XML 68 R58.htm IDEA: XBRL DOCUMENT v3.10.0.1

Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Parenthetical) (Detail) - Samarco dam failure [member] - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Disclosure of exceptional items [line items]
Change in estimate	$ (76)	$ (560)
Exchange translation	6	131
Funding provided during the period	(47)
Utilisation of the Samarco dam failure provision	(168)	$ (285)
Continuation of reparatory and compensatory programs [member]
Disclosure of exceptional items [line items]
Utilisation of the Samarco dam failure provision	(164)
Dam Stabilisation and Expert Costs [member]
Disclosure of exceptional items [line items]
Utilisation of the Samarco dam failure provision	$ (4)

X

- Definition

Disclosure of exceptional items.

+ References

No definition available.

+ Details

Name:	bhp_DisclosureOfExceptionalItemsLineItems
Namespace Prefix:	bhp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) in an accounting estimate that has an effect in the current period or is expected to have an effect in future periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 8
-IssueDate 2018-01-01
-Paragraph 39
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=8&date=2018-03-01&anchor=para_39&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_IncreaseDecreaseInAccountingEstimate
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 37
-IssueDate 2018-01-01
-Paragraph 84
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2018-01-01
-Paragraph 84
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_c&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ProvisionUsedOtherProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash outflow for the purchase of interests in investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_16&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	bhp_ExceptionalItemsAxis=bhp_SamarcoDamFailureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=bhp_ContinuationOfReparatoryAndCompensatoryProgramsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=bhp_DamStabilisationAndExportCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: