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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

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- Definition Total realised gains or losses related to Level 3 financial assets and liabilities included in net operating costs. + References No definition available. + Details
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