INCOME TAXES - Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
12 Months Ended | |
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Dec. 31, 2017 |
Dec. 31, 2016 |
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| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||
| Unrecognized tax benefits at beginning of period | $ 24 | $ 23 |
| Gross increases for tax positions taken during current period | 0 | 1 |
| Gross increases for tax positions taken during prior years | 26 | 0 |
| Unrecognized tax benefits at end of period | $ 50 | $ 24 |
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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