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Financial instruments - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) - Level 3 - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Opening balance $ 216 $ 147
Currency translation adjustments 5 (12)
Total realised gains/(losses) included in net operating costs 19 (32)
Total unrealised gains included in net operating costs 172 22
Total unrealised gains transferred into other comprehensive income through cash flow hedges 9 34
Additions to financial assets 47 88
Disposals/maturity of financial instruments (100) (31)
Closing balance 368 216
Net gains included in the income statement for assets and liabilities held at year end $ 158 $ 3