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Other Assets (Tables)
12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in millions of Canadian dollars)
2017

2016

Long-term materials
$
24

$
22

Prepaid leases
5

6

Unamortized fees on credit facility
5

7

Contracted customer incentives
11

2

Long-term receivables
1

2

Other
23

18

Total other assets
$
69

$
57