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Share capital (Tables) | 6 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Shares Purchases | Details of the BHP Group Limited purchases are shown in the table below:
Half year ended |  | Shares purchased |  |  | Number |  |  | Cost per share |  |  | Total cost US$M |
31 December 2018 |  |  | BHP Group Limited |  |  |  | 265,839,711 |  |  |  | A$27.64 |  |  |  | 5,274 |

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- Definition Disclosure of shares purchases. + References No definition available. + Details
Name: | bhp_DisclosureOfSharesPurchasesExplanatory
Namespace Prefix: | bhp_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Text block [abstract] + References No definition available. + Details
Name: | bhp_TextBlockAbstract
Namespace Prefix: | bhp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration