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Income Taxes - Additional Information (Detail)
$ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2024
Apr. 30, 2025
USD ($)
Jan. 31, 2025
CAD ($)
Apr. 30, 2025
Disclosure Of Income Taxes [Line Items]        
Maximum range of estimated consolidated effective tax rate   1.00%   1.00%
2019 Taxation Year [Member]        
Disclosure Of Income Taxes [Line Items]        
Additional income tax by denying the tax deductibility     $ 1,847  
2020 Taxation Year [Member]        
Disclosure Of Income Taxes [Line Items]        
Additional Income Taxes Imposed   $ 71    
Organization For Economic Cooperation And Development Pillar Two Tax Regime [Member]        
Disclosure Of Income Taxes [Line Items]        
Global minimum tax percentage 15.00%