XML 305 R217.htm IDEA: XBRL DOCUMENT
v3.21.2

Developed and Undeveloped Acreage (Including Both Leases and Concessions) Held (Detail) a in Thousands | Jun. 30, 2021 a
--- | ---
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 2,675
Developed acreage, Net | 1,005
Undeveloped acreage, Gross | 4,188
Undeveloped acreage, Net | 3,591
Australia [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 2,423
Developed acreage, Net | 897
Undeveloped acreage, Gross | 391
Undeveloped acreage, Net | 148
United States [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 92
Developed acreage, Net | 41
Undeveloped acreage, Gross | 403
Undeveloped acreage, Net | 339
Other countries [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 160
Developed acreage, Net | 67
Undeveloped acreage, Gross | 3,394
Undeveloped acreage, Net | 3,104

X
- Definition Disclosure of oil and gas producing activities. + References No definition available. + Details
Name: | bhp_DisclosureOfOilAndGasProducingActivitiesLineItems
Namespace Prefix: | bhp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area assigned to productive oil and gas wells with working interest ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
Name: | srt_GasAndOilAreaDevelopedGross
Namespace Prefix: | srt_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area assigned to productive oil and gas wells representing summation of fractional ownership working interest to whole. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
Name: | srt_GasAndOilAreaDevelopedNet
Namespace Prefix: | srt_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Leased area with working interest ownership on which oil and gas wells have not been drilled or completed that would permit production of economic quantities of oil and gas. Excludes area of undrilled acreage held by production under terms of lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
Name: | srt_GasAndOilAreaUndevelopedGross
Namespace Prefix: | srt_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Leased area representing summation of fractional ownership working interest to whole on which oil and gas wells have not been drilled or completed that would permit production of economic quantities of oil and gas. Excludes area of undrilled acreage held by production under terms of lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
Name: | srt_GasAndOilAreaUndevelopedNet
Namespace Prefix: | srt_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=country_AU
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=bhp_OtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |