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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Billions | Jun. 30, 2019 | Dec. 31, 2018 | Jul. 01, 2015
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Fair Value Disclosures [Abstract] |  |  |
Fair value of debt | $ 4.2 | $ 4.0 |
UMass Joint Venture |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Ownership percentage by noncontrolling owners |  |  | 18.90%

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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