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Operating Expenses - Schedule of Operating Expenses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Expense [Abstract]    
Employee expenses $ 4,445 $ 4,090
Premises and equipment 158 163
Capital asset depreciation 250 241
Service fees 946 919
Amortization of intangible assets 156 137
Impairment of intangible assets 11 15
Other expenses 1,435 1,468
Total operating expenses 7,401 7,033
Employee Expenses [Abstract]    
Salaries, bonus, employee benefits 3,879 3,497
Share-based payments (Note 19) 540 549
Other personnel costs 26 44
Total employee expenses $ 4,445 $ 4,090