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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
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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