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, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of unrecognized tax benefits      
Unrecognized tax benefits, balance at the beginning of the period $ 17 $ 37  
Gross increases and decreases-tax positions taken during the prior period 3 1  
Gross increases and decreases-tax positions taken during the current period 4 3  
Decreases related to settlement of amounts due to tax authorities   (21)  
Reductions resulting from the lapse of statutes of limitation (2) (1)  
Foreign currency movements 1 (2)  
Unrecognized tax benefits, balance at the end of the period 23 17 $ 37
Unrecognized tax benefits which, if recognized, would affect the effective tax rate 19 9  
Net increase (decrease) in unrecognized tax benefits with a corresponding income tax expense 9 2 $ 1
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 $ 9