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INCOME TAXES - Changes in Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Deferred Tax Asset, Valuation Allowance [Roll Forward] |  |
Balance at beginning of period | $ (72) | $ (72)
Balance at end of period | (53) | (72)
Increases primarily related to foreign NOLs |  |
Deferred Tax Asset, Valuation Allowance [Roll Forward] |  |
Valuation allowance, increase (decrease) | (16) | (9)
Releases related to foreign NOLs |  |
Deferred Tax Asset, Valuation Allowance [Roll Forward] |  |
Valuation allowance, increase (decrease) | 0 | 10
Foreign subsidiaries tax impacts due to divestiture |  |
Deferred Tax Asset, Valuation Allowance [Roll Forward] |  |
Valuation allowance, increase (decrease) | 39 | 0
Other changes, net |  |
Deferred Tax Asset, Valuation Allowance [Roll Forward] |  |
Valuation allowance, increase (decrease) | (2) | 0
Increase related to U.S. foreign tax credits |  |
Deferred Tax Asset, Valuation Allowance [Roll Forward] |  |
Valuation allowance, increase (decrease) | $ (2) | $ (1)

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- Definition Deferred Tax Asset, Valuation Allowance [Roll Forward] + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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