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Related Parties - Summary of Compensation of Key Management Personnel (Detail) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Compensation Of Key Management Personnel [abstract]    
Short-term employee benefits CAD 44 CAD 33
Post-employment benefits 3 3
Share-based payments 43 44
Termination benefits 6 4
Other long-term benefits 2 3
Total CAD 98 CAD 87