XML 261 R200.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Number of Productive Crude Oil and Natural Gas Wells in which we Held an Interest (Detail) | Jun. 30, 2018 Wells
--- | ---
Productive wells [Line Items] |
Crude oil wells, Gross | 1,411
Crude oil wells, Net | 747
Natural gas wells, Gross | 6,831
Natural gas wells, Net | 2,068
Total, Gross | 8,242
Total, Net | 2,815
Australia [member] |
Productive wells [Line Items] |
Crude oil wells, Gross | 354
Crude oil wells, Net | 178
Natural gas wells, Gross | 135
Natural gas wells, Net | 48
Total, Gross | 489
Total, Net | 226
United States [member] |
Productive wells [Line Items] |
Crude oil wells, Gross | 998
Crude oil wells, Net | 547
Natural gas wells, Gross | 6,660
Natural gas wells, Net | 2,012
Total, Gross | 7,658
Total, Net | 2,559
Other countries [member] |
Productive wells [Line Items] |
Crude oil wells, Gross | 59
Crude oil wells, Net | 22
Natural gas wells, Gross | 36
Natural gas wells, Net | 8
Total, Gross | 95
Total, Net | 30

X
- Definition The total number of producing wells and wells capable of production, in which the entity owns an undivided working interest. + References No definition available. + Details
Name: | bhp_ProductiveWellsNumberOfWellsGross
Namespace Prefix: | bhp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total number of producing wells and wells capable of production, in which the entity owns a fractional working interest. + References No definition available. + Details
Name: | bhp_ProductiveWellsNumberOfWellsNet
Namespace Prefix: | bhp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total number of producing gas wells and gas wells capable of production, in which the entity owns an undivided working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
Name: | us-gaap_ProductiveGasWellsNumberOfWellsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total number of producing gas wells and gas wells capable of production, in which the entity owns a fractional working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
Name: | us-gaap_ProductiveGasWellsNumberOfWellsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
Name: | us-gaap_ProductiveOilWellsNumberOfWellsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total number of producing oil wells and oil wells capable of production, in which the entity owns a fractional working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
Name: | us-gaap_ProductiveOilWellsNumberOfWellsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ProductiveWellsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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: |