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CHANGE IN OPERATING WORKING CAPITAL (Tables)
 3 Months Ended
Mar. 31, 2020
Supplemental Cash Flow Elements [Abstract]  
Schedule of change in operating working capital
(unaudited)
 
Three months ended March 31,
(millions of dollars)
 
2020
 
2019
Change in accounts receivable and other (a)
 
3

 
7

Change in inventories
 
(1
)
 
(1
)
Change in other current assets
 
3

 
2

Change in accounts payable and accrued liabilities (a)
 
(3
)
 
(4
)
Change in accounts payable to affiliates
 
(2
)
 
1

Change in accrued interest
 
9

 
8

Change in operating working capital
 
9

 
13

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