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Other Assets (Details) - CAD
CAD in Millions
Dec. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Long-term materials CAD 20 CAD 30
Prepaid leases 9 9
Unamortized fees on credit facility 6 9
Contracted customer incentives 5 9
Long-term receivables 2 28
Other 21 32
Total other assets CAD 63 CAD 117