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Earnings Per Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Earnings per share is computed using the two-class method. Stock appreciation rights and options to purchase 17 million and 16 million shares of common stock were outstanding, but were excluded from the calculation of diluted earnings per share for the three and nine months ended September 30, 2020, respectively, because their exercise prices were greater than the average market price of the common shares and, therefore, the effect would be antidilutive. For the same reason, stock appreciation rights and options to purchase 18 million and 19 million shares of common stock were outstanding, but were excluded from the calculation of diluted earnings per share for the three and nine months ended September 30, 2019, respectively. The following is a reconciliation of basic and diluted earnings per share for the respective periods:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
In millions, except per share amounts | 2020 |  | 2019 |  | 2020 |  | 2019
Numerator for earnings per share calculation: |  |  |  |  |  |  |
Net income | $ | 1,219 |  |  | $ | 1,529 |  |  | $ | 6,217 |  |  | $ | 4,887 |
Income allocated to participating securities | — |  |  | — |  |  | — |  |  | (3) |
Net (income) loss attributable to noncontrolling interests | 5 |  |  | 1 |  |  | (11) |  |  | — |
Net income attributable to CVS Health | $ | 1,224 |  |  | $ | 1,530 |  |  | $ | 6,206 |  |  | $ | 4,884 |
Denominator for earnings per share calculation: |  |  |  |  |  |  |
Weighted average shares, basic | 1,310 |  |  | 1,302 |  |  | 1,308 |  |  | 1,300 |
Effect of dilutive securities | 5 |  |  | 3 |  |  | 6 |  |  | 3 |
Weighted average shares, diluted | 1,315 |  |  | 1,305 |  |  | 1,314 |  |  | 1,303 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 0.93 |  |  | $ | 1.17 |  |  | $ | 4.74 |  |  | $ | 3.76 |
Diluted | $ | 0.93 |  |  | $ | 1.17 |  |  | $ | 4.72 |  |  | $ | 3.75 |

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