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ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
ACCOUNTS RECEIVABLE AND OTHER    
Trade accounts receivable, net of allowance of nil $ 31 $ 44
Imbalance receivable from affiliates 1 2
Other 1 2
Accounts receivable and other $ 33 $ 48