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Accounting and Reporting Changes - Schedule of Financial Liabilities Under IAS 39 (Detail) - CAD ($)
$ in Millions
Jan. 01, 2023
Dec. 31, 2022
Amortized cost [member] | IFRS 9 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
Impact of classification and measurement changes $ 8,304  
IFRS 9 Total carrying value 78,125  
Amortized cost [member] | IAS 39 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IAS 39 Total carrying value   $ 69,821
Investment contract liabilities [member] | FVTPL [member] | IFRS 9 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
Impact of classification and measurement changes 2  
IFRS 9 Total carrying value 798  
Investment contract liabilities [member] | FVTPL [member] | IAS 39 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IAS 39 Total carrying value   796
Investment contract liabilities [member] | Amortized cost [member] | IFRS 9 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
Impact of classification and measurement changes 6,829  
IFRS 9 Total carrying value 9,281  
Investment contract liabilities [member] | Amortized cost [member] | IAS 39 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IAS 39 Total carrying value   2,452
Deposits from bank clients [member] | Amortized cost [member] | IFRS 9 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IFRS 9 Total carrying value 22,507  
Deposits from bank clients [member] | Amortized cost [member] | IAS 39 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IAS 39 Total carrying value   22,507
Derivative Liabilities [member] | FVTPL [member] | IFRS 9 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IFRS 9 Total carrying value 14,289  
Derivative Liabilities [member] | FVTPL [member] | IAS 39 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IAS 39 Total carrying value   14,289
Other Liabilities [member] | Amortized cost [member] | IFRS 9 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
Impact of classification and measurement changes 1,473  
IFRS 9 Total carrying value 18,894  
Other Liabilities [member] | Amortized cost [member] | IAS 39 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IAS 39 Total carrying value   17,421
Long-term borrowings [member] | Amortized cost [member] | IFRS 9 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IFRS 9 Total carrying value 6,234  
Long-term borrowings [member] | Amortized cost [member] | IAS 39 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IAS 39 Total carrying value   6,234
Capital Instruments [member] | Amortized cost [member] | IFRS 9 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IFRS 9 Total carrying value $ 6,122  
Capital Instruments [member] | Amortized cost [member] | IAS 39 [Member]    
Disclosure of financial liabilities at date of initial application of IFRS 9 [line items]    
IAS 39 Total carrying value   $ 6,122