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ACCOUNTS RECEIVABLE AND OTHER
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
ACCOUNTS RECEIVABLE AND OTHER ACCOUNTS RECEIVABLE AND OTHER
December 31 (millions of dollars)
20202019
Trade accounts receivable, net of immaterial allowance for doubtful accounts36 37 
Receivable from affiliates1 — 
Other3 6 
40 43