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Related Parties - Summary of Compensation of Key Management Personnel (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Compensation Of Key Management Personnel [abstract]    
Short-term employee benefits $ 83 $ 73
Post-employment benefits 6 6
Share-based payments 73 73
Termination benefits 3 0
Other long-term benefits 3 3
Total $ 168 $ 155