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INVESTMENTS - Related Party Transaction (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Related Party Transaction [Line Items] |  |  |  |
Selling, general and administrative expenses | $ 1,921 | $ 1,365 | $ 3,372 | $ 2,623
Gilead Foundation | Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Selling, general and administrative expenses |  |  | $ 63 |

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