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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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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

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