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ACQUISITIONS, DIVESTITURES, LICENSING AND OTHER ARRANGEMENTS - Schedule of Assets Acquired and Liabilities Assumed in Karuna Acquisition (Details) - Karuna - USD ($)
$ in Millions
12 Months Ended
Mar. 18, 2024
Dec. 31, 2024
Business Combination [Line Items]    
Payments for asset acquisitions $ 14,027  
Transaction costs 55  
Total consideration allocated 13,793  
Common Stock    
Business Combination [Line Items]    
Payments for asset acquisitions 12,606  
Equity    
Business Combination [Line Items]    
Payments for asset acquisitions 1,421  
Unvested Equity Awards    
Business Combination [Line Items]    
Less: Charge for unvested stock awards $ (289)  
Unvested Equity Awards | Selling, general and administrative    
Business Combination [Line Items]    
Payments for asset acquisitions   $ 130
Unvested Equity Awards | Research and development    
Business Combination [Line Items]    
Payments for asset acquisitions   $ 159