v3.26.1
Investment Securities - Disclosure of Unrealized Gains and Losses on Fair Value Through Other Comprehensive Income Securities (Detail) - Financial assets measured at fair value through other comprehensive income, category [member] - CAD ($)
$ in Millions
Jul. 31, 2026
Apr. 30, 2026
Oct. 31, 2025
Disclosure of financial assets [line items]      
Cost $ 129,154 $ 125,851 $ 122,993
Gross unrealized gains 496 738 1,661
Gross unrealized losses 1,584 1,098 922
Fair value 128,066 125,491 123,732
Canadian federal government issued or guaranteed debt [member]      
Disclosure of financial assets [line items]      
Cost 24,893 23,492 22,815
Gross unrealized gains 90 107 359
Gross unrealized losses 192 156 64
Fair value 24,791 23,443 23,110
Canadian provincial and municipal debt [member]      
Disclosure of financial assets [line items]      
Cost 24,258 24,000 20,490
Gross unrealized gains 93 144 430
Gross unrealized losses 256 151 77
Fair value 24,095 23,993 20,843
U.S. treasury and other U.S. agency debt [member]      
Disclosure of financial assets [line items]      
Cost 48,608 47,400 49,111
Gross unrealized gains 73 242 483
Gross unrealized losses 805 552 558
Fair value 47,876 47,090 49,036
Other foreign government debt [member]      
Disclosure of financial assets [line items]      
Cost 28,336 27,698 27,570
Gross unrealized gains 230 230 358
Gross unrealized losses 299 215 202
Fair value 28,267 27,713 27,726
Other debt [member]      
Disclosure of financial assets [line items]      
Cost 3,059 3,261 3,007
Gross unrealized gains 10 15 31
Gross unrealized losses 32 24 21
Fair value $ 3,037 $ 3,252 $ 3,017