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Earnings (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
In millions, except per share amounts | 2019 |  | 2018 |  | 2019 |  | 2018
Numerator for earnings (loss) per share calculation: |  |  |  |  |  |  |
Income (loss) from continuing operations | $ | 1,931 |  |  | $ | (2,562 | ) |  | $ | 3,358 |  |  | $ | (1,564 | )
Income from continuing operations allocated to participating securities | (1 | ) |  | (1 | ) |  | (3 | ) |  | (3 | )
(Income) loss from continuing operations attributable to noncontrolling interest | 5 |  |  | — |  |  | (1 | ) |  | — |
Income (l oss) from continuing operations attributable to CVS Health | $ | 1,935 |  |  | $ | (2,563 | ) |  | $ | 3,354 |  |  | $ | (1,567 | )
Denominator for earnings (loss) per share calculation: |  |  |  |  |  |  |
Weighted average shares, basic | 1,301 |  |  | 1,018 |  |  | 1,299 |  |  | 1,017 |
Effect of dilutive securities | 1 |  |  | — |  |  | 3 |  |  | — |
Weighted average shares, diluted | 1,302 |  |  | 1,018 |  |  | 1,302 |  |  | 1,017 |
Earnings (loss) per share from continuing operations: |  |  |  |  |  |  |
Basic | $ | 1.49 |  |  | $ | (2.52 | ) |  | $ | 2.58 |  |  | $ | (1.54 | )
Diluted | $ | 1.49 |  |  | $ | (2.52 | ) |  | $ | 2.58 |  |  | $ | (1.54 | )

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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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