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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents [abstract]        
Cash $ 467 $ 294    
Cash equivalents 232 150    
Restricted cash 128 96    
Total cash and cash equivalents $ 827 $ 540 $ 374 $ 786