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Post employment benefits - Movement in net surplus (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance $ 748 $ 1,410  
Exchange differences (1) 29  
Disposals   5  
Charge before taxation (42) (37) $ (39)
Other comprehensive (loss)/income (81) (780) 834
Contributions by the group 97 121  
Settlements paid 0    
Employee contributions 0 0  
Benefits paid 0 0  
Ending Balance 721 748 1,410
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance 8,624 10,163  
Exchange differences (5) 267  
Disposals   0  
Charge before taxation 383 357  
Other comprehensive (loss)/income (168) (1,722)  
Contributions by the group 97 121  
Settlements paid (43)    
Employee contributions 2 5  
Benefits paid (473) (567)  
Ending Balance 8,417 8,624 10,163
Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance (7,876) (8,753)  
Exchange differences 4 (238)  
Disposals   5  
Charge before taxation (425) (394)  
Other comprehensive (loss)/income 87 942  
Contributions by the group 0 0  
Settlements paid 43    
Employee contributions (2) (5)  
Benefits paid 473 567  
Ending Balance $ (7,696) $ (7,876) $ (8,753)