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Financial instruments and risk management - Currency risk - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of detailed information about financial instruments [line items]      
Borrowings $ 21,017 $ 19,582 $ 17,107
US dollar | Transaction exposure hedging risk      
Disclosure of detailed information about financial instruments [line items]      
Maximum hedging period (in months) 24 months    
Target hedge ratio 75.00%    
Other Currencies | Transaction exposure hedging risk      
Disclosure of detailed information about financial instruments [line items]      
Maximum hedging period (in months) 18 months    
Net investment hedges(1)      
Disclosure of detailed information about financial instruments [line items]      
Maximum total net investment value at risk to total net asset percentage 20.00%    
Value at risk, loss defining period (in years) 1 year    
Percentage of probability confidence level 95.00%    
Borrowings $ 8,109 12,584  
Net Derivative Financial Liabilities (Assets) $ 3,198 $ 806