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Related Party Transactions Disclosure of transactions between related parties (Details) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party [Abstract]      
Total compensation CAD 24 CAD 20 CAD 9
Short-term employee benefits 14 8 8
Post-employment benefits 2 2 2
Termination benefits 0 0 1
Share-based payments CAD 8 CAD 10 CAD (2)