v3.26.1
FAIR VALUE MEASUREMENTS - Additional Information (Details)
3 Months Ended
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jul. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt $ 5,600,000,000 $ 5,700,000,000    
UMass Joint Venture        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Ownership percentage by noncontrolling owners       18.90%
Fair Value, Inputs, Level 3 | Contingent Consideration        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total fair value adjustments included in earnings - realized/unrealized 3,000,000      
Liability 99,000,000 96,000,000    
Fair Value, Inputs, Level 3 | Contingent Consideration | Other Liabilities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 47,000,000 45,000,000    
Fair Value, Inputs, Level 3 | Contingent Consideration | Accounts Payable and Accrued Expenses        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability $ 52,000,000 $ 51,000,000    
Haystack Oncology, Inc. | Comparable Company Revenue Volatility        
Business Combination [Line Items]        
Measurement input 0.25      
Haystack Oncology, Inc. | Discount rate        
Business Combination [Line Items]        
Measurement input 0.070      
Haystack Oncology, Inc. | Additional, Based on Revenue        
Business Combination [Line Items]        
Maximum contingent consideration payment     $ 100,000,000  
Haystack Oncology, Inc. | Additional, Reimbursement Coverage        
Business Combination [Line Items]        
Maximum contingent consideration payment     $ 50,000,000  
Haystack Oncology, Inc. | Additional Impact | Discount rate        
Business Combination [Line Items]        
Measurement input 0.05      
Haystack Oncology, Inc. | Changing Comparable Company Revenue Volatility | Comparable Company Revenue Volatility        
Business Combination [Line Items]        
Measurement input 0.30      
Increase in contingent consideration liability $ 3,000,000      
Haystack Oncology, Inc. | Changing Discount Rate | Comparable Company Revenue Volatility        
Business Combination [Line Items]        
Increase in contingent consideration liability $ 5,000,000      
Haystack Oncology, Inc. | Changing Discount Rate | Discount rate        
Business Combination [Line Items]        
Measurement input 0.105