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Change in Non-Cash Working Capital Balances Related to Operations
 12 Months Ended
Dec. 31, 2015
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
(in millions of Canadian dollars)
2015

2014

2013

Source (use) of cash:



Accounts receivable, net
$
80

$
(112
)
$
(29
)
Materials and supplies
15

7

(19
)
Other current assets
55

(75
)
5

Accounts payable and accrued liabilities
125

56

41

Change in non-cash working capital
$
275

$
(124
)
$
(2
)