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FAIR VALUE MEASUREMENTS - Additional Information (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 04, 2021 EUR (€)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
In-process research and development impairments	$ 590	$ 4,180	$ 50
Write-off of finite-lived intangible asset	2,400	2,400	2,300
Manufacturing Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Write-off			381
Fair Value, Nonrecurring \| Galapagos
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Write-off of finite-lived intangible asset			$ 51
Immunomedics, Inc. \| Fair Value, Nonrecurring \| Level 3 \| Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Future royalties	800	900
Immunomedics, Inc. \| Fair Value, Nonrecurring \| Level 3 \| Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Future royalties	$ 1,100	$ 1,100
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contract maturities (in months)	18 months
Maximum \| MYR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability \| €				€ 300