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Financial instruments - disclosures (Tables)
 12 Months Ended
Oct. 31, 2022
Text Block [Abstract]  
Schedule of Balance Sheet Exposure Credit Risk under Different Basel Approaches
$ millions, as at October 31
 
AIRB
approach
 
 
Standardized
approach
 
 
Other
credit risk 
(1)
 
 
Total
subject to
credit risk
 
 
Not
subject to
credit risk
 
  
Total
consolidated
balance sheet
 
2022
  
Cash and deposits with banks
  
$
47,670
 
  
$
13,724
 
  
$
2,458
 
  
$
63,852
 
  
$
9
 
   
$
63,861
 
   
Securities
  
 
110,695
 
  
 
14,678
 
  
 
–
 
  
 
125,373
 
  
 
50,506
 
   
 
175,879
 
   
Cash collateral on securities borrowed
  
 
15,320
 
  
 
6
 
  
 
–
 
  
 
15,326
 
  
 
–
 
   
 
15,326
 
   
Securities purchased under resale agreements
  
 
69,213
 
  
 
–
 
  
 
–
 
  
 
69,213
 
  
 
–
 
   
 
69,213
 
   
Loans
  
 
457,858
 
  
 
57,650
 
  
 
1,663
 
  
 
517,171
 
  
 
2,985
 
   
 
520,156
 
   
Allowance for credit losses
  
 
(2,317
)
  
 
(756
)
  
 
–
 
  
 
(3,073
)
  
 
–
 
   
 
(3,073
)
   
Derivative instruments
  
 
43,031
 
  
 
4
 
  
 
–
 
  
 
43,035
 
  
 
–
 
   
 
43,035
 
   
Customers’ liability under acceptances
  
 
11,247
 
  
 
327
 
  
 
–
 
  
 
11,574
 
  
 
–
 
   
 
11,574
 
   
Other assets
  
 
28,951
 
  
 
423
 
  
 
7,834
 
  
 
37,208
 
  
 
10,418
 
   
 
47,626
 
   
Total credit exposures
  
$
781,668
 
  
$
86,056
 
  
$
11,955
 
  
$
879,679
 
  
$
63,918
 
   
$
943,597
 
2021
  
Total credit exposures
   $     688,150     $     69,886     $     11,275     $     769,311     $     68,372      $     837,683  
 
(1)
Includes credit risk exposures arising from other assets that are subject to the credit risk framework but are not included in the standardized or AIRB frameworks, including other balance sheet assets which are risk-weighted at 100%, significant investments in the capital of non-financial institutions, and amounts below the thresholds for capital deduction that are risk-weighted at 250%.