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Cash and cash equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]        
Balance per Group balance sheet $ 9,179 $ 6,775 [1] $ 11,412  
Bank overdrafts repayable on demand (unsecured) (5) (1) (3)  
Balance per Group cash flow statement $ 9,174 $ 6,774 $ 11,409 $ 12,805
[1] Comparative information has been restated to reflect the adoption of narrow scope amendments to IAS12 'Income Taxes', refer to note 2 for details.