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Financial Risk Management - Summary of Movement of Interest Bearing Liabilities and Related Derivatives (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jul. 01, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Proceeds from interest bearing liabilities $ 514 $ 250 $ 528  
Settlements of debt related instruments (157) (160) (218)  
Repayment of interest bearing liabilities (2,047) (2,604) (4,188)  
Change from Net financing cash flows (1,690) (2,514)    
Other movements:        
Leases recognised on IFRS 16 transition       $ 2,301
Bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
At the beginning of the financial year 2,498 2,555    
Proceeds from interest bearing liabilities 514 250    
Repayment of interest bearing liabilities (522) (308)    
Change from Net financing cash flows (8) (58)    
Other movements:        
Other interest bearing liabilities/derivative related changes 2 1    
At the end of the financial year 2,492 2,498 2,555  
Notes and debentures [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
At the beginning of the financial year 21,529 23,298    
Repayment of interest bearing liabilities (859) (2,198)    
Change from Net financing cash flows (859) (2,198)    
Other movements:        
Interest rate impacts 720 729    
Foreign exchange impacts (354) (311)    
Other interest bearing liabilities/derivative related changes 9 11    
At the end of the financial year 21,045 21,529 23,298  
Lease Liabilities [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
At the beginning of the financial year 715 802    
Repayment of interest bearing liabilities (671) (75)    
Change from Net financing cash flows (671) (75)    
Other movements:        
Foreign exchange impacts (43) (11)    
Leases recognised on IFRS 16 transition 2,301      
Lease additions 436      
Re-measurements of index-linked freight contracts 733      
Other interest bearing liabilities/derivative related changes (28) (1)    
At the end of the financial year 3,443 715 802  
Bank overdraft and short-term borrowings [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
At the beginning of the financial year 20 58    
Change from Net financing cash flows 0      
Other movements:        
Other interest bearing liabilities/derivative related changes (20) (38)    
At the end of the financial year 0 20 58  
Other interest bearing liabilities [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
At the beginning of the financial year 66 92    
Repayment of interest bearing liabilities (5) (23)    
Change from Net financing cash flows 5 (23)    
Other movements:        
Foreign exchange impacts (4)      
Other interest bearing liabilities/derivative related changes 1 (3)    
At the end of the financial year 68 66 92  
Cross currency and interest rate swaps [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
At the beginning of the financial year 204 805    
Settlements of debt related instruments (157) (160)    
Change from Net financing cash flows (157) (160)    
Other movements:        
Interest rate impacts (788) (809)    
Foreign exchange impacts 316 319    
Other interest bearing liabilities/derivative related changes (8) 49    
At the end of the financial year $ (433) $ 204 $ 805