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Employee Benefits (Summary of Employee Benefit Plans' Obligations, Assets, Funded Status and Expense) (Details)
$ in Millions
12 Months Ended
Oct. 31, 2025
CAD ($)
yr
Oct. 31, 2024
CAD ($)
yr
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year $ 338  
Defined benefit obligation at end of year 261 $ 338
Other assets in the Bank's Consolidated Balance Sheet 27,988 28,181
Other liabilities in the Bank's Consolidated Balance Sheet (34,240) (51,878)
Principal Pension Plans [Member]    
Change in projected benefit obligation [Abstract]    
Service cost - benefits earned 276 217
Net interest cost (income) on net defined benefit liability (asset) (51) (83)
Remeasurement (gain) loss - financial (15) 1,155
Remeasurement gain (loss) - return on plan assets less interest income (42) (986)
Remeasurement (gain) loss - demographic 0 0
Remeasurement (gain) loss - experience 107 92
Past service cost 0 (35)
Excess (deficit) of plan assets at fair value over projected benefit obligation 0 0
Effect of asset limitation and minimum funding requirement 951 948
Other assets in the Bank's Consolidated Balance Sheet 951 948
Other liabilities in the Bank's Consolidated Balance Sheet 0 0
Net defined benefit asset (liability) 951 948
Net employee benefits expense [Abstract]    
Current service cost, net defined benefit liability (asset) 276 217
Net interest cost (income) on net defined benefit liability (asset) (51) (83)
Interest cost on asset limitation and minimum funding requirement 0 11
Past service cost 0 35
Defined benefit administrative expenses 11 9
Total expense $ 236 $ 189
Principal Pension Plans [Member] | Annual Expense [Member]    
Actuarial assumptions used [Abstract]    
Weighted-average discount rate for projected benefit obligation 4.83% 5.66%
Weighted-average rate of compensation increase 2.78% 2.78%
Principal Pension Plans [Member] | Annual Expense [Member] | Male [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 23.2 23.2
Principal Pension Plans [Member] | Annual Expense [Member] | Male [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 24.1 24.1
Principal Pension Plans [Member] | Annual Expense [Member] | Female [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 24.3 24.3
Principal Pension Plans [Member] | Annual Expense [Member] | Female [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 25.2 25.2
Principal Pension Plans [Member] | Projected Benefit Obligation [Member]    
Actuarial assumptions used [Abstract]    
Weighted-average discount rate for projected benefit obligation 4.80% 4.83%
Weighted-average rate of compensation increase 2.79% 2.78%
Principal Pension Plans [Member] | Projected Benefit Obligation [Member] | Male [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.233 23.2
Principal Pension Plans [Member] | Projected Benefit Obligation [Member] | Male [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.242 24.1
Principal Pension Plans [Member] | Projected Benefit Obligation [Member] | Female [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.244 24.3
Principal Pension Plans [Member] | Projected Benefit Obligation [Member] | Female [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.253 25.2
Principal Pension Plans [Member] | Change in projected benefit obligation [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year $ 8,470 $ 6,833
Service cost - benefits earned 276 217
Net interest cost (income) on net defined benefit liability (asset) 374 381
Remeasurement (gain) loss - financial (15) 1,155
Remeasurement (gain) loss - demographic 0 0
Remeasurement (gain) loss - experience 107 92
Members' contributions 109 112
Employer's contributions 400 355
Change in foreign currency exchange rate 0 0
Past service cost 0 35
Defined benefit obligation at end of year 8,921 8,470
Net employee benefits expense [Abstract]    
Current service cost, net defined benefit liability (asset) 276 217
Net interest cost (income) on net defined benefit liability (asset) 374 381
Past service cost 0 (35)
Principal Pension Plans [Member] | Change in projected benefit obligation [member] | Wholly or partly funded defined benefit plans [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 8,470  
Defined benefit obligation at end of year 8,921 8,470
Principal Pension Plans [Member] | Change in projected benefit obligation [member] | Wholly unfunded defined benefit plans [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 0  
Defined benefit obligation at end of year 0 0
Principal Pension Plans [Member] | Change in plan assets [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 9,418 8,220
Net interest cost (income) on net defined benefit liability (asset) (425) (464)
Remeasurement gain (loss) - return on plan assets less interest income (41) 988
Members' contributions (109) (112)
Employer's contributions 289 0
Benefits paid (400) (355)
