v3.25.4
Taxation - Schedule of Taxes on items Recognized in other Comprehensive (loss) income or Directly in Equity (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Income Taxes [Line Items]    
Deferred tax (benefit) expense on cash flow hedges adjustments to equity $ (1) $ 1
Deferred tax expense on fair value adjustments on financial assets 5 2
Deferred tax expense on remeasurement on defined benefit pension plans 20 5
Tax on Cash Flow Hedges [Member]    
Disclosure Of Income Taxes [Line Items]    
Deferred tax (benefit) expense on cash flow hedges adjustments to equity (1) 1
Tax on Equity Instruments [Member]    
Disclosure Of Income Taxes [Line Items]    
Deferred tax expense on fair value adjustments on financial assets 5 2
Tax on Remeasurement of Defined Benefit Plans [Member]    
Disclosure Of Income Taxes [Line Items]    
Deferred tax expense on remeasurement on defined benefit pension plans 20 5
Deferred and share-based compensation [member]    
Disclosure Of Income Taxes [Line Items]    
Deferred tax expense on share-based payments 11 4
Current tax benefit on share-based payments $ (8) $ (12)