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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents [abstract]        
Cash $ 8 $ 6    
Cash equivalents(1) 184 198    
Total cash and cash equivalents $ 192 $ 204 $ 99 $ 78