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Change in non-cash working capital balances related to operations
 12 Months Ended
Dec. 31, 2023
Supplemental Cash Flow Elements [Abstract]  
Change in non-cash working capital balances related to operations Change in non-cash working capital balances related to operations
For the year ended December 31 (in millions of Canadian dollars)202320222021
(Use) source of cash:
Accounts receivable, net$(317)$(147)$32 
Materials and supplies1 (27)(14)
Other current assets(49)(13)24 
Accounts payable and accrued liabilities57 95 (108)
Change in non-cash working capital balances related to operations$(308)$(92)$(66)