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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, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]      
Proceeds from interest bearing liabilities $ 528 $ 1,577 $ 7,239
Settlements of debt related instruments (218) 36 156
Repayment of interest bearing liabilities (4,188) (7,114) $ (2,781)
Change from Net financing cash flows (3,878)    
Bank loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]      
At the beginning of the financial year 2,281    
Proceeds from interest bearing liabilities 500    
Repayment of interest bearing liabilities (221)    
Change from Net financing cash flows 279    
Other movements:      
Other interest bearing liabilities/derivative related changes (5)    
At the end of the financial year 2,555 2,281  
Notes and debentures [member]      
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]      
At the beginning of the financial year 27,041    
Repayment of interest bearing liabilities (3,736)    
Change from Net financing cash flows (3,736)    
Other movements:      
Interest rate impacts (353)    
Foreign exchange impacts 245    
Other interest bearing liabilities/derivative related changes 101    
At the end of the financial year 23,298 27,041  
Finance leases [member]      
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]      
At the beginning of the financial year 897    
Repayment of interest bearing liabilities (81)    
Change from Net financing cash flows (81)    
Other movements:      
Foreign exchange impacts (9)    
Liabilities transferred to held for sale (5)    
At the end of the financial year 802 897  
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 45    
Other movements:      
Other interest bearing liabilities/derivative related changes 13    
At the end of the financial year 58 45  
Other interest bearing liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]      
At the beginning of the financial year 210    
Proceeds from interest bearing liabilities 28    
Repayment of interest bearing liabilities (150)    
Change from Net financing cash flows (122)    
Other movements:      
Other interest bearing liabilities/derivative related changes 4    
At the end of the financial year 92 210  
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 740    
Settlements of debt related instruments (218)    
Change from Net financing cash flows (218)    
Other movements:      
Interest rate impacts 329    
Foreign exchange impacts (254)    
Other interest bearing liabilities/derivative related changes 208    
At the end of the financial year $ 805 $ 740