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Post employment benefits - Schedule of charge before taxation (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]      
Charge before taxation $ (42) $ (37) $ (39)
United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation 5 19 (37)
Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation 3 1 61
United States      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation (35) (38) (42)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation $ (15) $ (19) $ (21)