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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jul. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | $ 5,100 | $ 4,000 |
UMass Joint Venture |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Ownership percentage by noncontrolling owners |  |  | 18.90%
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent consideration, liability | 7 |  |
Level 3 | Contingent Consideration |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total (gains)/losses included in earnings - realized/unrealized | 12 | 11 |
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 | $ 12 | $ 11 |

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