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INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits at beginning of period | $ 24 | $ 28 | $ 21
Gross change for prior-period positions | 1 | 0 | 8
Gross change for current year positions | 1 | 0 | 0
Decrease due to settlements and payments | 0 | (4) | 0
Decrease due to statute expirations | 0 | 0 | 0
Increase due to effect of foreign currency translation | 1 | 0 | 0
Decrease due to effect from foreign currency translation | 0 | 0 | (1)
Unrecognized tax benefits at end of period | $ 27 | $ 24 | $ 28

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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