XML 139 R78.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Segment Reporting - Summary of Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of reportable segments [Line Items] |  |  |
Exceptional items excluded from depreciation and amortisation |  | $ 212 |
Exceptional items excluded from impairment losses |  | 5 |
Exceptional items | 566 | 636 | 2,520
Group and unallocated items/eliminations [member] |  |  |
Disclosure of reportable segments [Line Items] |  |  |
Exceptional items | 27 | 51 | 132
Group and unallocated items/eliminations [member] | Samarco dam failure [member] |  |  |
Disclosure of reportable segments [Line Items] |  |  |
Exceptional items | $ (27) | $ (51) | $ (62)

X
- Definition Exceptional item gains (losses) before net finance costs and tax. + References No definition available. + Details
Name: | bhp_ExceptionalItemGainsLossesBeforeNetFinanceCostsAndTax
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Exceptional Items Excluded From Depreciation and Amortization + References No definition available. + Details
Name: | bhp_ExceptionalItemsExcludedFromDepreciationAndAmortization
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Exceptional Items Excluded From Impairment Losses + References No definition available. + Details
Name: | bhp_ExceptionalItemsExcludedFromImpairmentLosses
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_MaterialReconcilingItemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bhp_SignificantEventsAxis=bhp_SamarcoDamFailureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |