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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2015
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 (in millions, except per share data):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Amounts attributable to Quest Diagnostics’ stockholders: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 342 |  |  | $ | 129 |  |  | $ | 521 |  |  | $ | 366 |
Less: Earnings allocated to participating securities | 2 |  |  | 1 |  |  | 3 |  |  | 2 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 340 |  |  | $ | 128 |  |  | $ | 518 |  |  | $ | 364 |
Weighted average common shares outstanding – basic | 144 |  |  | 145 |  |  | 144 |  |  | 144 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Stock options and performance share units | 1 |  |  | — |  |  | 1 |  |  | 1 |
Weighted average common shares outstanding – diluted | 145 |  |  | 145 |  |  | 145 |  |  | 145 |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 2.37 |  |  | $ | 0.89 |  |  | $ | 3.61 |  |  | $ | 2.52 |
Diluted | $ | 2.35 |  |  | $ | 0.88 |  |  | $ | 3.58 |  |  | $ | 2.51 |
The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect (shares in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Stock options and performance share units | 2 |  |  | — |  |  | 2 |  |  | 3 |

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