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Contingencies and commitments - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of contingent liabilities [line items]    
Outstanding letters of credit $ 68 $ 55
Total commitments for capital expenditure 10 6
Associates [member]    
Disclosure of contingent liabilities [line items]    
Capital and other commitments $ 3 $ 6