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Loans - Summary of Undrawn Credit Facilities and Other Off Balance Sheet Exposures (Detail) - CAD ($) $ in Millions	Oct. 31, 2025	Oct. 31, 2024
Disclosure of internal credit grades [line items]
Credit exposure	$ 480,883	$ 440,411
ECL allowance	347	197
Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	477,814	429,783
Retail [member]
Disclosure of internal credit grades [line items]
ECL allowance	185	94
Retail [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	213,209	200,806
Retail [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	213,024	200,712
Retail [member] | Exceptionally Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	176,230	164,694
Retail [member] | Very Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	14,809	15,116
Retail [member] | Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	16,572	15,972
Retail [member] | Medium [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	3,957	3,543
Retail [member] | High [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	967	864
Retail [member] | Default [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	46	43
Retail [member] | Not Rated [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	628	574
Business and government [member]
Disclosure of internal credit grades [line items]
ECL allowance	162	103
Business and government [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	264,952	229,174
Business and government [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	264,790	229,071
Business and government [member] | Investment grade [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	180,075	157,131
Business and government [member] | Non-investment grade [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	82,568	69,806
Business and government [member] | Watch list [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	1,103	906
Business and government [member] | Default [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	217	123
Business and government [member] | Not Rated [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	989	1,208
Stage 1 [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member]
Disclosure of internal credit grades [line items]
ECL allowance	147	96
Stage 1 [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	469,020	422,227
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member]
Disclosure of internal credit grades [line items]
ECL allowance	54	42
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	208,758	197,830
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	208,704	197,788
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Exceptionally Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	176,040	164,577
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Very Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	14,237	15,112
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	14,867	14,988
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Medium [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	2,449	2,263
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | High [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	545	325
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	620	565
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member]
Disclosure of internal credit grades [line items]
ECL allowance	93	54
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	260,409	224,493
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	260,316	224,439
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Investment grade [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	179,496	156,560
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Non-investment grade [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	79,909	66,788
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Watch list [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	57	28
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	947	1,117
Stage 2 [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]
Disclosure of internal credit grades [line items]
ECL allowance	193	92
Stage 2 [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	8,538	7,399
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member]
Disclosure of internal credit grades [line items]
ECL allowance	131	52
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	4,405	2,933
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	4,274	2,881
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Exceptionally Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	190	117
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Very Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	572	4
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Low [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	1,705	984
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Medium [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	1,508	1,280
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | High [Member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	422	539
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	8	9
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member]
Disclosure of internal credit grades [line items]
ECL allowance	62	40
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	4,326	4,558
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	4,264	4,518
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Investment grade [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	579	571
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Non-investment grade [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	2,659	3,018
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Watch list [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	1,046	878
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	42	91
Stage 3 [member] | Financial instruments credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	256	157
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	46	43
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	46	43
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Default [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	46	43
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member]
Disclosure of internal credit grades [line items]
ECL allowance	7	9
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	217	123
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Net credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	210	114
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Default [member] | Gross credit exposure [member]
Disclosure of internal credit grades [line items]
Credit exposure	217	123
Stage 3 [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]
Disclosure of internal credit grades [line items]
ECL allowance	$ 7	$ 9

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- Definition

Allowance account for credit losses of undrawn.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

The amount of the exposure to credit risk on loan commitments and financial guarantee contracts. [Refer: Loan commitments [member]; Financial guarantee contracts [member]; Credit risk [member]]

+ References

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