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EARNINGS (LOSS) PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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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- 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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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