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FAIR VALUE MEASUREMENTS - Equity Investment In Galapagos (Details) - Galapagos NV - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Equity investment $ 881 $ 1,648
Prepaid and other current assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Equity investment 0 351
Other long-term assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Equity investment $ 881 $ 1,297