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FAIR VALUE MEASUREMENTS (Narrative) (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 20, 2023
USD ($)
Dec. 31, 2021
USD ($)
Jul. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of debt $ 4,600,000,000 $ 3,700,000,000      
UMass Joint Venture          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Ownership percentage by noncontrolling owners         18.90%
Level 3 | Contingent Consideration          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Total fair value adjustments included in earnings - realized/unrealized 11,000,000 5,000,000      
Contingent consideration liability 104,000,000 23,000,000   $ 5,000,000  
Level 3 | Contingent Consideration | Other Liabilities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Contingent consideration liability 99,000,000        
Level 3 | Contingent Consideration | Accounts Payable and Accrued Liabilities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Contingent consideration liability 5,000,000 $ 23,000,000      
Haystack Oncology, Inc. | Additional, Based on Revenue          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Contingent consideration arrangements, range of outcomes, value, high     $ 100,000,000    
Haystack Oncology, Inc. | Additional, Reimbursement Coverage          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Contingent consideration arrangements, range of outcomes, value, high     $ 50,000,000    
Haystack Oncology, Inc. | Additional Impact          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impact of market discount rate on contingent consideration obligation $ 21,000,000        
Haystack Oncology, Inc. | Comparable Company Revenue Volatility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Measurement input 0.40        
Haystack Oncology, Inc. | Comparable Company Revenue Volatility | Changing Comparable Company Revenue Volatility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Measurement input 0.30        
Contingent consideration arrangements $ 7,000,000        
Haystack Oncology, Inc. | Comparable Company Revenue Volatility | Changing Discount Rate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Contingent consideration arrangements $ 4,000,000        
Haystack Oncology, Inc. | Discount rate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Measurement input 0.105        
Haystack Oncology, Inc. | Discount rate | Additional Impact          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Measurement input 0.05        
Haystack Oncology, Inc. | Discount rate | Changing Discount Rate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Measurement input 0.070