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Employees - Summary of Employees (Parenthetical) (Detail)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Disclosure Of Average Number Of Employees [Abstract]
Percentage of employees of subsidiary companies	100.00%	100.00%	100.00%

X

- Definition

Disclosure of average number of employees.

+ References

No definition available.

+ Details

Name:	bhp_DisclosureOfAverageNumberOfEmployeesAbstract
Namespace Prefix:	bhp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of employees of subsidiary companies included in the the Group employee number.

+ References

No definition available.

+ Details

Name:	bhp_PercentageOfEmployeesOfSubsidiaryCompanies
Namespace Prefix:	bhp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration