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Net borrowings - Schedule of net borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Borrowings [abstract]        
Borrowings due within one year and bank overdrafts $ (2,496) $ (2,885) $ (2,004)  
Borrowings due after one year (19,224) (18,616) (19,476)  
Fair value of foreign currency forwards and swaps 309 334 406  
Fair value of interest rate hedging instruments (298) (376) (366)  
Lease liabilities (623) (604) (572)  
Gross borrowings (22,332) (22,147) (22,012)  
Cash and cash equivalents 1,656 1,130 1,529  
Net borrowings $ (20,676) $ (21,017) $ (20,483) $ (19,582)