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FAIR VALUE MEASUREMENTS (Narrative) (Details) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 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 | $ 3,900,000,000 |  | $ 3,700,000,000 |
UMass Joint Venture |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  | 18.90%
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 | 5,000,000 |  |  |
Liability | 98,000,000 |  | $ 23,000,000 |
Fair Value, Inputs, Level 3 | Contingent Consideration | Other Liabilities |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Liability | 93,000,000 |  |  |
Fair Value, Inputs, Level 3 | Contingent Consideration | Accounts Payable and Accrued Expenses |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Liability | $ 5,000,000 |  |  |
Haystack Oncology, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration |  | $ 88,000,000 |  |
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 |  | 100,000,000 |  |
Haystack Oncology, Inc. | Additional, Reimbursement Coverage |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Maximum contingent consideration payment |  | $ 50,000,000 |  |
Haystack Oncology, Inc. | Additional Impact |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Impact of market discount rate on contingent consideration obligation | $ 21,000,000 |  |  |
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 | $ 7,000,000 |  |  |
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 |  |  |

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