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Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets $ 1,199 $ 1,353
Input taxes receivable 338 262
Input taxes payable 189 134
Available for sale securities [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets 80 70
Other derivative contracts [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets and liabilities 7
Other derivative contracts [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets and liabilities 213 365
Non-current available for sale shares and other investments [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets 408 344
Non-current available for sale shares and other investments [member] | Available for sale securities [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets 80 70
US Treasury Notes [member] | Financial assets held at fair value through profit or loss [member] | Level 1 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets 108 97
BHP Billiton Foundation [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Investments held which are restricted and not available for general use by the Group $ 343 $ 304