XML 186 R205.htm IDEA: XBRL DOCUMENT
v3.20.2

Movement in Capitalised Exploratory Well Costs (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Extractive Industries [Abstract] |  |  |
At the beginning of the year | $ 1,040 | $ 794 | $ 668
Additions to capitalised exploratory well costs pending the determination of proved reserves | 120 | 297 | 186
Capitalised exploratory well costs charged to expense | 0 | (9) | (62)
Capitalised exploratory well costs reclassified to wells, equipment, and facilities based on the determination of proved reserves | (6) | (42) | 2
Sale of suspended wells | (65) | 0 | 0
At the end of the year | $ 1,089 | $ 1,040 | $ 794

X
- Definition Capitalized exploratory sold suspended wells. + References No definition available. + Details
Name: | bhp_CapitalizedExploratorySoldSuspendedWells
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Capitalized exploratory well cost charged to expense. + References No definition available. + Details
Name: | bhp_CapitalizedExploratoryWellCostChargedToExpense1
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Capitalized exploratory well cost. + References No definition available. + Details
Name: | bhp_CapitalizedExploratoryWellCosts
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized exploratory well costs, additions pending determination of proved reserves. + References No definition available. + Details
Name: | bhp_CapitalizedExploratoryWellCostsAdditionsPendingDeterminationOfProvedReserves
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reclassification to wells, facilities, and equipment based on determination of proved reserves. + References No definition available. + Details
Name: | bhp_ReclassificationToWellsFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | srt_ExtractiveIndustriesAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration