v3.25.4
Taxation - Schedule of Reconciliation of Income Tax Expense Benefit (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]    
Income before tax $ 1,906 $ 2,069
Income before tax multiplied by the standard rate of Canadian corporate tax of 26.5% 505 548
Income taxes recorded at rates different from the Canadian tax rate (176) (239)
Tax expense related to the transfer of certain technology assets 72  
Net non-taxable foreign exchange and other gains and losses (9) 16
Tax expense on changes in statutory intercompany investment values 30 12
Recognition of tax losses that arose in prior years due to changes in statutory intercompany investment values (30) (12)
Provision for uncertain tax positions 3 (9)
Recognition of tax assets that arose in prior years   (468)
Derecognition of tax assets that arose in prior years   3
Impact of changes in tax laws and rates 15 7
Research and development credits (10) (9)
Other adjustments related to prior years 2 17
Pillar Two top-up tax 5 4
Withholding taxes 7 6
Other differences 9 1
Total tax expense (benefit) $ 423 $ (123)