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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, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Opening balance $ 147 $ 131
Currency translation adjustments (1) (2)
Total realised gains/(losses) included in consolidated sales revenue 0 12
Total realised gains/(losses) included in net operating costs (11) (18)
Total unrealised gains included in net operating costs 94 43
Total unrealised gains/(losses) transferred into other comprehensive income through cash flow hedges 9 (1)
Additions to financial assets/(liabilities) 50 29
Disposals/maturity of financial instruments (16) (47)
Closing balance 272 147
Net gains included in the income statement for assets and liabilities held at period end $ 84 $ 31