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Impact of New Accounting Standards - Summary of Impact of Adopting IFRS 9 on the Equity Attributable to BHP Shareholders (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Jul. 01, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Disclosure of initial application of standards or interpretations [line items]          
Equity $ 55,316   $ 60,670 $ 62,161 $ 62,726
Impact of adopting IFRS 9 [member]          
Disclosure of initial application of standards or interpretations [line items]          
Impairment provision resulting from application of the Expected Credit Loss model $ (7) $ (7)      
Restated balance [member]          
Disclosure of initial application of standards or interpretations [line items]          
Equity   $ 60,663 $ 60,663