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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Jul. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | $ 5,100 | $ 5,100 |
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 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent consideration | 6 |  |
Fair Value, Inputs, 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) |  |

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