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EARNINGS PER SHARE | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE The computation of basic and diluted earnings per common share for the years ended December 31, 2023, 2022 and 2021 is as follows (in millions, except per share data):
| 2023 |  | 2022 |  | 2021
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 854 |  |  | $ | 946 |  |  | $ | 1,995 |
Less: Earnings allocated to participating securities | 4 |  |  | 4 |  |  | 7 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 850 |  |  | $ | 942 |  |  | $ | 1,988 |
Weighted average common shares outstanding – basic | 112 |  |  | 116 |  |  | 125 |
Effect of dilutive securities: |  |  |  |  |
Stock options and performance share units | 1 |  |  | 2 |  |  | 3 |
Weighted average common shares outstanding – diluted | 113 |  |  | 118 |  |  | 128 |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |
Basic | $ | 7.59 |  |  | $ | 8.10 |  |  | $ | 15.85 |
Diluted | $ | 7.49 |  |  | $ | 7.97 |  |  | $ | 15.55 |

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