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ACQUISITIONS, DIVESTITURES, LICENSING AND OTHER ARRANGEMENTS - Purchase Price Allocation of Mirati Acquisition (Details) - USD ($) $ in Millions	Mar. 31, 2024	Jan. 23, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Goodwill	$ 21,738		$ 21,169
Mirati Therapeutics
Business Acquisition [Line Items]
Cash and cash equivalents		$ 748
Inventories		215
Other assets		159
Intangible assets		4,225
Deferred income tax asset		734
Deferred income tax liability		(1,094)
Other liabilities		(204)
Identifiable net assets acquired		4,783
Goodwill		152
Total consideration allocated		$ 4,935