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Loans and Allowance for Credit Losses - Summary of Credit Risk Exposures for Loans Carried at Amortized Cost, FVOCI or FVTPL (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure of credit risk exposure [line items] |  |
ACL | $ 5,739 | $ 4,936
Residential mortgages [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 195,787 | 190,829
Residential mortgages [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 196,033 | 191,080
ACL | 246 | 251
Residential mortgages [member] | Gross carrying amount [member] | Default and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 903 | 657
Residential mortgages [member] | Gross carrying amount [member] | Exceptionally low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1 | 1
Residential mortgages [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 111,143 | 92,361
Residential mortgages [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 53,199 | 67,191
Residential mortgages [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 13,761 | 12,731
Residential mortgages [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 3,272 | 2,890
Residential mortgages [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 13,754 | 15,249
Consumer installment and other personal loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 91,867 | 91,889
Consumer installment and other personal loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 92,741 | 92,687
ACL | 874 | 798
Consumer installment and other personal loans [member] | Gross carrying amount [member] | Default and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 627 | 577
Consumer installment and other personal loans [member] | Gross carrying amount [member] | Exceptionally low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 9,985 | 9,307
Consumer installment and other personal loans [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 21,997 | 21,369
Consumer installment and other personal loans [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 28,920 | 30,700
Consumer installment and other personal loans [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 12,557 | 12,931
Consumer installment and other personal loans [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 2,834 | 2,806
Consumer installment and other personal loans [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 15,821 | 14,997
Credit Card Loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 11,997 | 13,030
Credit Card Loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 12,649 | 13,612
ACL | 652 | 582
Credit Card Loans [member] | Gross carrying amount [member] | Exceptionally low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1,643 | 1,660
Credit Card Loans [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 2,133 | 2,167
Credit Card Loans [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1,926 | 2,170
Credit Card Loans [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 4,741 | 5,368
Credit Card Loans [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1,824 | 1,668
Credit Card Loans [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 382 | 579
Business and government loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 378,221 | 382,627
Business and government loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 381,499 | 385,352
ACL | 3,278 | 2,725
Business and government loans [member] | Gross carrying amount [member] | Default and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 5,561 | 4,609
Business and government loans [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 192,580 | 195,179
Business and government loans [member] | Gross carrying amount [member] | Sub investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 161,769 | 162,791
Business and government loans [member] | Gross carrying amount [member] | Watch list [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 21,589 | 22,773
Loan commitments and financial guarantee contracts issued [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 293,646 | 283,360
Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
ACL | 689 | 580
Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Default and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 1,660 | 1,373
Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 204,457 | 198,919
Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Sub investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 79,126 | 74,824
Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Watch list [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 9,092 | 8,824
Gross Total Loans And Acceptances [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 682,922 | 682,731
Net Total Loans And Acceptances [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 677,872 | 678,375
Gross commitments and financial guarantee contracts [Member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 294,335 | 283,940
Stage One [member] | Residential mortgages [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 180,482 | 160,663
Stage One [member] | Residential mortgages [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 180,538 | 160,719
ACL | 56 | 56
Stage One [member] | Residential mortgages [member] | Gross carrying amount [member] | Exceptionally low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1 | 1
Stage One [member] | Residential mortgages [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 110,299 | 86,730
Stage One [member] | Residential mortgages [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 50,148 | 52,111
Stage One [member] | Residential mortgages [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 7,048 | 7,402
Stage One [member] | Residential mortgages [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 240 | 268
Stage One [member] | Residential mortgages [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 12,802 | 14,207
Stage One [member] | Consumer installment and other personal loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 80,475 | 78,286
Stage One [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 80,657 | 78,469
ACL | 182 | 183
Stage One [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Exceptionally low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 9,984 | 9,162
Stage One [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 21,962 | 20,466
Stage One [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 26,238 | 26,125
Stage One [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 6,991 | 7,405
Stage One [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 670 | 789
Stage One [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 14,812 | 14,522
Stage One [member] | Credit Card Loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 9,895 | 11,495
Stage One [member] | Credit Card Loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 10,020 | 11,656
ACL | 125 | 161
Stage One [member] | Credit Card Loans [member] | Gross carrying amount [member] | Exceptionally low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1,643 | 1,660
Stage One [member] | Credit Card Loans [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 2,129 | 2,166
Stage One [member] | Credit Card Loans [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1,846 | 2,110
Stage One [member] | Credit Card Loans [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 3,550 | 4,544
Stage One [member] | Credit Card Loans [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 592 | 746
Stage One [member] | Credit Card Loans [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 260 | 430
Stage One [member] | Business and government loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 327,143 | 338,950
Stage One [member] | Business and government loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 327,899 | 339,693
ACL | 756 | 743
Stage One [member] | Business and government loans [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 188,707 | 191,742
Stage One [member] | Business and government loans [member] | Gross carrying amount [member] | Sub investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 139,069 | 147,713
