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Income Tax - Summary of Reconciliation of Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]    
Earnings (loss) before income taxes $ 81 $ (52)
Canadian statutory rate 23.40% 23.50%
Expected income tax provision $ 19 $ (12)
Earnings taxed in foreign jurisdictions 22 2
Change in unrecognized deferred tax asset 15 16
Amounts not deductible (taxable) for tax purposes 7 (7)
Impact of OCED Pillar Two current taxes 3 0
Exchange rate effects on tax basis (16) 17
Impairment of goodwill 0 15
Other (1) 0
Income taxes $ 49 $ 31