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Earnings (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Earnings Per Share | The following is a reconciliation of basic and diluted earnings (loss) per share from continuing operations for the respective periods:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
In millions, except per share amounts | 2019 |  | 2018 |  | 2019 |  | 2018
Numerator for earnings (loss) per share calculation: |  |  |  |  |  |  |
Income (loss) from continuing operations | $ | 1,529 |  |  | $ | 1,390 |  |  | $ | 4,887 |  |  | $ | (174 | )
Income from continuing operations allocated to participating securities | — |  |  | (1 | ) |  | (3 | ) |  | (3 | )
Loss from continuing operations attributable to noncontrolling interest | 1 |  |  | — |  |  | — |  |  | — |
Income (loss) from continuing operations attributable to CVS Health | $ | 1,530 |  |  | $ | 1,389 |  |  | $ | 4,884 |  |  | $ | (177 | )
Denominator for earnings (loss) per share calculation: |  |  |  |  |  |  |
Weighted average shares, basic | 1,302 |  |  | 1,020 |  |  | 1,300 |  |  | 1,018 |
Effect of dilutive securities | 3 |  |  | 2 |  |  | 3 |  |  | — |
Weighted average shares, diluted | 1,305 |  |  | 1,022 |  |  | 1,303 |  |  | 1,018 |
Earnings (loss) per share from continuing operations: |  |  |  |  |  |  |
Basic | $ | 1.17 |  |  | $ | 1.36 |  |  | $ | 3.76 |  |  | $ | (0.17 | )
Diluted | $ | 1.17 |  |  | $ | 1.36 |  |  | $ | 3.75 |  |  | $ | (0.17 | )

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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