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ACCOUNTS RECEIVABLE AND OTHER
 9 Months Ended
Sep. 30, 2020
Receivables [Abstract]  
ACCOUNTS RECEIVABLE AND OTHER ACCOUNTS RECEIVABLE AND OTHER
(unaudited)  
(millions of dollars)September 30, 2020December 31, 2019
Trade accounts receivable, net of allowance of nil32 37 
Imbalance receivable from affiliates1 — 
Other1 6 
 34 43