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Accounting and Reporting Changes - Additional Information (Detail) - CAD ($)
Jan. 01, 2023
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Disclosure of changes in accounting estimates [line items]          
Allowance account for credit losses of financial assets   $ 929,000,000 $ 724,000,000    
Equity   48,727,000,000 48,226,000,000 $ 46,892,000,000  
Notional amount   440,077,000,000 395,957,000,000    
Debt securities [member]          
Disclosure of changes in accounting estimates [line items]          
Reclassification of financial assets out of measured at fair value through profit or loss into measured at fair value through other comprehensive income $ 184,000,000,000        
IFRS 9 [Member]          
Disclosure of changes in accounting estimates [line items]          
Accumulated other comprehensive income amount cost of hedging 22,000,000        
Accumulated other comprehensive income other reclassifications 0        
Allowance account for credit losses of financial assets 724,000,000        
Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | IFRS 9 [Member]          
Disclosure of changes in accounting estimates [line items]          
Notional amount $ 232,637,000,000        
Shareholders and other equity holders retained earnings [Member]          
Disclosure of changes in accounting estimates [line items]          
Equity   4,819,000,000 3,538,000,000   $ 9,656,000,000
Shareholders and other equity holders retained earnings [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | IFRS 17 And IFRS 9 [Member]          
Disclosure of changes in accounting estimates [line items]          
Equity   409,000,000 10,645,000,000    
Accumulated other comprehensive income [member]          
Disclosure of changes in accounting estimates [line items]          
Equity   13,811,000,000 14,261,000,000   $ 5,963,000,000
Accumulated other comprehensive income [member] | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | IFRS 17 And IFRS 9 [Member]          
Disclosure of changes in accounting estimates [line items]          
AOCI Balances   $ 408,000,000 $ 16,916,000,000