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EARNINGS PER SHARE | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share, Basic and Diluted [Abstract] |
EARNINGS (LOSS) PER SHARE | EARNINGS PER SHARE The computation of basic and diluted earnings per common share was as follows (in millions, except per share data):
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 469 |  |  | $ | 99 |  |  |  |  |
Less: Earnings allocated to participating securities | 1 |  |  | — |  |  |  |  |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 468 |  |  | $ | 99 |  |  |  |  |
Weighted average common shares outstanding – basic | 133 |  |  | 134 |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options and performance share units | 2 |  |  | 1 |  |  |  |  |
Weighted average common shares outstanding – diluted | 135 |  |  | 135 |  |  |  |  |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Basic | $ | 3.52 |  |  | $ | 0.74 |  |  |  |  |
Diluted | $ | 3.46 |  |  | $ | 0.73 |  |  |  |  |
The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Stock options and performance share units | 1 |  |  | 2 |  |  |  |  |

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