v3.24.1.1.u2
Income Taxes (Narrative) (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2024
Apr. 30, 2024
Disclosure Of Income Tax [Line Items]    
Additional Income Tax and Interest reassessed   $ 1,784
Revenu Quebec Agency [member] | 2011 to 2018 taxation years [member]    
Disclosure Of Income Tax [Line Items]    
Additional Income Tax and Interest reassessed   52
Revenu Quebec Agency [member] | 2018 taxation year [member]    
Disclosure Of Income Tax [Line Items]    
Additional Income Tax and Interest reassessed $ 1  
Canada Revenue Agency Reassessment [member] | 2011 to 2018 taxation years [member]    
Disclosure Of Income Tax [Line Items]    
Additional Income Tax and Interest reassessed   1,661
Alberta Tax and Revenue Administration Reassessment [member] | 2011 to 2018 taxation years [member]    
Disclosure Of Income Tax [Line Items]    
Additional Income Tax and Interest reassessed   $ 71