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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, 2021
Jun. 30, 2020
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 $ 27 $ 40
Add: Change in fair value of hedging instrument recognised in OCI 604 (221)
Less: Reclassified from reserves to financial expenses - recognised through OCI (585) 208
At the end of the financial year 46 27
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 71 163
Add: Change in fair value of hedging instrument recognised in OCI 863 (315)
Less: Reclassified from reserves to financial expenses - recognised through OCI (792) 223
At the end of the financial year 142 71
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 (21) (49)
Add: Change in fair value of hedging instrument recognised in OCI (259) 94
Less: Reclassified from reserves to financial expenses - recognised through OCI 238 (66)
At the end of the financial year (42) (21)
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 50 114
Add: Change in fair value of hedging instrument recognised in OCI 604 (221)
Less: Reclassified from reserves to financial expenses - recognised through OCI (554) 157
At the end of the financial year 100 50
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 (32) (106)
Less: Reclassified from reserves to financial expenses - recognised through OCI (45) 74
At the end of the financial year (77) (32)
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 9 32
Less: Reclassified from reserves to financial expenses - recognised through OCI 14 (23)
At the end of the financial year 23 9
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 (23) (74)
Less: Reclassified from reserves to financial expenses - recognised through OCI (31) 51
At the end of the financial year $ (54) $ (23)