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

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