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Taxation - Unrecognised deferred tax assets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Jun. 30, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross value of tax losses which has not been recognised $ 724 $ 796
Unrecognised deferred tax assets 187 204
Capital losses – indefinite    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets 123 123
Trading losses – indefinite    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets 31 31
Trading and capital losses – expiry dates up to 2033    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets $ 33 $ 50