Stage One [member] | Business and government loans [member] | Gross carrying amount [member] | Watch list [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 123 | 238
Stage One [member] | Loan commitments and financial guarantee contracts issued [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 268,056 | 266,133
Stage One [member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
ACL | 256 | 235
Stage One [member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 202,913 | 198,132
Stage One [member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Sub investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 65,393 | 68,177
Stage One [member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Watch list [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 6 | 59
Stage One [member] | Gross Total Loans And Acceptances [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 599,114 | 590,537
Stage One [member] | Net Total Loans And Acceptances [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 597,995 | 589,394
Stage One [member] | Gross commitments and financial guarantee contracts [Member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 268,312 | 266,368
Stage Two [Member] | Residential mortgages [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 14,414 | 29,519
Stage Two [Member] | Residential mortgages [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 14,592 | 29,704
ACL | 178 | 185
Stage Two [Member] | Residential mortgages [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 844 | 5,631
Stage Two [Member] | Residential mortgages [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 3,051 | 15,080
Stage Two [Member] | Residential mortgages [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 6,713 | 5,329
Stage Two [Member] | Residential mortgages [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 3,032 | 2,622
Stage Two [Member] | Residential mortgages [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 952 | 1,042
Stage Two [Member] | Consumer installment and other personal loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 10,925 | 13,194
Stage Two [Member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 11,457 | 13,641
ACL | 532 | 447
Stage Two [Member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Exceptionally low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1 | 145
Stage Two [Member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 35 | 903
Stage Two [Member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 2,682 | 4,575
Stage Two [Member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 5,566 | 5,526
Stage Two [Member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 2,164 | 2,017
Stage Two [Member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1,009 | 475
Stage Two [Member] | Credit Card Loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 2,102 | 1,535
Stage Two [Member] | Credit Card Loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 2,629 | 1,956
ACL | 527 | 421
Stage Two [Member] | Credit Card Loans [member] | Gross carrying amount [member] | Very low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 4 | 1
Stage Two [Member] | Credit Card Loans [member] | Gross carrying amount [member] | Low probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 80 | 60
Stage Two [Member] | Credit Card Loans [member] | Gross carrying amount [member] | Medium probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1,191 | 824
Stage Two [Member] | Credit Card Loans [member] | Gross carrying amount [member] | High probability of default [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 1,232 | 922
Stage Two [Member] | Credit Card Loans [member] | Gross carrying amount [member] | Not Rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 122 | 149
Stage Two [Member] | Business and government loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 46,319 | 39,543
Stage Two [Member] | Business and government loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 48,039 | 41,050
ACL | 1,720 | 1,507
Stage Two [Member] | Business and government loans [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 3,873 | 3,437
Stage Two [Member] | Business and government loans [member] | Gross carrying amount [member] | Sub investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 22,700 | 15,078
Stage Two [Member] | Business and government loans [member] | Gross carrying amount [member] | Watch list [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 21,466 | 22,535
Stage Two [Member] | Loan commitments and financial guarantee contracts issued [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 23,986 | 15,932
Stage Two [Member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
ACL | 377 | 267
Stage Two [Member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 1,544 | 787
Stage Two [Member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Sub investment grade [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 13,733 | 6,647
Stage Two [Member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Watch list [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 9,086 | 8,765
Stage Two [Member] | Gross Total Loans And Acceptances [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 76,717 | 86,351
Stage Two [Member] | Net Total Loans And Acceptances [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 73,760 | 83,791
Stage Two [Member] | Gross commitments and financial guarantee contracts [Member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 24,363 | 16,199
Stage three [member] | Residential mortgages [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 891 | 647
Stage three [member] | Residential mortgages [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 903 | 657
ACL | 12 | 10
Stage three [member] | Residential mortgages [member] | Gross carrying amount [member] | Default and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 903 | 657
Stage three [member] | Consumer installment and other personal loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 467 | 409
Stage three [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 627 | 577
ACL | 160 | 168
Stage three [member] | Consumer installment and other personal loans [member] | Gross carrying amount [member] | Default and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 627 | 577
Stage three [member] | Business and government loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 4,759 | 4,134
Stage three [member] | Business and government loans [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 5,561 | 4,609
ACL | 802 | 475
Stage three [member] | Business and government loans [member] | Gross carrying amount [member] | Default and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 5,561 | 4,609
Stage three [member] | Loan commitments and financial guarantee contracts issued [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 1,604 | 1,295
Stage three [member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
ACL | 56 | 78
Stage three [member] | Loan commitments and financial guarantee contracts issued [member] | Gross carrying amount [member] | Default and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Commitments and financial guarantee contracts | 1,660 | 1,373
Stage three [member] | Gross Total Loans And Acceptances [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 7,091 | 5,843
Stage three [member] | Net Total Loans And Acceptances [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | 6,117 | 5,190
Stage three [member] | Gross commitments and financial guarantee contracts [Member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk exposure for loans | $ 1,660 | $ 1,373

X
- Definition Allowance for credit losses on financial assets. + References No definition available. + Details
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Namespace Prefix: | bmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Exposure to credit risk on loans or receivables. + References No definition available. + Details
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Namespace Prefix: | bmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
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