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Cash and cash equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract]        
Balance per Group balance sheet $ 9,015 $ 8,495 $ 9,256  
Bank overdrafts repayable on demand (unsecured) (2) (11) (3)  
Balance per Group cash flow statement $ 9,013 $ 8,484 $ 9,253 $ 9,672