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Equity - Schedule of movements in hedging and exchange reserve (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of reserves within equity [line items]      
Beginning balance [1] $ 11,709 [2] $ 11,511 [2] $ 11,719
Other comprehensive income/(loss) (485) (482) [3] 268 [3]
Equity at end of period 12,070 11,709 [1],[2] 11,511 [1],[2]
Net investment hedges(1) | Interest rate risk      
Disclosure of reserves within equity [line items]      
Cost of hedging reserve 78    
Hedging reserve      
Disclosure of reserves within equity [line items]      
Beginning balance 293 32 150
Other comprehensive income/(loss) (154) 261 (118)
Retranslation impact of opening balances   0 0
Equity at end of period 139 293 32
Exchange reserve      
Disclosure of reserves within equity [line items]      
Beginning balance (3,699) (3,270) (3,368)
Other comprehensive income/(loss) (613) (256) (521)
Retranslation impact of opening balances   (173) 619
Equity at end of period (4,312) (3,699) (3,270)
Hedging and exchange reserve      
Disclosure of reserves within equity [line items]      
Beginning balance (3,406) (3,238) (3,218)
Other comprehensive income/(loss) (767) 5 (639)
Retranslation impact of opening balances   (173) 619
Equity at end of period $ (4,173) $ (3,406) $ (3,238)
[1] (1)  See pages 238-240 for an explanation under Accounting information and policies.
[2] (1)  See pages 238-240 for an explanation under Accounting information and policies.
[3] (1)  See pages 238-240 for an explanation under Accounting information and policies.