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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Classification of Equity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Feb. 28, 2025 | Dec. 31, 2024
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Equity method investments and other equity investments without readily determinable fair values: |  |  |
Other long-term assets | $ 393 |  | $ 386
Equity Securities, FV-NI And Without Readily Determinable Fair Value And Equipment Method Investments [Abstract] |  |  |
Total | $ 8,344 |  | 10,791
Arcus |  |  |
Equity Securities, FV-NI And Without Readily Determinable Fair Value And Equipment Method Investments [Abstract] |  |  |
Ownership (as a percent) |  | 30.00% |
Assembly Biosciences, Inc |  |  |
Equity Securities, FV-NI And Without Readily Determinable Fair Value And Equipment Method Investments [Abstract] |  |  |
Ownership (as a percent) | 27.00% |  |
Cash and cash equivalents |  |  |
Equity securities measured at fair value: |  |  |
Equity securities measured at fair value | $ 5,745 |  | 8,502
Prepaid and other current assets: | Galapagos |  |  |
Equity securities measured at fair value: |  |  |
Equity securities measured at fair value | 570 |  | 462
Prepaid and other current assets: | Arcus |  |  |
Equity securities measured at fair value: |  |  |
Equity securities measured at fair value | 427 |  | 448
Prepaid and other current assets: | Assembly Biosciences, Inc |  |  |
Equity securities measured at fair value: |  |  |
Equity securities measured at fair value | 143 |  | 53
Prepaid and other current assets: | Other |  |  |
Equity securities measured at fair value: |  |  |
Equity securities measured at fair value | 686 |  | 614
Other long-term assets |  |  |
Equity securities measured at fair value: |  |  |
Equity securities measured at fair value | $ 380 |  | $ 327

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