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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share, Basic and Diluted [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The computation of basic and diluted earnings per common share was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 219 |  |  | $ | 193 |  |  | $ | 396 |  |  | $ | 357 |
Less: Earnings allocated to participating securities | — |  |  | — |  |  | 1 |  |  | 1 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 219 |  |  | $ | 193 |  |  | $ | 395 |  |  | $ | 356 |
Weighted average common shares outstanding – basic | 136 |  |  | 137 |  |  | 136 |  |  | 137 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Stock options and performance share units | 3 |  |  | 3 |  |  | 3 |  |  | 3 |
Weighted average common shares outstanding – diluted | 139 |  |  | 140 |  |  | 139 |  |  | 140 |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 1.60 |  |  | $ | 1.40 |  |  | $ | 2.90 |  |  | $ | 2.59 |
Diluted | $ | 1.57 |  |  | $ | 1.37 |  |  | $ | 2.84 |  |  | $ | 2.53 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | 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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock options | 2 |  |  | 2 |  |  | 2 |  |  | 1 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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