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FAIR VALUE MEASUREMENTS - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 01, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Asset impairment charges | $ 5,000,000 | $ 0 | $ 29,000,000 | $ 0 |  |  |
Fair value of debt | 5,700,000,000 |  | 5,700,000,000 |  | $ 6,100,000,000 |  |
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 |  |  | 8,000,000 |  |  |  |
Liability | 114,000,000 |  | 114,000,000 |  | 106,000,000 |  |
Fair Value, Inputs, Level 3 | Contingent Consideration | Other Liabilities |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Liability | 63,000,000 |  | 63,000,000 |  | 101,000,000 |  |
Fair Value, Inputs, Level 3 | Contingent Consideration | Accounts Payable and Accrued Expenses |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Liability | $ 51,000,000 |  | $ 51,000,000 |  | $ 5,000,000 |  |
Haystack Oncology, Inc. | Comparable Company Revenue Volatility |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Measurement input | 0.35 |  | 0.35 |  |  |  |
Haystack Oncology, Inc. | Discount rate |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Measurement input | 0.105 |  | 0.105 |  |  |  |
Haystack Oncology, Inc. | Additional, Based on Revenue |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Maximum contingent consideration payment |  |  |  |  |  | $ 100,000,000 |
Haystack Oncology, Inc. | Additional, Reimbursement Coverage |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Maximum contingent consideration payment |  |  |  |  |  | $ 50,000,000 |
Haystack Oncology, Inc. | Additional Impact | Discount rate |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Measurement input | 0.05 |  | 0.05 |  |  |  |
Haystack Oncology, Inc. | Changing Comparable Company Revenue Volatility | Comparable Company Revenue Volatility |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Measurement input | 0.25 |  | 0.25 |  |  |  |
Increase in contingent consideration liability |  |  | $ 4,000,000 |  |  |  |
Haystack Oncology, Inc. | Changing Discount Rate | Discount rate |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Measurement input | 0.070 |  | 0.070 |  |  |  |
Increase in contingent consideration liability |  |  | $ 2,000,000 |  |  |  |

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