Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details)

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INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of unrecognized tax benefits      
Unrecognized tax benefits, balance at the beginning of the period $ 23 $ 17  
Gross increases and decreases-tax positions taken during the prior period 1 3  
Gross increases and decreases-tax positions taken during the current period 3 4  
Reductions resulting from the lapse of statutes of limitation   (2)  
Foreign currency movements (1) 1  
Unrecognized tax benefits, balance at the end of the period 26 23 $ 17
Unrecognized tax benefits which, if recognized, would affect the effective tax rate 23 19  
Net increase (decrease) in unrecognized tax benefits with a corresponding income tax expense 5 9 2
Interest and penalties related to unrecognized tax benefits included in tax expense      
Interest expense included in tax expense     $ 1
Interest and penalties accrued related to unrecognized tax benefits      
Accrued liability for interest $ 3 $ 3  
Number of months from the reporting date during which unrecognized tax benefit would result in change in income tax 12 months    
Minimum      
Interest and penalties accrued related to unrecognized tax benefits      
Decrease in the unrecognized tax benefits reasonably possible, low end of range $ 0    
Maximum      
Interest and penalties accrued related to unrecognized tax benefits      
Decrease in the unrecognized tax benefits reasonably possible, low end of range $ 7