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Notes to financial information by business unit (Detail) | 6 Months Ended
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Jun. 30, 2021
Disclosure of operating segments [line items] |
Percentage of capital expenditure in subsidiaries | 100.00%
Hope Downs Joint Venture |
Disclosure of operating segments [line items] |
Proportion of ownership interest in joint venture (as a percent) | 50.00%
Robe river iron associates |
Disclosure of operating segments [line items] |
Proportion of ownership interest in joint venture (as a percent) | 65.00%
Proportion of net beneficial interest | 53.00%
Robe river iron associates | Thirty Percent |
Disclosure of operating segments [line items] |
Net beneficial interest held percentage | 30.00%
Net beneficial interest held percentage as owned subsidiary | 60.00%
Robe river iron associates | Thirty Five Percentage |
Disclosure of operating segments [line items] |
Net beneficial interest held percentage | 35.00%
Net beneficial interest held percentage as owned subsidiary | 100.00%
Diavik |
Disclosure of operating segments [line items] |
Proportion of ownership interest in joint venture (as a percent) | 60.00%
Hamersley |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 100.00%
Oyu Tolgoi | Turquoise Hill Resources Ltd |
Disclosure of operating segments [line items] |
Percentage of share class held in subsidiaries | 50.80%
Oyu Tolgoi | Turquoise Hill Resources Ltd | Oyo Tolgoi Copper-Gold Mine |
Disclosure of operating segments [line items] |
Percentage of share class held in subsidiaries | 66.00%
Simfer Jersey Limited |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 53.00%
Simfer Sa |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 85.00%
Proportion of ownership interests held by non-controlling interests | 45.05%
Rio Tinto Fer Et Titane Inc |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 100.00%
Qit Madagascar Minerals |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 80.00%
Richards Bay Minerals |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 74.00%
Argyle |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 100.00%
Gove Alumina Refinery And Rio Tinto Marine |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 100.00%

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