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Change in Non-Cash Working Capital Balances Related to Operations (Tables)
 12 Months Ended
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]  
Changes In Non-cash Working Capital Balances Related To Operations
(in millions of Canadian dollars)
2016

2015

2014

Source (use) of cash:



Accounts receivable, net
$
44

$
80

$
(112
)
Materials and supplies
14

15

7

Other current assets
(18
)
55

(75
)
Accounts payable and accrued liabilities
(95
)
125

56

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

$
(124
)