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EARNINGS PER SHARE | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share, Basic and Diluted [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE The computation of basic and diluted earnings per common share is as follows (in millions, except per share data):
| 2020 |  | 2019 |  | 2018
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |
Income from continuing operations | $ | 1,431 |  |  | $ | 838 |  |  | $ | 736 |
Income from discontinued operations, net of taxes | — |  |  | 20 |  |  | — |
Net income attributable to Quest Diagnostics' common stockholders | $ | 1,431 |  |  | $ | 858 |  |  | $ | 736 |
Income from continuing operations | $ | 1,431 |  |  | $ | 838 |  |  | $ | 736 |
Less: Earnings allocated to participating securities | 6 |  |  | 3 |  |  | 3 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 1,425 |  |  | $ | 835 |  |  | $ | 733 |
Weighted average common shares outstanding – basic | 134 |  |  | 134 |  |  | 136 |
Effect of dilutive securities: |  |  |  |  |
Stock options and performance share units | 2 |  |  | 2 |  |  | 3 |
Weighted average common shares outstanding – diluted | 136 |  |  | 136 |  |  | 139 |
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic: |  |  |  |  |
Income from continuing operations | $ | 10.62 |  |  | $ | 6.21 |  |  | $ | 5.39 |
Income from discontinued operations | — |  |  | 0.15 |  |  | — |
Net income | $ | 10.62 |  |  | $ | 6.36 |  |  | $ | 5.39 |
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted: |  |  |  |  |
Income from continuing operations | $ | 10.47 |  |  | $ | 6.13 |  |  | $ | 5.29 |
Income from discontinued operations | — |  |  | 0.15 |  |  | — |
Net income | $ | 10.47 |  |  | $ | 6.28 |  |  | $ | 5.29 |
The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
| 2020 |  | 2019 |  | 2018
Stock options and performance share units | 1 |  |  | 3 |  |  | 2 |

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