XML 248 R187.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Capitalised Costs Relating to Oil and Gas Production Activities (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items] |  |  |
Net capitalised costs | $ 21,821 | $ 23,936 | $ 25,389
United States [member] |  |  |
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items] |  |  |
Net capitalised costs | 14,976 | 16,152 | 17,339
United States [member] | Discontinued Operations - Onshore US Cash Generating Units [Member] |  |  |
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items] |  |  |
Net capitalised costs | $ 10,672 | $ 11,803 | $ 12,844

X
- Definition Net amount of capitalized costs relating to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
Name: | us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_CapitalizedCostsRelatingToOilAndGasProducingActivitiesByGeographicAreaLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=bhp_DiscontinuedOperationsOnshoreUSCashGeneratingUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |