v3.25.4
Deferred Tax - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Undistributed earnings of non-Canadian subsidiaries $ 9,700 $ 12,700
Deferred tax asset 1,343 1,376
Two Thousand Thirty Four To Two Thousand and Forty One [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward. $ 900  
Canada [member] | Tax Legislation [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset   $ 468