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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2025
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,
| 2025 |  | 2024 |  | 2025 |  | 2024
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 245 |  |  | $ | 226 |  |  | $ | 747 |  |  | $ | 649 |
Less: Earnings allocated to participating securities | 2 |  |  | 1 |  |  | 4 |  |  | 3 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 243 |  |  | $ | 225 |  |  | $ | 743 |  |  | $ | 646 |
Weighted average common shares outstanding – basic | 112 |  |  | 112 |  |  | 112 |  |  | 111 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options and performance share units | 1 |  |  | 1 |  |  | 1 |  |  | 1 |
Weighted average common shares outstanding – diluted | 113 |  |  | 113 |  |  | 113 |  |  | 112 |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Basic | $ | 2.18 |  |  | $ | 2.01 |  |  | $ | 6.66 |  |  | $ | 5.80 |
Diluted | $ | 2.16 |  |  | $ | 1.99 |  |  | $ | 6.57 |  |  | $ | 5.74 |
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,
| 2025 |  | 2024 |  | 2025 |  | 2024
Stock options and performance share units | — |  |  | — |  |  | — |  |  | 1 |

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