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Investments Accounted for Using the Equity Method - Summary of Ownership Interest in Equity Accounted Investments (Detail) | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Disclosure of significant investments in associates and joint ventures [Line Items] |  |
Reporting date | --06-30 |
Carbones del Cerrejon LLC [member] |  |
Disclosure of significant investments in associates and joint ventures [Line Items] |  |
Country of incorporation | Anguilla |
Principal place of business | Colombia/Ireland |
Principal activity | Coal mining in Colombia |
Reporting date | --12-31 |
Ownership interest | 33.33% | 33.33%
Compania Minera Antamina S.A. [member] |  |
Disclosure of significant investments in associates and joint ventures [Line Items] |  |
Country of incorporation | Peru |
Principal place of business | Peru |
Principal activity | Copper and zinc mining |
Reporting date | --12-31 |
Ownership interest | 33.75% | 33.75%
Samarco Mineracao S.A. [member] |  |
Disclosure of significant investments in associates and joint ventures [Line Items] |  |
Country of incorporation | Brazil |
Principal place of business | Brazil |
Principal activity | Iron ore mining |
Reporting date | --12-31 |
Ownership interest | 50.00% | 50.00%

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