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Measurement of financial assets and liabilities - Credit risk (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Financial assets    
Financial assets at amortised cost $ 13,603 $ 12,933
All past due    
Financial assets    
Financial assets at amortised cost 4 9
Accumulated impairment    
Financial assets    
Financial assets at amortised cost $ 0 $ 0