XML 152 R91.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Income Tax Expense - Summary of Factors Affecting Income Tax Expense (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Income tax expense benefits [Line Items] |  |  |
Australian prima facie tax rate | 30.00% | 30.00% | 30.00%
US tax reform [Member] |  |  |
Income tax expense benefits [Line Items] |  |  |
Repatriation tax | $ 797 |  |
Previously unrecognised tax credits | $ 603 |  |

X
- Definition Income tax expense benefits. + References No definition available. + Details
Name: | bhp_IncomeTaxExpenseBenefitsLineItems
Namespace Prefix: | bhp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Effect From Previously Unrecognised Tax Credits + References No definition available. + Details
Name: | bhp_TaxEffectFromPreviouslyUnrecognisedTaxCredits
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Effect From Repatriation Tax + References No definition available. + Details
Name: | bhp_TaxEffectFromRepatriationTax
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ApplicableTaxRate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | bhp_TaxationInformationAxis=bhp_USTaxReformMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |