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Related undertakings - Summary of joint ventures (Detail) | 12 Months Ended
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Dec. 31, 2017
Bao Hi Ranges Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Bao-HI Ranges Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | Level 18 Central Park, 152-158 St. Georges Terrace, Perth WA 6000, Australia
Percentage of ownership interest exchanged in joint venture | 54.00%
Blair Athol Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Blair Athol Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | 123 Albert Street, Brisbane QLD 4000, Australia
Percentage of ownership interest exchanged in joint venture | 71.20%
Cape Bougainville Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Cape Bougainville Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | 123 Albert Street, Brisbane QLD 4000, Australia
Percentage of ownership interest exchanged in joint venture | 53.80%
Channar Mining Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Channar Mining Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | Level 18 Central Park, 152-158 St. Georges Terrace, Perth WA 6000, Australia
Percentage of ownership interest exchanged in joint venture | 60.00%
Diavik Joint Venture [member] |
Disclosure Of Joint Ventures [Line Items] |
Percentage of ownership interest exchanged in joint venture | 60.00%
Diavik Joint Venture [member] | Canada [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Diavik Joint Venture
Country of incorporation, Joint Venture | Canada
Address of principal place of business | 300-5201 50th Avenue, Yellowknife NT X1A 2P9, Canada
Percentage of ownership interest exchanged in joint venture | 60.00%
Gladstone Power Station Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Gladstone Power Station Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | NRG Gladstone Operating Service, Gladstone Power Station, Gladstone QLD 4680, Australia
Percentage of ownership interest exchanged in joint venture | 42.10%
Grasberg Joint Operation [member] | Indonesia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Grasberg joint operation
Country of incorporation, Joint Venture | Indonesia
Address of principal place of business | JI Mandala Raya Selatan, No. 1 Kuala Kencana, Timika, Irian Jaya, 98663, Indonesia
Percentage of ownership interest exchanged in joint venture | 40.00%
Green Mountain Mining Venture [member] | United States [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Green Mountain Mining Venture
Country of incorporation, Joint Venture | United States
Address of principal place of business | 4700 Daybreak Parkway, South Jordan UT 84009, United States
Percentage of ownership interest exchanged in joint venture | 100.00%
Hail Creek Joint Venture [member] |
Disclosure Of Joint Ventures [Line Items] |
Percentage of ownership interest exchanged in joint venture | 82.00%
Hail Creek Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Hail Creek Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | 123 Albert Street, Brisbane QLD 4000, Australia
Percentage of ownership interest exchanged in joint venture | 82.00%
Hope Downs Joint Venture [member] |
Disclosure Of Joint Ventures [Line Items] |
Percentage of ownership interest exchanged in joint venture | 50.00%
Hope Downs Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Hope Downs Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | Level 18 Central Park, 152-158 St. Georges Terrace, Perth WA 6000, Australia
Percentage of ownership interest exchanged in joint venture | 50.00%
Kestrel Joint Venture [member] |
Disclosure Of Joint Ventures [Line Items] |
Percentage of ownership interest exchanged in joint venture | 80.00%
Kestrel Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Kestrel Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | 123 Albert Street, Brisbane QLD 4000, Australia
Percentage of ownership interest exchanged in joint venture | 80.00%
Mitchell Plateau Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Mitchell Plateau Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | 123 Albert Street, Brisbane QLD 4000, Australia
Percentage of ownership interest exchanged in joint venture | 52.30%
Rhodes Ridge Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Rhodes Ridge Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | Level 18 Central Park, 152-158 St. Georges Terrace, Perth WA 6000, Australia
Percentage of ownership interest exchanged in joint venture | 50.00%
Robe River Iron Associates Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Robe River Iron Associates Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | Level 27,Central Park, 152-158 St. Georges Terrace, Perth WA 6000, Australia
Percentage of ownership interest exchanged in joint venture | 57.10%
Tomago Aluminium Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Tomago Aluminium Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | 638 Tomago Road, NSW 2322, Tomago, Australia
Percentage of ownership interest exchanged in joint venture | 51.60%
Winchester South Joint Venture [member] | Australia [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Winchester South Joint Venture
Country of incorporation, Joint Venture | Australia
Address of principal place of business | 123 Albert Street, Brisbane QLD 4000, Australia
Percentage of ownership interest exchanged in joint venture | 75.00%
Winter Road Joint Venture [member] | Canada [member] |
Disclosure Of Joint Ventures [Line Items] |
Company of operation | Winter Road Joint Venture
Country of incorporation, Joint Venture | Canada
Address of principal place of business | 300-5201 50th Avenue, Yellowknife NT X1A 2P9, Canada
Percentage of ownership interest exchanged in joint venture | 33.30%

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