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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [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 September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 225 |  |  | $ | 256 |  |  | $ | 662 |  |  | $ | 845 |
Less: Earnings allocated to participating securities | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 223 |  |  | $ | 254 |  |  | $ | 658 |  |  | $ | 841 |
Weighted average common shares outstanding – basic | 112 |  |  | 116 |  |  | 112 |  |  | 117 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options and performance share units | 2 |  |  | 2 |  |  | 2 |  |  | 2 |
Weighted average common shares outstanding – diluted | 114 |  |  | 118 |  |  | 114 |  |  | 119 |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Basic | $ | 1.99 |  |  | $ | 2.20 |  |  | $ | 5.87 |  |  | $ | 7.17 |
Diluted | $ | 1.96 |  |  | $ | 2.17 |  |  | $ | 5.79 |  |  | $ | 7.05 |
The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Stock options and performance share units | 1 |  |  | 1 |  |  | — |  |  | — |

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