Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - FOREIGN CURRENCY TRANSLATION (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - FOREIGN CURRENCY TRANSLATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
FOREIGN CURRENCY TRANSLATION      
Cumulative inflation rate used to determine if economic environment is highly inflationary (as a percent) 100.00%    
Period used to determine if economic environment is highly inflationary 3 years    
Foreign currency transaction gains $ 3 $ 5 $ 2