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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
    Goodwill and intangible assets
 
 
Intangible assets
 
(in millions of Canadian dollars)
Goodwill

Cost

Accumulated
amortization

Net
carrying
amount

Total goodwill and intangible assets

Balance at December 31, 2014
$
164

$
22

$
(10
)
$
12

$
176

Amortization


(1
)
(1
)
(1
)
Foreign exchange impact
31


2

2

33

Additions
3




3

Balance at December 31, 2015
$
198

$
22

$
(9
)
$
13

$
211

Amortization


(1
)
(1
)
(1
)
Foreign exchange impact
(7
)

(1
)
(1
)
(8
)
Balance at December 31, 2016
$
191

$
22

$
(11
)
$
11

$
202