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Dividends (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Dividends [Abstract] |
Summary of dividends paid |
|  | 2017 |  |  | 2016 |  |  | 2015 |
| US$m |  | US$m |  | US$m |
Rio Tinto plc previous year final dividend paid |  | 1,725 |  |  | 1,443 |  |  | 1,642 |
Rio Tinto plc interim dividend paid |  | 1,530 |  |  | 604 |  |  | 1,476 |
Rio Tinto Limited previous year final dividend paid |  | 523 |  |  | 473 |  |  | 520 |
Rio Tinto Limited interim dividend paid |  | 472 |  |  | 205 |  |  | 438 |
Dividends paid during the year |  | 4,250 |  |  | 2,725 |  |  | 4,076 |
Dividends per share: paid during the year |  | 235.0 | c |  | 152.5 | c |  | 226.5 | c
Dividends per share: proposed in the announcement of the results for the year |  | 180.0 | c |  | 125.0 | c |  | 107.5 | c
Summary of dividends per share |
| Dividends |  | Dividends |  | Dividends |
| per share |  | per share |  | per share |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Rio Tinto plc previous year final (pence) |  | 100.56 | p |  | 74.21 | p |  | 77.98 | p
Rio Tinto plc interim (pence) |  | 83.13 | p |  | 33.80 | p |  | 68.92 | p
Rio Tinto Limited previous year final – fully franked at 30% (Australian cents) |  | 163.62 | c |  | 151.89 | c |  | 152.98 | c
Rio Tinto Limited interim – fully franked at 30% (Australian cents) |  | 137.72 | c |  | 59.13 | c |  | 144.91 | c
Summary of number of shares dividend distributed |
| Number |  | Number |  | Number |
| of shares |  | of shares |  | of shares |
|  | 2017 |  |  | 2016 |  |  | 2015 |
| (millions) |  | (millions) |  | (millions) |
Rio Tinto plc previous year final |  | 1,374.6 |  |  | 1,373.9 |  |  | 1,412.7 |
Rio Tinto plc interim |  | 1,366.1 |  |  | 1,374.4 |  |  | 1,395.2 |
Rio Tinto Limited previous year final |  | 424.0 |  |  | 423.5 |  |  | 435.0 |
Rio Tinto Limited interim |  | 424.0 |  |  | 424.0 |  |  | 423.7 |

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