v3.22.2.2
Employee benefits - Pension and other post-employment benefits - Analysis of Movement in Financial Position Related to Pension and Other Post-employment Benefit Plans (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]    
Payments $ 607  
Defined benefit pension plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Benefit obligation at beginning of period 15,315  
Opening Fair value of plan assets at beginning of period 17,703  
Closing Benefit obligation at end of period 11,893 $ 15,315
Closing fair value of plan assets at end of period 15,026 17,703
Defined benefit pension plans [member] | Change in fair value of plan assets [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Fair value of plan assets at beginning of period 17,703 [1] 16,024
Interest income 580 [1] 432
Remeasurements: Return on plan assets (excluding interest income) (2,931) [1] 1,614
Change in foreign currency exchange rate (62) [1] (21)
Contributions - Employer 177 [1] 221
Contributions - Plan participant 45 [1] 46
Payments (610) [1] (594)
Payments - amount paid in respect of settlements 3 [1] (2)
Business combinations/Disposals 135 [1] (4)
Other (14) [1] (13)
Closing fair value of plan assets at end of period [1] 15,026 17,703
Defined benefit pension plans [member] | Change in present value of benefit obligation [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Benefit obligation at beginning of period 15,315 [1] 16,351
Current service costs 308 [1] 359
Past service costs [1] (1)  
Gains and losses on settlements (3) [1] 2
Interest expense 496 [1] 439
Remeasurements: Actuarial losses (gains) from demographic assumptions [1] (2)  
Remeasurements: Actuarial losses (gains) from financial assumptions (3,797) [1] (1,253)
Remeasurements: Actuarial losses (gains) from experience adjustments 83 [1] (5)
Change in foreign currency exchange rate (47) [1] (24)
Contributions - Plan participant 45 [1] 46
Payments (610) [1] (594)
Payments - amount paid in respect of settlements 3 [1] (2)
Business combinations/Disposals 103 [1] (4)
Closing Benefit obligation at end of period [1] 11,893 15,315
Defined benefit pension plans [member] | Unfunded Obligation [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Benefit obligation at beginning of period 26  
Closing Benefit obligation at end of period 23 26
Defined benefit pension plans [member] | Wholly or partly funded obligation [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Benefit obligation at beginning of period 15,289  
Closing Benefit obligation at end of period 11,870 15,289
Other post employment benefit [member] | Change in fair value of plan assets [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Fair value of plan assets at beginning of period 0 0
Contributions - Employer 79 75
Contributions - Plan participant 20 19
Payments (99) (94)
Closing fair value of plan assets at end of period   0
Other post employment benefit [member] | Change in present value of benefit obligation [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Benefit obligation at beginning of period 1,780 1,953
Current service costs 42 46
Past service costs 2 (1)
Interest expense 63 57
Remeasurements: Actuarial losses (gains) from demographic assumptions (1) (6)
Remeasurements: Actuarial losses (gains) from financial assumptions (341) (184)
Remeasurements: Actuarial losses (gains) from experience adjustments (9) (2)
Change in foreign currency exchange rate 6 (7)
Contributions - Plan participant 20 19
Payments (99) (94)
Business combinations/Disposals (1) (1)
Closing Benefit obligation at end of period 1,462 1,780
Other post employment benefit [member] | Unfunded Obligation [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Benefit obligation at beginning of period 1,633  
Closing Benefit obligation at end of period 1,462 1,633
Other post employment benefit [member] | Wholly or partly funded obligation [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening Benefit obligation at beginning of period 147  
Closing Benefit obligation at end of period $ 0 $ 147
[1] For pension plans with funding deficits, the benefit obligations and fair value of plan assets as at October 31, 2022 were $323 million and $117 million, respectively (October 31, 2021 – $413 million and $155 million, respectively).