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
Apr. 30, 2026
Jan. 31, 2026
Oct. 31, 2025
Disclosure of financial assets [line items]      
Cost $ 125,851 $ 117,126 $ 122,993
Gross unrealized gains 738 1,342 1,661
Gross unrealized losses 1,098 901 922
Fair value 125,491 117,567 123,732
Canadian federal government issued or guaranteed debt [member]      
Disclosure of financial assets [line items]      
Cost 23,492 22,078 22,815
Gross unrealized gains 107 218 359
Gross unrealized losses 156 87 64
Fair value 23,443 22,209 23,110
Canadian provincial and municipal debt [member]      
Disclosure of financial assets [line items]      
Cost 24,000 21,037 20,490
Gross unrealized gains 144 281 430
Gross unrealized losses 151 78 77
Fair value 23,993 21,240 20,843
U.S. treasury and other U.S. agency debt [member]      
Disclosure of financial assets [line items]      
Cost 47,400 45,372 49,111
Gross unrealized gains 242 418 483
Gross unrealized losses 552 485 558
Fair value 47,090 45,305 49,036
Other foreign government debt [member]      
Disclosure of financial assets [line items]      
Cost 27,698 25,766 27,570
Gross unrealized gains 230 397 358
Gross unrealized losses 215 231 202
Fair value 27,713 25,932 27,726
Other debt [member]      
Disclosure of financial assets [line items]      
Cost 3,261 2,873 3,007
Gross unrealized gains 15 28 31
Gross unrealized losses 24 20 21
Fair value $ 3,252 $ 2,881 $ 3,017