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ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
ACCOUNTS RECEIVABLE AND OTHER    
Trade accounts receivable, net of allowance of nil $ 44 $ 40
Imbalance receivable from affiliates 2 1
Other 2 1
Accounts receivable and other 48 42
Trade accounts receivable, allowance $ 0 $ 0