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Change in Non-Cash Working Capital Balances Related to Operations (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Changes In Non-cash Working Capital Balances Related To Operations
(in millions of Canadian dollars)
2017

2016

2015

(Use) source of cash:
 
 
 
Accounts receivable, net
$
(91
)
$
44

$
80

Materials and supplies
9

14

15

Other current assets
(26
)
(18
)
55

Accounts payable and accrued liabilities
(30
)
(95
)
125

Change in non-cash working capital
$
(138
)
$
(55
)
$
275