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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Classes Of Employee Benefits Expense [Abstract]      
Salaries, Bonuses and Other Short-Term Employee Benefits $ 605 $ 567 $ 580
Post-Employment Benefits 33 29 30
Stock-Based Compensation Expense 49 67 9
Other Long-Term Incentive Benefits (4) 31  
Termination Benefits 9 6 63
Employee Salaries and Benefit Expenses $ 692 $ 700 $ 682