XML 259 R198.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Number of Crude Oil and Natural Gas Wells Drilled and Completed (Detail) - Wells | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of net productive wells and dry wells drilled [Line Items] |  |  |
Net exploratory wells, Productive | 1 | 3 | 1
Net exploratory wells, Dry | 1 | 2 |
Net exploratory wells, Total | 2 | 5 | 1
Net development wells, Productive | 85 | 81 | 140
Net development wells, Dry | 1 |  | 2
Net development wells, Total | 86 | 81 | 142
Total | 88 | 86 | 143
Australia [member] |  |  |
Disclosure of net productive wells and dry wells drilled [Line Items] |  |  |
Net development wells, Productive | 1 |  | 2
Net development wells, Total | 1 |  | 2
Total | 1 |  | 2
United States [member] |  |  |
Disclosure of net productive wells and dry wells drilled [Line Items] |  |  |
Net exploratory wells, Productive | 1 |  | 1
Net exploratory wells, Dry | 1 |  |
Net exploratory wells, Total | 2 |  | 1
Net development wells, Productive | 84 | 80 | 137
Net development wells, Dry | 1 |  | 2
Net development wells, Total | 85 | 80 | 139
Total | 87 | 80 | 140
Other countries [member] |  |  |
Disclosure of net productive wells and dry wells drilled [Line Items] |  |  |
Net exploratory wells, Productive |  | 3 |
Net exploratory wells, Dry |  | 2 |
Net exploratory wells, Total |  | 5 |
Net development wells, Productive |  | 1 | 1
Net development wells, Total |  | 1 | 1
Total |  | 6 | 1

X
- Definition The number of developmental wells drilled and completed in the geographic area. + References No definition available. + Details
Name: | bhp_DevelopmentWellsDrilledNet
Namespace Prefix: | bhp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of net productive wells and dry wells drilled during the period. + References No definition available. + Details
Name: | bhp_DisclosureOfNetProductiveWellsAndDryWellsDrilledLineItems
Namespace Prefix: | bhp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of exploratory and developmental wells drilled and completed in the geographic area. + References No definition available. + Details
Name: | bhp_ExploratoryAndDevelopmentWellsDrilledNet
Namespace Prefix: | bhp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of exploratory wells drilled and completed in the geographic area. + References No definition available. + Details
Name: | bhp_ExploratoryWellsDrilledNet
Namespace Prefix: | bhp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of nonproductive development wells (dry wells) drilled in the geographic area. A dry well (hole) is a well found to be incapable of producing either oil or gas in sufficient quantities to justify completion as an oil or gas well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1205 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_DevelopmentWellsDrilledNetNonproductive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of productive developmental wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1205 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_DevelopmentWellsDrilledNetProductive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of nonproductive exploratory wells (dry wells) drilled in the geographic area. A dry well (hole) is a well found to be incapable of producing either oil or gas in sufficient quantities to justify completion as an oil or gas well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1205 -Paragraph (a) -Subparagraph (1) + Details
Name: | us-gaap_ExploratoryWellsDrilledNetNonproductive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of productive exploratory wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1205 -Paragraph (a) -Subparagraph (1) + Details
Name: | us-gaap_ExploratoryWellsDrilledNetProductive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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

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