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Securities - Schedule of Unrealized Gains and Losses (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of financial assets [line items]    
FVOCI Securities $ 113,209 $ 93,702
Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 112,197 93,728
Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,369 660
Gross Unrealized Losses [member]    
Disclosure of financial assets [line items]    
FVOCI Securities (357) (686)
Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 113,209 93,702
Canadian federal government [member] | Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 44,894 33,892
Canadian federal government [member] | Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 443 303
Canadian federal government [member] | Gross Unrealized Losses [member]    
Disclosure of financial assets [line items]    
FVOCI Securities (2) (18)
Canadian federal government [member] | Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 45,335 34,177
Canadian Provincial And Municipal Governments [member] | Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 5,525 5,939
Canadian Provincial And Municipal Governments [member] | Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 132 82
Canadian Provincial And Municipal Governments [member] | Gross Unrealized Losses [member]    
Disclosure of financial assets [line items]    
FVOCI Securities (13) (25)
Canadian Provincial And Municipal Governments [member] | Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 5,644 5,996
U.S. federal government [member] | Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 20,515 17,033
U.S. federal government [member] | Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 327 100
U.S. federal government [member] | Gross Unrealized Losses [member]    
Disclosure of financial assets [line items]    
FVOCI Securities (33) (168)
U.S. federal government [member] | Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 20,809 16,965
U.S. states, municipalities and agencies [member] | Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 5,622 5,125
U.S. states, municipalities and agencies [member] | Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 77 24
U.S. states, municipalities and agencies [member] | Gross Unrealized Losses [member]    
Disclosure of financial assets [line items]    
FVOCI Securities (65) (81)
U.S. states, municipalities and agencies [member] | Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 5,634 5,068
Other governments [member] | Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 4,039 5,643
Other governments [member] | Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 35 20
Other governments [member] | Gross Unrealized Losses [member]    
Disclosure of financial assets [line items]    
FVOCI Securities (9) (7)
Other governments [member] | Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 4,065 5,656
NHA MBS, U.S. agency MBS and CMO [member] | Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities [1] 26,946 21,570
NHA MBS, U.S. agency MBS and CMO [member] | Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 291 58
NHA MBS, U.S. agency MBS and CMO [member] | Gross Unrealized Losses [member]    
Disclosure of financial assets [line items]    
FVOCI Securities (222) (335)
NHA MBS, U.S. agency MBS and CMO [member] | Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 27,015 21,293
Corporate debt [member] | Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 4,491 4,391
Corporate debt [member] | Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 37 31
Corporate debt [member] | Gross Unrealized Losses [member]    
Disclosure of financial assets [line items]    
FVOCI Securities (13) (52)
Corporate debt [member] | Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 4,515 4,370
Corporate equity [member] | Cost/Amortized cost [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 165 135
Corporate equity [member] | Gross Unrealized Gains [member]    
Disclosure of financial assets [line items]    
FVOCI Securities 27 42
Corporate equity [member] | Fair value [member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 192 $ 177
[1] These amounts are either supported by insured mortgages or issued by U.S. agencies and government-sponsored enterprises. NHA refers to the National Housing Act, MBS refers to mortgage-backed securities and CMO refers to collateralized mortgage obligations.