 |  |  | $ | 2.81 |
Income from Discontinued Operations | — |  |  | 0.24 |  |  | 0.30 |  |  | 0.80 |
Net Income | $ | 1.80 |  |  | $ | 1.16 |  |  | $ | 3.66 |  |  | $ | 3.61 |
(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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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