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Leases - Summary of Movements in Lease Liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jul. 01, 2019
Jun. 30, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
At the beginning of the financial year $ 715    
IFRS 16 transition   $ 2,301  
At the end of the financial year 3,443    
Comprising:      
Current liabilities 853   $ 65
Non-current liabilities 2,590   $ 650
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
At the beginning of the financial year 715    
IFRS 16 transition 2,301    
Additions 436    
Remeasurements of index-linked freight contracts 733    
Lease payments (761)    
Foreign exchange movement (43)    
Amortisation of discounting 90    
Transfers and other movements (28)    
At the end of the financial year 3,443    
Comprising:      
Current liabilities 853    
Non-current liabilities $ 2,590