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BUSINESS ACQUISITIONS - Pro Forma (Details) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2024 USD ($) $ / shares
Business Combinations [Abstract] |
Pro forma net revenues | $ | $ 2,535
Pro forma net income attributable to Quest Diagnostics | $ | $ 191
Pro forma earnings per share attributable to Quest Diagnostics' common stockholders: |
Basic (in dollars per share) | $ / shares | $ 1.71
Diluted (in dollars per share) | $ / shares | $ 1.70

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