v3.26.1
Financial Risk Management - Summary of Reconciliation of Components of Equity and Analysis of Movements in Reserves for all Hedges (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]    
At the beginning of the financial year $ (12) $ 20
At the beginning of the financial year (16) 27
At the beginning of the financial year 4 (7)
Add: Change in fair value of hedging instrument recognised in OCI (165) 242
Less: Reclassified from reserves to financial expenses – recognised through OCI 90 (274)
At the end of the financial year (11) 4
At the end of the financial year (76) (16)
At the end of the financial year (87) (12)
Cash flow hedging reserve, gross [member]    
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]    
At the beginning of the financial year (22) 40
Add: Change in fair value of hedging instrument recognised in OCI (215) 330
Less: Reclassified from reserves to financial expenses – recognised through OCI 129 (392)
At the end of the financial year (108) (22)
Cash flow hedging reserve, tax [member]    
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]    
At the beginning of the financial year 6 (13)
Add: Change in fair value of hedging instrument recognised in OCI 65 (99)
Less: Reclassified from reserves to financial expenses – recognised through OCI (39) 118
At the end of the financial year 32 6
Cash flow hedging reserve, net [member]    
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]    
At the beginning of the financial year (16) 27
Add: Change in fair value of hedging instrument recognised in OCI 150 231
Less: Reclassified from reserves to financial expenses – recognised through OCI 90 (274)
At the end of the financial year (76) (16)
Cost of hedging reserve, gross [member]    
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]    
At the beginning of the financial year 6 (10)
Add: Change in fair value of hedging instrument recognised in OCI (22) 16
Less: Reclassified from reserves to financial expenses – recognised through OCI 0 0
At the end of the financial year (16) 6
Cost of hedging reserve, tax [member]    
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]    
At the beginning of the financial year (2) 3
Add: Change in fair value of hedging instrument recognised in OCI 7 (5)
Less: Reclassified from reserves to financial expenses – recognised through OCI 0 0
At the end of the financial year 5 (2)
Cost of hedging reserve, net [member]    
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]    
At the beginning of the financial year 4 (7)
Add: Change in fair value of hedging instrument recognised in OCI (15) 11
Less: Reclassified from reserves to financial expenses – recognised through OCI 0 0
At the end of the financial year $ (11) $ 4