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Employee Salaries and Benefit Expenses - Summary of Employee Salaries and Benefit Expenses (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Salaries And Employee Benefits [Abstract]      
Salaries, Bonuses and Other Short-Term Employee Benefits $ 1,327 $ 605 $ 567
Post-Employment Benefits 89 33 29
Stock-Based Compensation 159 49 67
Other Incentive Benefits Expense (Recovery) 201 (4) 31
Termination Benefits 180 9 6
Employee Salaries and Benefit Expenses $ 1,956 $ 692 $ 700