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Share capital - Rio Tinto Limited - Summary of share capital (Detail) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) vote shares | Dec. 31, 2023 USD ($) vote shares | Dec. 31, 2022 USD ($) vote shares
Disclosure of classes of share capital [line items] |  |  |
Adjustment on currency translation | $ 193 | $ 47 | $ 42
– Rio Tinto Limited |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of issued and fully paid up share capital beginning balance (in shares) | shares | 371,210 | 371,210 | 371,210
Number of issued and fully paid up share capital ending balance (in shares) | shares | 371,210 | 371,210 | 371,210
Issued and fully paid up share capital beginning balance | $ 3,377 | $ 3,330 | $ 3,570
Adjustment on currency translation | (317) | 47 | (240)
Issued and fully paid up share capital ending balance | $ 3,060 | $ 3,377 | $ 3,330
– Rio Tinto Limited | Special voting share |  |  |
Disclosure of classes of share capital [line items] |  |  |
Rights, Preferences And Restrictions Attaching To Class Of Share Capital, Votes | vote | 1,000,000 | 1,000,000 | 1,000,000
– Rio Tinto Limited | DLC dividend share |  |  |
Disclosure of classes of share capital [line items] |  |  |
Rights, Preferences And Restrictions Attaching To Class Of Share Capital, Votes | vote | 1,000,000 | 1,000,000 | 1,000,000

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