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Related Party Transactions - Summary of Key Management Compensation (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [abstract]      
Salaries, Director Fees and Other Short-Term Benefits $ 40 $ 69 $ 21
Post-Employment Benefits 4 4 3
Stock-Based Compensation 140 72 15
Other Incentive Benefits 0 4 1
Termination Benefits 3 3 6
Total compensation paid or payable $ 187 $ 152 $ 46