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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Additional Information (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Galapagos |  |
Available-for-Sale Debt Securities |  |
Marketable equity securities | $ 535 | $ 686
Arcus |  |
Available-for-Sale Debt Securities |  |
Marketable equity securities | $ 568 | $ 283

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