XML 63 R53.htm IDEA: XBRL DOCUMENT
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Share Capital - Summary of Shares Purchases (Detail) - 6 months ended Dec. 31, 2018 $ in Millions | USD ($) shares | $ / shares
--- | --- | ---
Disclosure of classes of share capital [abstract] |  |
Number | shares | 265,839,711 |
Cost per share | $ / shares |  | $ 27.64
Total Cost | $ | $ 5,274 |

X
- Definition Share purchased price per share. + References No definition available. + Details
Name: | bhp_SharePurchasedPricePerShare
Namespace Prefix: | bhp_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Shares purchased and cancelled. + References No definition available. + Details
Name: | bhp_SharesPurchasedAndCancelled
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration