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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and cash equivalents [abstract]        
Cash $ 258 $ 652    
Restricted cash 33 84    
Cash equivalents 83 50    
Total cash and cash equivalents $ 374 $ 786 $ 199 $ 189