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Related Parties - Summary of Compensation of Key Management Personnel (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Compensation Of Key Management Personnel [abstract]    
Short-term employee benefits $ 65 $ 69
Post-employment benefits 5 5
Share-based payments 57 57
Termination benefits  
Other long-term benefits 2 3
Total $ 129 $ 134