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Risk Management - Summary of Reconciliation of Allowance for Loan Losses (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Disclosure of credit risk exposure [Line Items]  
Beginning balance $ 724
Net re-measurement due to transfers 0
Transfer to stage 1 0
Transfer to stage 2 0
Transfer to stage 3 0
Net originations, purchases and disposals 30
Repayments 0
Changes to risk, parameters, and models 210
Foreign exchange and other adjustments (35)
Ending balance 929
Stage 1 [member]  
Disclosure of credit risk exposure [Line Items]  
Beginning balance 511
Net re-measurement due to transfers 4
Transfer to stage 1 12
Transfer to stage 2 (6)
Transfer to stage 3 (2)
Net originations, purchases and disposals 45
Repayments 0
Changes to risk, parameters, and models (71)
Foreign exchange and other adjustments (7)
Ending balance 482
Stage 2 [member]  
Disclosure of credit risk exposure [Line Items]  
Beginning balance 141
Net re-measurement due to transfers 6
Transfer to stage 1 (11)
Transfer to stage 2 28
Transfer to stage 3 (11)
Net originations, purchases and disposals 8
Repayments 0
Changes to risk, parameters, and models 48
Foreign exchange and other adjustments 7
Ending balance 210
Stage 3 [member]  
Disclosure of credit risk exposure [Line Items]  
Beginning balance 72
Net re-measurement due to transfers (10)
Transfer to stage 1 (1)
Transfer to stage 2 (22)
Transfer to stage 3 13
Net originations, purchases and disposals (23)
Repayments 0
Changes to risk, parameters, and models 233
Foreign exchange and other adjustments (35)
Ending balance $ 237