FAIR VALUE MEASUREMENTS (Narrative) (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jul. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	$ 6,300,000,000	$ 6,300,000,000	$ 4,600,000,000
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		9,000,000
Liability	113,000,000	113,000,000	104,000,000
Fair Value, Inputs, Level 3 | Contingent Consideration | Other Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability	85,000,000	85,000,000	99,000,000
Fair Value, Inputs, Level 3 | Contingent Consideration | Accounts Payable and Accrued Expenses
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability	$ 28,000,000	$ 28,000,000	$ 5,000,000
Haystack Oncology, Inc. | Comparable Company Revenue Volatility
Business Acquisition [Line Items]
Measurement input	0.40	0.40
Haystack Oncology, Inc. | Discount rate
Business Acquisition [Line Items]
Measurement input	0.105	0.105
Haystack Oncology, Inc. | Additional, Based on Revenue
Business Acquisition [Line Items]
Maximum contingent consideration payment				$ 100,000,000
Haystack Oncology, Inc. | Additional, Reimbursement Coverage
Business Acquisition [Line Items]
Maximum contingent consideration payment				$ 50,000,000
Haystack Oncology, Inc. | Additional Impact | Discount rate
Business Acquisition [Line Items]
Measurement input	0.05	0.05
Haystack Oncology, Inc. | Changing Comparable Company Revenue Volatility | Comparable Company Revenue Volatility
Business Acquisition [Line Items]
Measurement input	0.30	0.30
Increase in contingent consideration liability	$ 8,000,000
Haystack Oncology, Inc. | Changing Discount Rate | Comparable Company Revenue Volatility
Business Acquisition [Line Items]
Increase in contingent consideration liability	$ 4,000,000
Haystack Oncology, Inc. | Changing Discount Rate | Discount rate
Business Acquisition [Line Items]
Measurement input	0.070	0.070