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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Available-for-Sale Securities |  |  |
Marketable equity securities | $ 1,577 | $ 1,086 |
Selling, general and administrative expenses | 6,091 | 6,090 | $ 5,673
Galapagos | Fair value, recurring |  |  |
Available-for-Sale Securities |  |  |
Marketable equity securities | 462 |  |
Equity securities subject to contractual sale restrictions |  | 686 |
Arcus | Fair value, recurring |  |  |
Available-for-Sale Securities |  |  |
Marketable equity securities | $ 448 | $ 283 |
Gilead Foundation | Related Party |  |  |
Available-for-Sale Securities |  |  |
Selling, general and administrative expenses |  |  | $ 85

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