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Employee Compensation - Share-Based Compensation - Additional Information (Detail) $ / shares in Units, shares in Millions | 12 Months Ended
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Oct. 31, 2025 CAD ($) $ / shares shares | Oct. 31, 2024 CAD ($) $ / shares shares
Disclosure of Sharebased Payment [Line Items] |  |
Weighted average fair value of options granted | $ / shares | $ 18.46 | $ 15.33
Other liabilities | $ 37,549,000,000 | $ 36,720,000,000
Weighted average exercise price, options | $ / shares | $ 141 | $ 118.5
Employee Stock Option Plan [Member] |  |
Disclosure of Sharebased Payment [Line Items] |  |
Employee compensation expense | $ 16,000,000 | $ 18,000,000
Share purchase plan [member] |  |
Disclosure of Sharebased Payment [Line Items] |  |
Employee compensation expense | $ 48,000,000 | $ 49,000,000
Percentage of employer matching contribution for contribution up to 6% | 50.00% |
Percentage of employee contribution towards share ownership plans | 6.00% |
Share purchase plan contribution vesting period | 2 years |
Individual gross salary for employees contribution | $ 75,000 |
Description of employee ownership plan contribution | 50% of employee contributions up to 6% of their individual gross salary to a maximum of $75,000. Our contributions during the first two years vest after two years of participation in the plan, with subsequent contributions vesting immediately. |
Common shares held in plan | shares | 17.4 | 18.1
Mid-Term incentive plan [member] |  |
Disclosure of Sharebased Payment [Line Items] |  |
Employee compensation expense | $ 1,525,000,000 | $ 1,037,000,000
Units granted | 5,800,000 | 6,700,000
Weighted average fair value of options granted | $ / shares | $ 132.73 | $ 111.66
Gains on hedge contract | $ 672,000,000 | $ 178,000,000
Mid-term incentive plan units outstanding | 17,400,000 | 18,400,000
Intrinsic value of share other than options vested | $ 2,352,000,000 | $ 1,663,000,000
Mid-Term incentive plan [member] | Equity contracts [member] |  |
Disclosure of Sharebased Payment [Line Items] |  |
Employee compensation expense | 853,000,000 | 859,000,000
Deferred incentive plans [member] |  |
Disclosure of Sharebased Payment [Line Items] |  |
Employee compensation expense | $ 262,000,000 | $ 139,000,000
Mid-term incentive plan units outstanding | 5,000,000 | 5,100,000
Deferred incentive plan units granted | 300,000 | 300,000
Weighted average fair value at measurement date | $ 140.64 | $ 121.18
Other liabilities | 874,000,000 | 655,000,000
Gains on derivatives | 232,000,000 | 107,000,000
Gains resulted in net employee compensation expense | 30,000,000 | 32,000,000
Share ownership arrangements [Member] | Assets 1 [member] | Compensation trusts [member] |  |
Disclosure of Sharebased Payment [Line Items] |  |
Assets recognised | 3,026,000,000 | 2,299,000,000
Deferred compensation arrangements [member] | Compensation trusts [member] |  |
Disclosure of Sharebased Payment [Line Items] |  |
Consolidated Trust Assets | 297,000,000 | 313,000,000
Deferred compensation arrangements [member] | Assets 1 [member] | Compensation trusts [member] |  |
Disclosure of Sharebased Payment [Line Items] |  |
Assets recognised | $ 259,000,000 | $ 221,000,000

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