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Financial Risk Management - Summary of Financial Assets and Liabilities (Parenthetical) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Jun. 30, 2018
Disclosure of detailed information about financial instruments [line items]    
Other financial assets $ 1,122 $ 1,199
Input taxes receivable 395 338
Input taxes payable 123 189
BHP 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 298 343
Financial assets held at fair value through profit or loss [member] | Other derivative contracts [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets and liabilities 202 213
Financial assets held at fair value through profit or loss [member] | Non-current other investments [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 47 47
Financial assets held at fair value through profit or loss [member] | US Treasury Notes [member] | Level 1 [member] | BHP Foundation [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 94 108
Significant financial instruments [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Net asset fair value $ 205 $ 216