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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2023
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The computation of basic and diluted earnings per common share was as follows (in millions, except per share data):
| Three Months Ended March 31, |  |
| 2023 |  | 2022 |  |  |  |
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 202 |  |  | $ | 355 |  |  |  |  |
Less: Earnings allocated to participating securities | 1 |  |  | 1 |  |  |  |  |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 201 |  |  | $ | 354 |  |  |  |  |
Weighted average common shares outstanding – basic | 112 |  |  | 119 |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options and performance share units | 1 |  |  | 2 |  |  |  |  |
Weighted average common shares outstanding – diluted | 113 |  |  | 121 |  |  |  |  |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |
Basic | $ | 1.80 |  |  | $ | 2.97 |  |  |  |  |
Diluted | $ | 1.78 |  |  | $ | 2.92 |  |  |  |  |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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