Change in foreign currency exchange rate 0 0
Defined benefit administrative expenses (10) (11)
Defined benefit obligation at end of year 9,872 9,418
Net employee benefits expense [Abstract]    
Net interest cost (income) on net defined benefit liability (asset) (425) (464)
Principal post-retirement benefit plan [Member]    
Change in projected benefit obligation [Abstract]    
Service cost - benefits earned 6 5
Net interest cost (income) on net defined benefit liability (asset) 17 20
Remeasurement (gain) loss - financial 5 40
Remeasurement gain (loss) - return on plan assets less interest income 0 0
Remeasurement (gain) loss - demographic 0 0
Remeasurement (gain) loss - experience (1) 0
Past service cost 0 0
Excess (deficit) of plan assets at fair value over projected benefit obligation 0 0
Effect of asset limitation and minimum funding requirement (405) (397)
Other assets in the Bank's Consolidated Balance Sheet 0 0
Other liabilities in the Bank's Consolidated Balance Sheet (405) (397)
Net defined benefit asset (liability) (405) (397)
Net employee benefits expense [Abstract]    
Current service cost, net defined benefit liability (asset) 6 5
Net interest cost (income) on net defined benefit liability (asset) 17 20
Interest cost on asset limitation and minimum funding requirement 0 0
Past service cost 0 0
Defined benefit administrative expenses 0 0
Total expense $ 23 $ 25
Principal post-retirement benefit plan [Member] | Annual Expense [Member]    
Actuarial assumptions used [Abstract]    
Weighted-average discount rate for projected benefit obligation 4.80% 5.71%
Weighted-average rate of compensation increase 3.00% 3.05%
Principal post-retirement benefit plan [Member] | Annual Expense [Member] | Male [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 23.2 23.2
Principal post-retirement benefit plan [Member] | Annual Expense [Member] | Male [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 24.1 24.1
Principal post-retirement benefit plan [Member] | Annual Expense [Member] | Female [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 24.3 24.3
Principal post-retirement benefit plan [Member] | Annual Expense [Member] | Female [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 25.2 25.2
Principal post-retirement benefit plan [Member] | Projected Benefit Obligation [Member]    
Actuarial assumptions used [Abstract]    
Weighted-average discount rate for projected benefit obligation 4.70% 4.80%
Weighted-average rate of compensation increase 3.00% 3.00%
Principal post-retirement benefit plan [Member] | Projected Benefit Obligation [Member] | Male [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.233 23.2
Principal post-retirement benefit plan [Member] | Projected Benefit Obligation [Member] | Male [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.242 24.1
Principal post-retirement benefit plan [Member] | Projected Benefit Obligation [Member] | Female [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.244 24.3
Principal post-retirement benefit plan [Member] | Projected Benefit Obligation [Member] | Female [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.253 25.2
Principal post-retirement benefit plan [Member] | Change in projected benefit obligation [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year $ 397 $ 352
Service cost - benefits earned 6 5
Net interest cost (income) on net defined benefit liability (asset) 17 20
Remeasurement (gain) loss - financial 5 40
Remeasurement (gain) loss - demographic 0 0
Remeasurement (gain) loss - experience (1) 0
Members' contributions 0 0
Employer's contributions 19 20
Change in foreign currency exchange rate 0 0
Past service cost 0 0
Defined benefit obligation at end of year 405 397
Net employee benefits expense [Abstract]    
Current service cost, net defined benefit liability (asset) 6 5
Net interest cost (income) on net defined benefit liability (asset) 17 20
Past service cost 0 0
Principal post-retirement benefit plan [Member] | Change in projected benefit obligation [member] | Wholly or partly funded defined benefit plans [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 0  
Defined benefit obligation at end of year   0
Principal post-retirement benefit plan [Member] | Change in projected benefit obligation [member] | Wholly unfunded defined benefit plans [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 397  
Defined benefit obligation at end of year 405 397
Principal post-retirement benefit plan [Member] | Change in plan assets [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 0 0
Net interest cost (income) on net defined benefit liability (asset) 0 0
Remeasurement gain (loss) - return on plan assets less interest income 0 0
Members' contributions 0 0
Employer's contributions 19 20
Benefits paid (19) (20)
Change in foreign currency exchange rate 0 0
Defined benefit administrative expenses 0 0
Defined benefit obligation at end of year 0 0
