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Movement in Capitalised Exploratory Well Costs (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Extractive Industries [Abstract] |  |  |
At the beginning of the year | $ 1,089 | $ 1,040 | $ 794
Additions to capitalised exploratory well costs pending the determination of proved reserves | 7 | 120 | 297
Capitalised exploratory well costs charged to expense | (66) |  | (9)
Capitalised exploratory well costs reclassified to wells, equipment, and facilities based on the determination of proved reserves |  | (6) | (42)
Sale of suspended wells |  | (65) |
At the end of the year | $ 1,030 | $ 1,089 | $ 1,040

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

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