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FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 20, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	$ 4,000		$ 3,700
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]
Liability	93		$ 23
Fair Value, Inputs, Level 3 | Contingent Consideration | Other Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability	88
Fair Value, Inputs, Level 3 | Contingent Consideration | Accounts Payable and Accrued Expenses
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability	$ 5
Haystack Oncology, Inc.
Business Acquisition [Line Items]
Contingent consideration		$ 88
Haystack Oncology, Inc. | Comparable Company Revenue Volatility
Business Acquisition [Line Items]
Measurement input	0.40
Haystack Oncology, Inc. | Discount rate
Business Acquisition [Line Items]
Measurement input	0.105
Haystack Oncology, Inc. | Additional, Based on Revenue
Business Acquisition [Line Items]
Maximum contingent consideration payment		100
Haystack Oncology, Inc. | Additional, Reimbursement Coverage
Business Acquisition [Line Items]
Maximum contingent consideration payment		50
Haystack Oncology, Inc. | Additional Impact
Business Acquisition [Line Items]
Impact of market discount rate on contingent consideration obligation	$ 21
Contingent consideration		$ 88
Haystack Oncology, Inc. | Additional Impact | Discount rate
Business Acquisition [Line Items]
Measurement input	0.05
Haystack Oncology, Inc. | Changing Comparable Company Revenue Volatility | Comparable Company Revenue Volatility
Business Acquisition [Line Items]
Measurement input	0.30
Increase in contingent consideration liability	$ 7
Haystack Oncology, Inc. | Changing Discount Rate | Comparable Company Revenue Volatility
Business Acquisition [Line Items]
Increase in contingent consideration liability	$ 5
Haystack Oncology, Inc. | Changing Discount Rate | Discount rate
Business Acquisition [Line Items]
Measurement input	0.070

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