Change in Non-Cash Working Capital Balances Related to Operations (Tables)

12 Months Ended

Dec. 31, 2020

Supplemental Cash Flow Elements [Abstract]

Changes In Non-cash Working Capital Balances Related To Operations

(in millions of Canadian dollars)	2020		2019		2018
(Use) source of cash:
Accounts receivable, net	$	(61)	$	27	$	(107)
Materials and supplies	(15)		(8)		(11)
Other current assets	(5)		(24)		30
Accounts payable and accrued liabilities	(308)		(21)		153
Change in non-cash working capital	$	(389)	$	(26)	$	65