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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share, Basic and Diluted [Abstract] |
EARNINGS (LOSS) PER SHARE | EARNINGS PER SHARE The computation of basic and diluted earnings per common share was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 213 |  |  | $ | 161 |  |  | $ | 609 |  |  | $ | 518 |
Less: Earnings allocated to participating securities | 1 |  |  | 1 |  |  | 2 |  |  | 2 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 212 |  |  | $ | 160 |  |  | $ | 607 |  |  | $ | 516 |
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 | $ | 1.56 |  |  | $ | 1.18 |  |  | $ | 4.46 |  |  | $ | 3.77 |
Diluted | $ | 1.53 |  |  | $ | 1.15 |  |  | $ | 4.37 |  |  | $ | 3.68 |
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock options | 2 |  |  | 2 |  |  | 2 |  |  | 1 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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