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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, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Proceeds from interest bearing liabilities $ 250 $ 528 $ 1,577
Settlements of debt related instruments (160) (218) 36
Repayment of interest bearing liabilities (2,604) (4,188) (7,114)
Change from Net financing cash flows (2,514) (3,878)  
Bank loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
At the beginning of the financial year 2,555 2,281  
Proceeds from interest bearing liabilities 250 500  
Repayment of interest bearing liabilities (308) (221)  
Change from Net financing cash flows (58) 279  
Other movements:      
Other interest bearing liabilities/derivative related changes 1 (5)  
At the end of the financial year 2,498 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 23,298 27,041  
Repayment of interest bearing liabilities (2,198) (3,736)  
Change from Net financing cash flows (2,198) (3,736)  
Other movements:      
Interest rate impacts 729 (353)  
Foreign exchange impacts (311) 245  
Other interest bearing liabilities/derivative related changes 11 101  
At the end of the financial year 21,529 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 802 897  
Repayment of interest bearing liabilities (75) (81)  
Change from Net financing cash flows (75) (81)  
Other movements:      
Foreign exchange impacts (11) (9)  
Other interest bearing liabilities/derivative related changes (1)    
Liabilities transferred to held for sale   (5)  
At the end of the financial year 715 802 897
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 58 45  
Other movements:      
Other interest bearing liabilities/derivative related changes (38) 13  
At the end of the financial year 20 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 92 210  
Proceeds from interest bearing liabilities   28  
Repayment of interest bearing liabilities (23) (150)  
Change from Net financing cash flows (23) (122)  
Other movements:      
Other interest bearing liabilities/derivative related changes (3) 4  
At the end of the financial year 66 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 805 740  
Settlements of debt related instruments (160) (218)  
Change from Net financing cash flows (160) (218)  
Other movements:      
Interest rate impacts (809) 329  
Foreign exchange impacts 319 (254)  
Other interest bearing liabilities/derivative related changes 49 208  
At the end of the financial year $ 204 $ 805 $ 740