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Principal joint operations - Summary of principle joint operations (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Aluminerie De Becancour Inc |  |
Disclosure of joint operations [line items] |  |
Group interest (%) | 25.20% |
Tomago Aluminium Joint Venture |  |
Disclosure of joint operations [line items] |  |
Country of incorporation/operation | Australia |
Company of incorporation/operation | Tomago Aluminium Joint Venture |
Principal activities | Aluminium smelting |
Group interest (%) | 51.55% |
Gladstone Power Station Joint Venture |  |
Disclosure of joint operations [line items] |  |
Country of incorporation/operation | Australia |
Company of incorporation/operation | Gladstone Power Station Joint Venture |
Principal activities | Power generation |
Group interest (%) | 42.13% |
Hope Downs Joint Venture |  |
Disclosure of joint operations [line items] |  |
Country of incorporation/operation | Australia |
Company of incorporation/operation | Hope Downs Joint Venture |
Principal activities | Iron ore mining |
Group interest (%) | 50.00% |
Western Range Joint Venture |  |
Disclosure of joint operations [line items] |  |
Country of incorporation/operation | Australia |
Company of incorporation/operation | Western Range Joint Venture |
Principal activities | Iron ore mining |
Group interest (%) | 54.00% |
Percentage of liabilities recognised, excluding close-down and restoration provision | 54.00% |
Percentage of close-down and restoration provision recognised | 100.00% |
Percentage of receivables recognised | 46.00% |
Queensland Alumina Limited |  |
Disclosure of joint operations [line items] |  |
Country of incorporation/operation | Australia |
Company of incorporation/operation | Queensland Alumina Limited |
Principal activities | Alumina production |
Group interest (%) | 80.00% |
Pilbara Iron Arrangements |  |
Disclosure of joint operations [line items] |  |
Country of incorporation/operation | Australia |
Company of incorporation/operation | Pilbara Iron Arrangements |
Principal activities | Infrastructure, corporate and mining services |
Aluminerie Alouette Inc. |  |
Disclosure of joint operations [line items] |  |
Country of incorporation/operation | Canada |
Company of incorporation/operation | Aluminerie Alouette Inc. |
Group interest (%) | 40.00% |
Pechiney Reynolds Quebec Inc |  |
Disclosure of joint operations [line items] |  |
Country of incorporation/operation | Canada |
Company of incorporation/operation | Pechiney Reynolds Quebec Inc |
Principal activities | Aluminium production |
Group interest (%) | 50.20% |
Pechiney Reynolds Quebec Inc | Aluminerie De Becancour Inc |  |
Disclosure of joint operations [line items] |  |
Principal activities | aluminium smelter |
Group interest (%) | 50.10% |
Company of operation | Aluminerie de Bécancour, Inc. |
New Zealand Aluminium Smelters Limited |  |
Disclosure of joint operations [line items] |  |
Group interest (%) | 80.00% | 79.36%

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