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BUSINESS ACQUISITIONS - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Business Combinations [Abstract] |  |  |  |
Pro forma net revenues | $ 2,588 | $ 2,461 | $ 7,700 | $ 7,471
Pro forma net income attributable to Quest Diagnostics | $ 222 | $ 225 | $ 647 | $ 661
Pro forma earnings per share attributable to Quest Diagnostics' common stockholders: |  |  |  |
Basic (in dollars per share) | $ 1.97 | $ 1.99 | $ 5.78 | $ 5.87
Diluted (in dollars per share) | $ 1.95 | $ 1.97 | $ 5.72 | $ 5.79

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