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Designated accounting hedges - Summary of Items Designated as Hedging Instruments (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument $ 11,888,377  
Within 1 year [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 6,765,396  
Later than one year and not later than five years [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 3,285,154  
Over 5 years [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 1,837,827  
Hedging instrument [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 433,200 $ 442,430
Fair value of the hedging derivatives, Assets 4,298 2,873
Fair value of the hedging derivatives, liabilities 2,050 2,182
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness 1,890 1,620
Hedging instrument [member] | Within 1 year [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 178,495 195,424
Hedging instrument [member] | Later than one year and not later than five years [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 204,299 210,329
Hedging instrument [member] | Over 5 years [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 50,406 36,677
Cash flow hedges [member] | Hedging instrument [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 96,810 72,527
Fair value of the hedging derivatives, Assets 1,533 1,164
Fair value of the hedging derivatives, liabilities 428 377
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness 1,967 3,258
Cash flow hedges [member] | Hedging instrument [member] | Foreign Exchange Cross Currency Interest Rate Swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 40,826 29,207
Fair value of the hedging derivatives, Assets 1,383 1,008
Fair value of the hedging derivatives, liabilities 419 366
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness 686 713
Cash flow hedges [member] | Hedging instrument [member] | Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 53,148 41,233
Fair value of the hedging derivatives, liabilities 7 8
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness 568 1,625
Cash flow hedges [member] | Hedging instrument [member] | Equity swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 2,836 2,087
Fair value of the hedging derivatives, Assets 150 156
Fair value of the hedging derivatives, liabilities 2 3
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness 713 920
Cash flow hedges [member] | Hedging instrument [member] | Within 1 year [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 25,210 17,831
Cash flow hedges [member] | Hedging instrument [member] | Within 1 year [member] | Foreign Exchange Cross Currency Interest Rate Swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 21,322 14,559
Cash flow hedges [member] | Hedging instrument [member] | Within 1 year [member] | Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 1,052 1,462
Cash flow hedges [member] | Hedging instrument [member] | Within 1 year [member] | Equity swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 2,836 1,810
Cash flow hedges [member] | Hedging instrument [member] | Later than one year and not later than five years [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 68,755 53,103
Cash flow hedges [member] | Hedging instrument [member] | Later than one year and not later than five years [member] | Foreign Exchange Cross Currency Interest Rate Swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 19,504 14,648
Cash flow hedges [member] | Hedging instrument [member] | Later than one year and not later than five years [member] | Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 49,251 38,178
Cash flow hedges [member] | Hedging instrument [member] | Later than one year and not later than five years [member] | Equity swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument   277
Cash flow hedges [member] | Hedging instrument [member] | Over 5 years [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 2,845 1,593
Cash flow hedges [member] | Hedging instrument [member] | Over 5 years [member] | Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 2,845 1,593
NIFO hedges [member] | Hedging instrument [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 41,733 39,742
Fair value of the hedging derivatives, Assets 55 15
Fair value of the hedging derivatives, liabilities 107 106
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness (297) (267)
NIFO hedges [member] | Hedging instrument [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 8,934 7,658
Fair value of the hedging derivatives, Assets 55 15
Fair value of the hedging derivatives, liabilities 107 106
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness (64) (51)
NIFO hedges [member] | Hedging instrument [member] | Deposits [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 32,799 32,084
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness (233) (216)
NIFO hedges [member] | Hedging instrument [member] | Within 1 year [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 41,733 39,742
NIFO hedges [member] | Hedging instrument [member] | Within 1 year [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 8,934 7,658
NIFO hedges [member] | Hedging instrument [member] | Within 1 year [member] | Deposits [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 32,799 32,084
Fair value hedges [member] | Hedging instrument [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 294,657 330,161
Fair value of the hedging derivatives, Assets 2,710 1,694
Fair value of the hedging derivatives, liabilities 1,515 1,699
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness 220 (1,371)
Fair value hedges [member] | Hedging instrument [member] | Foreign Exchange Cross Currency Interest Rate Swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 58,556 41,491
Fair value of the hedging derivatives, Assets 2,667 1,617
Fair value of the hedging derivatives, liabilities 526 758
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness 63 51
Fair value hedges [member] | Hedging instrument [member] | Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 206,770 267,334
Fair value of the hedging derivatives, Assets 43 77
Fair value of the hedging derivatives, liabilities 988 926
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness (158) (2,116)
Fair value hedges [member] | Hedging instrument [member] | Foreign exchange Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 29,331 21,336
Fair value of the hedging derivatives, liabilities 1 15
Gains (losses) on changes in fair value used for calculating hedge ineffectiveness 315 694
Fair value hedges [member] | Hedging instrument [member] | Within 1 year [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 111,552 137,851
Fair value hedges [member] | Hedging instrument [member] | Within 1 year [member] | Foreign Exchange Cross Currency Interest Rate Swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 17,314 13,249
Fair value hedges [member] | Hedging instrument [member] | Within 1 year [member] | Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 86,092 118,011
Fair value hedges [member] | Hedging instrument [member] | Within 1 year [member] | Foreign exchange Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 8,146 6,591
Fair value hedges [member] | Hedging instrument [member] | Later than one year and not later than five years [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 135,544 157,226
Fair value hedges [member] | Hedging instrument [member] | Later than one year and not later than five years [member] | Foreign Exchange Cross Currency Interest Rate Swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 33,774 25,647
Fair value hedges [member] | Hedging instrument [member] | Later than one year and not later than five years [member] | Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 83,050 117,322
Fair value hedges [member] | Hedging instrument [member] | Later than one year and not later than five years [member] | Foreign exchange Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 18,720 14,257
Fair value hedges [member] | Hedging instrument [member] | Over 5 years [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 47,561 35,084
Fair value hedges [member] | Hedging instrument [member] | Over 5 years [member] | Foreign Exchange Cross Currency Interest Rate Swap [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 7,468 2,595
Fair value hedges [member] | Hedging instrument [member] | Over 5 years [member] | Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument 37,628 32,001
Fair value hedges [member] | Hedging instrument [member] | Over 5 years [member] | Foreign exchange Interest rate swaps [member]    
Disclosure of detailed information about hedges [line items]    
Notional amount of hedging instrument $ 2,465 $ 488