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CHANGE IN OPERATING WORKING CAPITAL
 6 Months Ended
Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]  
CHANGE IN OPERATING WORKING CAPITAL CHANGE IN OPERATING WORKING CAPITAL
(unaudited)Six months ended June 30,
(millions of dollars)20202019
Change in accounts receivable and other (a)
6  15  
Change in inventories—  (1) 
Change in other current assets3  3  
Change in accounts payable and accrued liabilities (a)
—  (12) 
Change in accounts payable to affiliates(2) —  
Change in accrued interest(1) (1) 
Change in operating working capital6  4  
(a) Excludes certain non-cash items primarily related to capital accruals and credits.