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Employee Benefits (Summary of Amounts Recognized in the Consolidated Balance Sheet) (Details) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of net defined benefit liability (asset) [line items]    
Defined Benefit plan recognized in Other Assets $ 1,111 $ 1,042
Defined Benefit plan recognized in Other Liabilities 1,372 1,380
Net amount recognized (261) (338)
Principal pension plans [Member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined Benefit plan recognized in Other Assets 951 948
Principal post-retirement benefit plan [Member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined Benefit plan recognized in Other Liabilities 405 397
Other defined benefit pension plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined Benefit plan recognized in Other Assets 160 94
Defined Benefit plan recognized in Other Liabilities 599 615
Other employee benefit plans [Member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined Benefit plan recognized in Other Liabilities $ 368 $ 368