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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2018
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 years ended December 31:
In millions, except per share amounts | 2018 |  | 2017 |  | 2016
Numerator for earnings per share calculation: |  |  |  |  |
Income (loss) from continuing operations | $ | (596 | ) |  | $ | 6,631 |  |  | $ | 5,320 |
Income allocated to participating securities | (3 | ) |  | (24 | ) |  | (27 | )
Net (income) loss attributable to noncontrolling interests | 2 |  |  | (1 | ) |  | (2 | )
Income (loss) from continuing operations attributable to CVS Health | $ | (597 | ) |  | $ | 6,606 |  |  | $ | 5,291 |
Denominator for earnings per share calculation: |  |  |  |  |
Weighted average shares, basic | 1,044 |  |  | 1,020 |  |  | 1,073 |
Effect of dilutive securities | — |  |  | 4 |  |  | 6 |
Weighted average shares, diluted | 1,044 |  |  | 1,024 |  |  | 1,079 |
Earnings (loss) per share from continuing operations: |  |  |  |  |
Basic | $ | (0.57 | ) |  | $ | 6.48 |  |  | $ | 4.93 |
Diluted | $ | (0.57 | ) |  | $ | 6.45 |  |  | $ | 4.91 |

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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/2003/role/presentationRef -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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