CHANGE IN OPERATING WORKING CAPITAL (Tables)

12 Months Ended

Dec. 31, 2020

Increase (Decrease) in Operating Capital [Abstract]

Schedule of change in operating working capital

Year Ended December 31 (millions of dollars)	2020	2019	2018
Change in accounts receivable and other	1	9	(6)
Change in inventory	(1)	(2)	—
Change in other current assets	—	—	(1)
Change in accounts payable and accrued liabilities (a)	5	(11)	3
Change in accounts payable to affiliates	(1)	2	1
Change in accrued interest	—	(1)	—
Change in operating working capital	4	(3)	(3)

(a)Excludes certain non-cash items primarily related to capital accruals and credits.