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Change in Non-Cash Working Capital Balances Related to Operations
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Change in Non-Cash Working Capital Balances Related to Operations
(in millions of Canadian dollars)
2018

2017

2016

Source (use) of cash:
 
 
 
Accounts receivable, net
$
(107
)
$
(91
)
$
44

Materials and supplies
(11
)
9

14

Other current assets
30

(26
)
(18
)
Accounts payable and accrued liabilities
153

(30
)
(95
)
Change in non-cash working capital
$
65

$
(138
)
$
(55
)