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EARNINGS PER SHARE | 6 Months Ended
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Jun. 30, 2024
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 June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 229 |  |  | $ | 235 |  |  | $ | 423 |  |  | $ | 437 |
Less: Earnings allocated to participating securities | 1 |  |  | 1 |  |  | 2 |  |  | 2 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 228 |  |  | $ | 234 |  |  | $ | 421 |  |  | $ | 435 |
Weighted average common shares outstanding – basic | 111 |  |  | 112 |  |  | 111 |  |  | 112 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options and performance share units | 1 |  |  | 2 |  |  | 1 |  |  | 2 |
Weighted average common shares outstanding – diluted | 112 |  |  | 114 |  |  | 112 |  |  | 114 |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Basic | $ | 2.05 |  |  | $ | 2.08 |  |  | $ | 3.79 |  |  | $ | 3.88 |
Diluted | $ | 2.03 |  |  | $ | 2.05 |  |  | $ | 3.75 |  |  | $ | 3.83 |
The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Stock options and performance share units | 1 |  |  | — |  |  | 1 |  |  | — |

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