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Principal associates - Summary of principal associates (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018
Mineracao Rio do Norte S.A. [member] |
Disclosure of associates [Line Items] |
Group interest (%), Associate | 12.00%
Halco (Mining) Inc [member] | Compagnie des Bauxites de Guine [member] |
Disclosure of associates [Line Items] |
Indirect interest in associate | 51.00%
Company of operation, Subsidiary | Compagnie des Bauxites de Guinée
Country of incorporation, Subsidiary | Guinea

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