XML 176 R197.htm IDEA: XBRL DOCUMENT
v3.20.2

Costs Incurred Relating to Oil and Gas Property Acquisition, Exploration and Development Activities (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of proved property | $ 0 | $ 0 | $ 0
Acquisitions of unproved property | 44 | 5 | 9
Exploration | 686 | 726 | 734
Development | 1,008 | 978 | 1,777
Total costs | 1,738 | 1,709 | 2,520
Australia [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of proved property | 0 |  |
Acquisitions of unproved property | 0 |  |
Exploration | 38 | 44 | 25
Development | 232 | 132 | 195
Total costs | 270 | 176 | 220
United States [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of proved property | 0 | 0 | 0
Acquisitions of unproved property | 38 | 5 | 9
Exploration | 278 | 190 | 418
Development | 676 | 792 | 1,548
Total costs | 992 | 987 | 1,975
Other countries [member] |  |  |
Costs incurred oil and gas property acquisition exploration and development activities [line items] |  |  |
Acquisitions of proved property | 0 | 0 | 0
Acquisitions of unproved property | 6 |  |
Exploration | 370 | 492 | 291
Development | 100 | 54 | 34
Total costs | $ 476 | $ 546 | $ 325

X
- Definition Costs incurred acquisition of oil and gas properties with proved reserves. + References No definition available. + Details
Name: | bhp_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs incurred acquisition of unproved oil and gas properties. + References No definition available. + Details
Name: | bhp_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs incurred development costs. + References No definition available. + Details
Name: | bhp_CostsIncurredDevelopmentCosts
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs incurred exploration costs. + References No definition available. + Details
Name: | bhp_CostsIncurredExplorationCosts
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs incurred oil and gas property acquisition exploration and development activities. + References No definition available. + Details
Name: | bhp_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs incurred oil and gas property acquisition exploration and development activities. + References No definition available. + Details
Name: | bhp_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesLineItems
Namespace Prefix: | bhp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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: |