v3.26.1
Post employment benefits - Movement in net surplus (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 757 $ 721  
Exchange differences (29) 25  
Disposal of businesses   3  
Reclassification from liabilities held for sale   7  
Income/(charge) before taxation (93) (51) $ (42)
Other comprehensive (loss)/income (65) (12) (81)
Contributions by the group 57 64  
Employee contributions 0 0  
Benefits paid 0 0  
Ending balance 627 757 721
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 8,533 8,417  
Exchange differences (262) 633  
Disposal of businesses   0  
Reclassification from liabilities held for sale   0  
Income/(charge) before taxation 390 381  
Other comprehensive (loss)/income (136) (460)  
Contributions by the group 57 64  
Employee contributions 2 2  
Benefits paid (527) (504)  
Ending balance 8,057 8,533 8,417
Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (7,776) (7,696)  
Exchange differences 233 (608)  
Disposal of businesses   3  
Reclassification from liabilities held for sale   7  
Income/(charge) before taxation (483) (432)  
Other comprehensive (loss)/income 71 448  
Contributions by the group 0 0  
Employee contributions (2) (2)  
Benefits paid 527 504  
Ending balance $ (7,430) $ (7,776) $ (7,696)