v3.26.1
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Derivative Instruments, Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Foreign currency exchange contracts | Gains/(losses) recognized in Alliance and other revenues    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net $ (15)  
Foreign currency exchange contracts | (Gains)/losses recognized in Cost of products sold    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net   $ (26)
Foreign currency exchange contracts | (Gains)/losses recognized in Other (income)/expense, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net (22) 16
Cross-currency swap contracts | Gains/(losses) recognized in Alliance and other revenues    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 0  
Cross-currency swap contracts | (Gains)/losses recognized in Cost of products sold    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net   0
Cross-currency swap contracts | (Gains)/losses recognized in Other (income)/expense, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 12 (50)
Interest rate swap contracts | Gains/(losses) recognized in Alliance and other revenues    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 0  
Interest rate swap contracts | (Gains)/losses recognized in Cost of products sold    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net   0
Interest rate swap contracts | (Gains)/losses recognized in Other (income)/expense, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net (5) (1)
Forward interest rate contracts | Gains/(losses) recognized in Alliance and other revenues    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net 0  
Forward interest rate contracts | (Gains)/losses recognized in Cost of products sold    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net   0
Forward interest rate contracts | (Gains)/losses recognized in Other (income)/expense, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on derivative, net $ (1) $ (1)