Net employee benefits expense [Abstract]    
Net interest cost (income) on net defined benefit liability (asset) 0 0
Other pension plans [Member]    
Change in projected benefit obligation [Abstract]    
Service cost - benefits earned 19 15
Net interest cost (income) on net defined benefit liability (asset) 22 26
Remeasurement (gain) loss - financial 16 220
Remeasurement gain (loss) - return on plan assets less interest income (38) (177)
Remeasurement (gain) loss - demographic (14) (1)
Remeasurement (gain) loss - experience (29) 20
Past service cost (2) 0
Excess (deficit) of plan assets at fair value over projected benefit obligation (26) (21)
Effect of asset limitation and minimum funding requirement (413) (500)
Other assets in the Bank's Consolidated Balance Sheet 160 94
Other liabilities in the Bank's Consolidated Balance Sheet (599) (615)
Net defined benefit asset (liability) (439) (521)
Net employee benefits expense [Abstract]    
Current service cost, net defined benefit liability (asset) 19 15
Net interest cost (income) on net defined benefit liability (asset) 22 26
Interest cost on asset limitation and minimum funding requirement 1 3
Past service cost 2 0
Defined benefit administrative expenses 4 5
Total expense $ 48 $ 49
Other pension plans [Member] | Annual Expense [Member]    
Actuarial assumptions used [Abstract]    
Weighted-average discount rate for projected benefit obligation 5.06% 5.95%
Weighted-average rate of compensation increase 1.37% 1.35%
Other pension plans [Member] | Annual Expense [Member] | Male [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 21.9 21.9
Other pension plans [Member] | Annual Expense [Member] | Male [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 22.7 22.6
Other pension plans [Member] | Annual Expense [Member] | Female [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 23.5 23.4
Other pension plans [Member] | Annual Expense [Member] | Female [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years | yr 24.3 24.3
Other pension plans [Member] | Projected Benefit Obligation [Member]    
Actuarial assumptions used [Abstract]    
Weighted-average discount rate for projected benefit obligation 4.97% 5.06%
Weighted-average rate of compensation increase 1.39% 1.37%
Other pension plans [Member] | Projected Benefit Obligation [Member] | Male [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.220 21.9
Other pension plans [Member] | Projected Benefit Obligation [Member] | Male [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.227 22.7
Other pension plans [Member] | Projected Benefit Obligation [Member] | Female [Member] | Retiring currently at age 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.236 23.5
Other pension plans [Member] | Projected Benefit Obligation [Member] | Female [Member] | Currently aged 45 and retiring at 65 [member]    
Actuarial assumptions used [Abstract]    
Assumed life expectancy at age 65, in years 0.244 24.3
Other pension plans [Member] | Change in projected benefit obligation [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year $ 2,500 $ 2,264
Service cost - benefits earned 19 15
Net interest cost (income) on net defined benefit liability (asset) 116 128
Remeasurement (gain) loss - financial 16 220
Remeasurement (gain) loss - demographic (14) (1)
Remeasurement (gain) loss - experience (29) 20
Members' contributions 0 0
Employer's contributions 161 149
Change in foreign currency exchange rate 10 3
Past service cost 2 0
Defined benefit obligation at end of year 2,459 2,500
Net employee benefits expense [Abstract]    
Current service cost, net defined benefit liability (asset) 19 15
Net interest cost (income) on net defined benefit liability (asset) 116 128
Past service cost (2) 0
Other pension plans [Member] | Change in projected benefit obligation [member] | Wholly or partly funded defined benefit plans [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 1,898  
Defined benefit obligation at end of year 1,858 1,898
Other pension plans [Member] | Change in projected benefit obligation [member] | Wholly unfunded defined benefit plans [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 602  
Defined benefit obligation at end of year 601 602
Other pension plans [Member] | Change in plan assets [member]    
Change in projected benefit obligation [Abstract]    
Defined benefit obligation at beginning of year 2,000 1,816
Net interest cost (income) on net defined benefit liability (asset) (94) (102)
Remeasurement gain (loss) - return on plan assets less interest income (38) 177
Members' contributions 0 0
Employer's contributions 69 56
Benefits paid (161) (149)
Change in foreign currency exchange rate 10 3
Defined benefit administrative expenses (4) (5)
Defined benefit obligation at end of year 2,046 2,000
Net employee benefits expense [Abstract]    
Net interest cost (income) on net defined benefit liability (asset) $ (94) $ (102)