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Share capital - Rio Tinto plc - Summary of share capital (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) shares | Dec. 31, 2024 £ / shares shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares
Disclosure of classes of share capital [line items] |  |  |  |
Ordinary shares issued | $ | $ 0 |  | $ 0 | $ 0
– Rio Tinto plc |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of issued and fully paid up share capital beginning balance (in shares) | 1,255,892,000 |  | 1,255,845,000 | 1,255,795,000
Issued and fully paid up share capital beginning balance | $ | $ 207 |  | $ 207 | $ 207
Ordinary shares issued under the Global Employee Share plan (GESP) (in shares) | 53,000.000 |  | 47,000.000 | 50,000.000
Shares purchased and cancelled (in shares) | 0 |  | 0 | 0
Shares purchased and cancelled | $ | $ 0 |  | $ 0 | $ 0
Number of shares held by public at beginning balance (in shares) | 1,255,892,000 |  | 1,255,845,000 |
Issued and fully paid up share capital ending balance | $ | $ 207 |  | $ 207 | $ 207
Number of issued and fully paid up share capital ending balance (in shares) | 1,255,945,000 |  | 1,255,892,000 | 1,255,845,000
Number of shares held by public at ending balance (in shares) | 1,255,945,000 |  | 1,255,892,000 | 1,255,845,000
– Rio Tinto plc | Rio Tinto Plc Employee Share Based Payment Plans |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Exercise prices per share | £ / shares |  | £ 45.09 |  |
Market value per share | £ / shares |  | £ 58.99 |  |
– Rio Tinto plc | Shares held by public |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Ordinary shares issued under the Global Employee Share plan (GESP) (in shares) | 53,000.000 |  | 47,000.000 | 50,000.000
Shares purchased and cancelled (in shares) | 0 |  | 0 | 0
Number of shares held by public at beginning balance (in shares) | 1,251,321,000 |  | 1,249,655,000 | 1,248,141,000
Shares reissued from treasury under the GESP (in shares) | 1,548,000 |  | 1,619,000 | 1,464,000
Number of shares held (in shares) | 3,023,000.000 | 3,023,000.000 | 4,571,000 | 6,190,000
Number of shares held by public at ending balance (in shares) | 1,252,922,000 |  | 1,251,321,000 | 1,249,655,000
– Rio Tinto plc | Special voting share |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Other share classes | 1 only |  | 1 only | 1 only
– Rio Tinto plc | DLC dividend share |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Other share classes | 1 only |  | 1 only | 1 only

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