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FAIR VALUE MEASUREMENTS (Narrative) (Details) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Jul. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | $ 4,300,000,000 | $ 4,300,000,000 | $ 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 |  | 6,000,000 |  |  |
Liability | 110,000,000 | 110,000,000 | 104,000,000 |  |
Fair Value, Inputs, Level 3 | Contingent Consideration | Other Liabilities |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liability | 82,000,000 | 82,000,000 | 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 | $ 5,000,000 |  |  |  |
Haystack Oncology, Inc. | Changing Discount Rate | Discount rate |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Measurement input | 0.070 | 0.070 |  |  |

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