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Income Taxes - Additional Information (Detail) - CAD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Jul. 31, 2024
Feb. 29, 2024
Jan. 31, 2025
Disclosure Of Income Taxes [Line Items]      
Maximum range of estimated consolidated effective tax rate     1.00%
Estimated potential income tax reassessment exposure   $ 76  
2019 Taxation Year [Member]      
Disclosure Of Income Taxes [Line Items]      
Additional income tax by denying the tax deductibility     $ 1,847
Organization For Economic Cooperation And Development Pillar Two Tax Regime [Member]      
Disclosure Of Income Taxes [Line Items]      
Global minimum tax percentage 15.00%