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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Available-for-Sale Securities |  |  |
Allowance for credit losses | $ 0 |  |
Selling, general and administrative expenses | 6,090 | $ 5,673 | $ 5,246
Galapagos | Fair value, recurring |  |  |
Available-for-Sale Securities |  |  |
Marketable equity securities | 686 |  |
Equity investment, noncurrent |  | 736 |
Galapagos | Level 1 | Fair value, recurring |  |  |
Available-for-Sale Securities |  |  |
Marketable equity securities | 686 |  |
Arcus | Fair value, recurring |  |  |
Available-for-Sale Securities |  |  |
Marketable equity securities | $ 283 | 286 |
Gilead Foundation | Related Party |  |  |
Available-for-Sale Securities |  |  |
Selling, general and administrative expenses |  | $ 85 | $ 212

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