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Changes in Accounting Policies - Narrative (Details) - CAD ($)
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of voluntary change in accounting policy [line items]      
Right-of-use assets $ 770,000,000   $ 0
Lease liabilities 902,000,000   0
Operating leases     1,056,000,000
Financial assets 152,785,000,000   143,061,000,000
IFRS 16      
Disclosure of voluntary change in accounting policy [line items]      
Right-of-use assets   $ 744,000,000  
Lease liabilities   880,000,000  
De-recognition of deferred balances   105,000,000  
Deferred tax impact   $ 9,000,000  
Weighted average incremental borrowing rate applied to lease liabilities at date of initial application of IFRS 16   3.30%  
IFRS 16 | Restatement Adjustment      
Disclosure of voluntary change in accounting policy [line items]      
Reduction to retained earnings   $ 22,000,000  
Debt securities | Credit risk      
Disclosure of voluntary change in accounting policy [line items]      
Financial assets 81,606,000,000   74,443,000,000
Debt securities | Credit risk | Available-for-sale      
Disclosure of voluntary change in accounting policy [line items]      
Financial assets 13,712,000,000   13,041,000,000
Mortgages and loans(1)      
Disclosure of voluntary change in accounting policy [line items]      
Financial assets $ 48,222,000,000   $ 46,822,000,000