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Taxation (Details) - USD ($)
$ in Millions
6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2024
Disclosure of geographical areas [line items]      
Tax charge $ 699 $ 737  
Corporate tax receivables 235 274 $ 304
Corporate tax liabilities 191 $ 253 136
Provision for tax uncertainties $ 199   $ 209
The tax rate before exceptional items 24.00% 23.40%  
Great Britain      
Disclosure of geographical areas [line items]      
Tax charge $ 100 $ 116  
Foreign      
Disclosure of geographical areas [line items]      
Tax charge $ 599 $ 621