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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on a Non-Recurring Basis (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other non-current assets: |  |
Non-current assets held for sale | $ 245 | $ 39
Level 1 |  |
Other non-current assets: |  |
Non-current assets held for sale | 0 | 0
Level 2 |  |
Other non-current assets: |  |
Non-current assets held for sale | 0 | 0
Level 3 |  |
Other non-current assets: |  |
Non-current assets held for sale | $ 245 | $ 39

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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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