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BUSINESS ACQUISITIONS (Pro Forma) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |
Pro forma net revenues | $ 7,520 | $ 7,622
Pro forma income from continuing operations | $ 585 | $ 855
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic: |  |
Pro forma income from continuing operations | $ 3.79 | $ 5.40
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted: |  |
Pro forma income from continuing operations | $ 3.77 | $ 5.36

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