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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Available-for-Sale Debt Securities |  |  |  |  |
Allowance for credit losses | $ 0 |  | $ 0 |  |
Equity investments and equity method investments without readily determinable fair values | 337,000,000 |  | 337,000,000 |  | $ 423,000,000
Net unrealized loss on investment of equity securities | 168,000,000 | $ 197,000,000 | 356,000,000 | $ 596,000,000 |
Selling, general and administrative expenses | $ 1,315,000,000 | $ 1,213,000,000 | $ 4,482,000,000 | 3,653,000,000 |
Gilead Foundation | Related Party |  |  |  |  |
Available-for-Sale Debt Securities |  |  |  |  |
Selling, general and administrative expenses |  |  |  | $ 85,000,000 |

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- Definition Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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