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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jul. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent consideration, liability | $ 0 |  |
Fair value of debt | 4,600,000,000 | $ 5,100,000,000 |
UMass Joint Venture |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Ownership percentage by noncontrolling owners |  |  | 18.90%
Level 3 | Contingent Consideration |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total (gains)/losses included in earnings - realized/unrealized | 1,000,000 | 12,000,000 |
Level 3 | Contingent Consideration | Other Operating Income (Expense) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total (gains)/losses included in earnings - realized/unrealized | $ 1,000,000 | $ 12,000,000 |

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