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Financial instruments and risk management - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Currency translation adjustments $ (83) $ 32
Cash and cash equivalents 8,495 9,673
Equity shares not held for trading 279 181
Fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Equity shares not held for trading 221 157
Held at fair value    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 8,495 9,673
Level 3    
Disclosure of detailed information about financial instruments [line items]    
Opening balance 147 131
Currency translation adjustments (12) (2)
Total realised gains/(losses) included in consolidated sales revenue 0 12
Total realised gains/(losses) included in net operating costs (32) (18)
Total unrealised gains included in net operating costs 22 43
Total unrealised gains/(losses) transferred into other comprehensive income through cash flow hedges 34 (1)
Additions to financial assets 88 29
Disposals/maturity of financial instruments (31) (47)
Closing balance 216 147
Net gains included in the income statement for assets and liabilities held at year end 3 31
Level 3 | Held at fair value    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 0 0
Level 1 | Held at fair value    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents $ 4,893 $ 2,722