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Events after the balance sheet date (Details) - USD ($) $ in Millions |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 17, 2024 | Jul. 11, 2024 | Jun. 28, 2024 | Jun. 30, 2024 | Jun. 30, 2023
Entity Information [Line Items] |  |  |  |  |  |
Proceeds from issue of equity to non-controlling interests | [1] |  |  |  | $ 445 | $ 61
Acquisition of equity interest |  |  |  |  | $ 0 | $ 15
Simandou Iron Ore Project |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Proceeds from issue of equity to non-controlling interests |  |  |  | $ 411 |  |
Cash Calls Received after the Balance Sheet Date | Simandou Iron Ore Project |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Proceeds from issue of equity to non-controlling interests |  |  | $ 575 |  |  |
Cash Calls Received after the Balance Sheet Date | Simfer Jersey Limited |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Proceeds from issue of equity to non-controlling interests |  |  | $ 575 |  |  |
Equity Injections After The Balance Sheet Date | Simfer Jersey Limited |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Acquisition of equity interest |  | $ 166 |  |  |  |
Equity Injections After The Balance Sheet Date | Simfer Jersey Limited | Chalco Iron Ore Holdings Ltd |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Acquisition of equity interest |  | 147 |  |  |  |
Purchase of equity interest after the Balance Sheet Date | WCS Ports And Railway Entities |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Acquisition of equity interest |  | $ 313 |  |  |  |
Proportion of ownership interest in associates, percent acquired |  | 34.00% |  |  |  |
Purchase of equity interest after the Balance Sheet Date | Simfer Jersey Limited | Ordinary shares |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 53.00% |  |  |  |
Purchase of equity interest after the Balance Sheet Date | Simfer Jersey Limited | Chalco Iron Ore Holdings Ltd | Ordinary shares |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 47.00% |  |  |  |
[1] | On 28 June 2024, we received a payment of US$411 million from Chalco Iron Ore Holdings Ltd (CIOH) in relation to their share of cash expenditure for the Simandou iron ore project in Guinea incurred up until the end of December 2023 to progress critical works. On 11 July 2024, we received a further US$575 million from CIOH for cash calls by Simfer Jersey to 30 June 2024. Refer to note 12 for further details.

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