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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-Sale [Abstract] |  |  |  |  |
Aggregate fair value of investments, unrealized losses | $ 2,100,000,000 |  | $ 2,100,000,000 |  | $ 2,000,000,000
Allowance for credit losses | 0 |  | 0 |  |
Equity investments and equity method investments without readily determinable fair values | 415,000,000 |  | 415,000,000 |  | $ 338,000,000
Net unrealized loss on investment of equity securities | $ 197,000,000 | $ 142,000,000 | 596,000,000 | $ 667,000,000 |
Equity Securities Donation | Gilead Foundation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Donation expense |  |  | $ 85,000,000 | $ 212,000,000 |

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