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Acquisitions and disposals (Detail) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
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Jan. 30, 2025 USD ($) | Dec. 05, 2024 USD ($) | Dec. 02, 2024 USD ($) | Nov. 01, 2024 USD ($) | Jul. 17, 2024 USD ($) | Nov. 30, 2023 USD ($) facility | Aug. 28, 2023 USD ($) | Oct. 17, 2022 USD ($) | Mar. 29, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 22, 2025 USD ($) | Oct. 31, 2024 USD ($) | Oct. 09, 2024 $ / shares | Sep. 30, 2024 | Nov. 08, 2023 USD ($) | Dec. 16, 2022
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  | $ 890 | $ 1,050 |  |  |  |  |  |  |
Impairment charges net of reversals, pre tax |  |  |  |  |  |  |  |  |  |  | $ 561 | 936 | $ 52 |  |  |  |  |  |
Power arrangement, agreement term |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |
Gains/(losses) on consolidation and disposal of interests in businesses |  |  |  |  |  |  |  |  |  |  | $ 1,214 | 0 | (105) |  |  |  |  |  |
Acquisitions, including fair value adjustment for contributed assets |  |  |  |  |  |  |  |  |  |  | 650 |  |  |  |  |  |  |  |
Acquisition of joint venture | [1] |  |  |  |  |  |  |  |  |  | 346 | 834 | 850 |  |  |  |  |  |
Attributable to non-controlling interests |  |  |  |  |  |  |  |  |  |  | 2,719 | 1,755 |  |  |  |  |  |  |
Payments from changes in ownership interests in subsidiaries that do not result in loss of control |  |  |  |  |  |  |  |  |  |  | 591 | 33 | 2,961 |  |  |  |  |  |
Sales of property, plant and equipment and intangible assets |  |  |  |  |  |  |  |  |  |  | 30 | 9 | 0 |  |  |  |  |  |
Proceeds from disposal of exploration and evaluation assets |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 88 | 1 |  |  |  |  |  |
New Zealand Aluminium Smelters Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  |  |  |  |  |  |  |  |  | 80.00% | 79.36% |  |  |  |  |  |  |
Fair value after acquisition |  |  |  |  | $ 386 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains/(losses) on consolidation and disposal of interests in businesses |  |  |  |  | 638 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Post-tax consolidation and disposal of interests in businesses |  |  |  |  | 467 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of share for joint operation exceeding carrying value |  |  |  |  | 290 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of share for joint operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (78) |  |  |  |
Acquisitions, including fair value adjustment for contributed assets |  |  |  |  | 650 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in deferred tax liabilities |  |  |  |  | 171 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill recognised as of acquisition date |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Arcadium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price, per share (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.85 |  |  |
New Zealand Aluminium Smelters Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 20.64% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for sale |  |  |  |  |  |  |  |  | $ 150 |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |
Uranium Energy Corp | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received (in shares) |  |  |  |  |  |  |  |  | $ 70 |  |  |  |  |  |  |  |  |  |
Wyoming Uranium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  | $ 175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lake Macleod |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 247 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
La Granja |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage owned |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |  |
La Granja | First Quantum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  | $ 105 |  |  |  |  |  |  |  |  |  |  |
Proportion of interest sold |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  |
Net consideration |  |  |  |  |  |  |  | $ 104 |  |  |  |  |  |  |  |  |  |  |
Working capital balance in project completion |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Sales of property, plant and equipment and intangible assets |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of exploration and evaluation assets |  |  |  |  |  |  |  | 88 |  |  |  |  |  |  |  |  |  |  |
Gain on fair value of interest retained |  |  |  |  |  |  |  | 85 |  |  |  |  |  |  |  |  |  |  |
Profit relating to interest in undeveloped projects |  |  |  |  |  |  |  | 47 |  |  |  |  |  |  |  |  |  |  |
Remaining gain eliminated against the fair value of the EAU |  |  |  |  |  |  |  | 38 |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain |  |  |  |  |  |  |  | $ 154 |  |  |  |  |  |  |  |  |  |  |
Boyne Smelters Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 14.11% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Boyne Smelters Limited | Ordinary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  |  |  |  |  |  |  | 73.50% |  |  |  |  |  |  |  |
Winning Consortium Simandou Railway Pte. Ltd and Winning Consortium Simandou Ports Pte. Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  |  |  |  |  |  |  | 18.02% |  |  |  |  |  |  |  |
Proportion of ownership interest in associates, percent acquired |  |  |  |  |  | 34.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of joint venture |  |  |  |  |  | $ 313 |  |  |  |  | $ 313 |  |  |  |  |  |  |  |
Rincon Mining Pty Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of property, plant and equipment, classified as investing activities |  |  |  |  |  |  |  |  |  | $ 825 |  |  |  |  |  |  |  |  |
Asset purchase of capitalised exploration and evaluation |  |  |  |  |  |  |  |  |  | $ 822 |  |  |  |  |  |  |  |  |
New Zealand Aluminium Smelters Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in subsidiary (%) |  |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Turquoise Hill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00%
Payments from changes in ownership interests in subsidiaries that do not result in loss of control |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,961 |  |  |  |  |  |
Dampier Salt Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in subsidiary (%) |  |  |  |  |  |  |  |  |  |  | 68.36% |  |  |  |  |  |  |  |
Simfer Jersey Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in subsidiary (%) |  |  |  |  |  |  |  |  |  |  | 53.00% |  |  |  |  |  |  |  |
Acquisition of joint venture |  |  |  |  |  | $ 166 |  |  |  |  |  |  |  |  |  |  |  |  |
Attributable to non-controlling interests |  |  |  |  |  |  |  |  |  |  | $ 1,335 | $ (130) |  |  |  |  |  |  |
Simfer Jersey Limited | Ordinary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in subsidiary (%) |  |  |  |  |  | 53.00% |  |  |  |  | 53.00% |  |  |  |  |  |  |  |
Simfer Jersey Limited | Chalco Iron Ore Holdings Ltd (CIOH) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of joint venture |  |  |  |  |  | $ 147 |  |  |  |  |  |  |  |  |  |  |  |  |
Simfer Jersey Limited | Chalco Iron Ore Holdings Ltd (CIOH) | Ordinary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in subsidiary (%) |  |  |  |  |  | 47.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Arcadium Lithium | Loan Agreement Entered Into |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition, loan amount |  | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |
Mitsubishi Corporation | Boyne Smelters Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.65% |  |
Sumimoto Chemical Company | Boyne Smelters Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 2.46% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Meridian Minera Limitada | Agua De La Falda |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57.74% |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45 |
Corporacion Nacional Del Cobre De Chile | Nuevo Cobre |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.26% |
Attributable to non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33 |
Giampaolo Group | Matalco Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of joint venture |  |  |  |  |  |  | $ 738 |  |  |  |  |  |  |  |  |  |  |  |
Giampaolo Group | Matalco Canada Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture, acquired |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities | facility |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Giampaolo Group | Matalco USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture, acquired |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities | facility |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
[1] | In 2024, our net cash outflow in relation to the Simandou iron ore project was US$1.3 billion. This includes cash outflows of US$1,831 million for purchase of property, plant and equipment, US$313 million as acquisition of associates for WCS Rail and Port, and US$652 million as net funding of equity accounted units for the subsequent funding of that shared infrastructure. We received related cash inflows of US$1,505 million from Chalco Iron Ore Holdings Ltd (CIOH) for cash calls by SimFerJersey Limited, of which US$411 million relates to CIOH’s share of expenditure incurred up until the end of December 2023 to progress critical works.

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